Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
  • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
  • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
  • C08G73/1003—Preparatory processes
  • C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
  • C08G73/101—Preparatory processes from tetracarboxylic acids or derivatives and diamines containing chain terminating or branching agents
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
  • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
  • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
  • C08G63/16—Dicarboxylic acids and dihydroxy compounds
  • C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
  • C08G63/21—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups in the presence of unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
  • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
  • C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Definitions

• the present disclosure relates generally to difunctional end-capped oligomers, and more particularly to oligomers with di-phenylethynyl endcaps.
• thermosetting resins that are commonly used today in fiber-reinforced composites generally can be used in high-temperature applications. These high- temperature thermosetting resins are undesirable in many applications because they often form brittle composites that have relatively low thermal stabilities.
• PMR- 15 prepregs suffer significant processing limitations that hinder their adoption because the prepreg has a mixture of the unreacted monomer reactants on the fiber-reinforcing fabric, making them sensitive to changes in temperature, moisture, and other storage conditions, which cause the prepregs to be at different stages of cure. Aging these PMR prepregs even in controlled environments can lead to problems. The reactants on the prepreg are slowed in their reaction by keeping them cold, but the quality of the prepreg depends on its absolute age and on its prior storage and handling history. And, the quality of the composite is directly proportional to the quality of the prepregs.
• the PMR monomers may be toxic or hazardous (especially methylendianiline or MDA in PMR- 15), presenting health and safety concerns for the workforce. Achieving complete formation of stable imide rings in the PMR composites remains an issue. These and other problems plague PMR- 15 composites.
• AVIMID-N and AVIMID-KIII (trademarks of E. I. duPont de Nemours) resins and prepregs differ from PMR- 15 because they do not include aliphatic chain terminators which PMR- 15 uses to control molecular weight and to retain solubility of the PMR- 15 intermediates during consolidation and cure. Lacking the chain terminators, the AVIMIDs can chain-extend to appreciable molecular weights. To achieve these molecular weights, however, the AVIMIDs (and their LaRC cousins) rely on the melting of crystalline powders to retain solubility or, at least, to permit processing. It has proven difficult to use the AVIMIDs in aerospace parts because of their crystalline melt intermediate stage.
• an oligomer having di-phenylethynyl endcaps is provided.
• the capped oligomer has the formula:
• D is a di-phenylethynyl endcap
• A is an oligomer selected from the group consisting of imidesulfone; ether; ethersulfone; amide; imide; ester; estersulfone; etherimide; amideimide; oxazole; oxazole sulfone; thiazole; thiazole sulfone; imidazole; and imidazole sulfone.
• an advanced composite blend in another aspect, includes a di-phenylethynyl capped oligomer having the formula:
• D is a di-phenylethynyl endcap
• A is an oligomer selected from the group consisting of imidesulfone; ether; ethersulfone; amide; imide; ester; estersulfone; etherimide; amideimide; oxazole; oxazole sulfone; thiazole; thiazole sulfone; imidazole; and imidazole sulfone.
• the composite blend also includes at least one polymer from a different chemical family than the oligomer. DETAILED DESCRIPTION OF THE DISCLOSURE
• Di-phenylethynyl endcapped oligomers for use in high-temperature polymer-matrix composites are disclosed below in detail.
• Di-phenylethynyl endcaps provide composites with significantly higher mechanical properties and increased stability, than known mono-functional endcaps.
• Di-phenylethynyl endcaps can have amine, anhydride, hydroxy, or acid chloride functionality to react with backbones of various different functionalities. For example, amine-functional endcaps can react with anhydride-functional backbones; acid chloride-functional endcaps can react with amine-functional backbones; etc.
• Endcaps can be made from several routes, including, for example, starting with brominated compounds as bromines that are reacted with phenylacetylene, using palladium-based catalysts, to replace the bromines with phenylethynyl moieties.
• blends are used for tailoring the mechanical properties of composites while retaining ease of processing.
• Advanced composite blends can be mixed chemical blends of a linear or multi-dimensional crosslinking oligomer(s) of one chemical family, such as a heterocycle, and corresponding linear or multidimensional polymer(s), unable to crosslink, from a different chemical family, such as ethersulfone.
• the polymer has an average formula weight that is initially higher than that of the oligomer, but the formula weight of the oligomeric portion of the blend will increase appreciably during curing through addition (i.e. homo-) polymerization between the crosslinking functionalities.
• the ratio of oligomer(s) to polymer(s) can be varied to achieve the desired combination of physical properties. Usually the ratio is such that the addition polymer formed during curing constitutes no more than about 50 mol % of the composite. While two component blends are predominately described below, the blends can be more complex mixtures of oligomers or polymers with coreactants, if desired. The blends may even include coreactive oligomers.
• oligomer is meant any molecular weight moiety that includes crosslinking functionalities at its ends to allow it to react to increase the effective molecular weight when the oligomer cures to form a composite.
• polymer is meant any resin that does not include the crosslinking functionalities of the oligomers.
• Advanced composite (mixed chemical) blends of the exemplary embodiment include a mixture of a crosslinking oligomer from one chemical family, generally selected from the group consisting of: imidesulfone; ether; ethersulfone; amide; imide; ester; estersulfone; etherimide; amideimide; oxazole; oxazole sulfone; thiazole; thiazole sulfone; imidazole; and imidazole sulfone, and a noncrosslinking polymer from a different chemical family that act as a toughening agent, plasticizer, and the like.
• a crosslinking oligomer from one chemical family generally selected from the group consisting of: imidesulfone; ether; ethersulfone; amide; imide; ester; estersulfone; etherimide; amideimide; oxazole; oxazole sulfone; thiazole; thiazo
• Coreactants may be included in the blends, or they may comprise mixtures of three or more oligomers/polymers. Because the oligomer's average formula weight will appreciably increase upon curing, generally the average formula weight of the polymer in the uncured blend will be greater than that of the oligomer. For example, a linear oligomer may have an average formula weight of about 500-5000 while the corresponding polymer has an average formula weight of about 20,000-40,000. Upon curing, the oligomer and polymer will generally have average formula weights that are closer because of addition polymerization of the oligomer. Therefore, the problems sometimes encountered with blends having components of widely different average formula weight are not as pronounced in composites formed from the advanced composite blends.
• Advanced composite blends allow tailoring of the properties of high performance composites. They allow averaging of the properties of resins from different families to provide composites that do not have as severe shortcomings as the pure compounds.
• the rigid nature of heterocycles oxazole, thiazole, or imidazole
• the resulting composite will have a use temperature (thermo-oxidative stability) higher than pure ethersulfone and a flexibility greater than the pure heterocycle. Accordingly, the resulting composites have a blending or averaging of physical properties, which makes them candidates for particularly harsh conditions.
• Suitable oligomer/polymer combinations include, but are not limited to: amideimide/imide; amideimide/imidesulfone; amideimide/heterocycle; amideimide/heterocycle sulfone; imide/heterocycle; imidesulfone/heterocycle; imide/heterocycle sulfone; imide/amide; imidesulfone/amide; ester/amide; estersulfone/amide; ester/imide; ester/imidesulfone; estersulfone/imide; or estersulfone/imidesulfone.
• the oligomer can be either component in the mixture.
• Linear oligomers have the general formula:
• A a hydrocarbon residue, from one of the families previously described above and having an aromatic, aliphatic, or aromatic and aliphatic backbone; and D is selected from the group consisting of:
• Ri amine, hydroxyl, acid chloride, or anhydride, where Ri is the point of attachment to A.
• the backbone A in this circumstance, is generally individually selected from the group consisting of: imidesulfones; ethersulfones; amides; ethers; esters; estersulfones; imides; etherimides; amideimides; oxazoles; thiazoles; imidazoles, or heterocycle (i.e. oxazole, thiazole imidazole) sulfones; and generally include only aromatic (typically phenyl) radicals between linkages, although they may have other aromatic, aliphatic, or aromatic and aliphatic radicals.
• aromatic radicals in the backbones may also include nonreactive substituents in some cases, such as aryl, lower alkyl, or lower alkoxy.
• Oligomers of the general formula D — A — D are prepared by reacting suitable endcap monomers with the monomer reactants (polymer precursors) that are commonly used to form the desired backbones.
• the di-phenylethynyl endcap monomers can be prepared, in one embodiment, by starting with brominated compounds as bromines, which are reacted with phenyl acetylene using palladium-based catalysts to replace the bromines with phenylethynyls.
• di-phenylethynyl endcap monomers can be prepared by the following reaction scheme:
• R alkyl, aryl, e.g. CH 3 , and phenyl;
• G - SO 2 - , - S - , - O - , - CH 2 - , - CO - , - SO - , C 3 F 6 , or NHCO.
• Ri amine, hydroxyl, acid chloride, or anhydride.
• Suitable palladium catalyst to be used for displacement of a halogen atom from an organic moiety with an acetylinic moiety include, but are not limited to: Pd/(PPh 3 ) 2 ; PdCl 2 /(PPh 3 ) 2 ; PdCl 2 /CuCl 2 /L 1 Cl; Pd(OAc) 2 /PPh 3 /Et 3 N; Pd/(PPh 3 ) 4 .
• palladium-on-carbon 5% Pd/C); (30% Pd/C) or palladium black (pure Pd) can be used.
• PdO or Pd(OAc) 2 /benzimidazolium salts can be used.
• the palladium catalyst for example, Pd/(PPh 3 ) 2 or PdCl 2 /(PPh 3 ) 2
• a base for example, triethyethylamine, a Cu(I) salt
• a solvent for example, a polar solvent, for example, tetrahydrofuran.
• the acetylene arylation reaction is run in an inert atmosphere at atmospheric pressure at a temperature of 65-85°C for varying lengths of time, ranging from 6-48 hours, depending on the particular aryl bromide used in the reaction.
• the time and temperature required is dependent on the nature and position of other substituents on the aromatic nucleus of the aryl bromide.
• Triethylamine serves as both a solvent and scavenger for the hydrogen bromide generated during the reaction.
• Other useful amines which can be used in place of triethylamine are, for example, diethylamine, butylamines, pyridine and the like.
• a co-solvent such as toluene, xylene, dimethylformamide, or dimethylacetamide can also be used to improve the solubility of the reactants and/or product.
• the reaction requires the presence of a homogenous palladium catalyst which, for example, can be bis (triphenylphosphine) palladium (II) chloride or tetrakis (triphenylphosphine) palladium (O).
• a homogenous palladium catalyst which, for example, can be bis (triphenylphosphine) palladium (II) chloride or tetrakis (triphenylphosphine) palladium (O).
• a homogenous palladium catalyst which, for example, can be bis (triphenylphosphine) palladium (II) chloride or tetrakis (triphenylphosphine) palladium (O).
• an excess of the phosphine ligand is used.
• Suitable co-catalysts include cuprous salts, for example, cuprous chloride, cuprous bromide, and cuprous iodide which is preferred.
• the reaction is monitored by gas or thin-layer chromatography, monitoring the disappearance of reactants and/or appearance of product.
• cuprous salts for example, cuprous chloride, cuprous bromide, and cuprous iodide which is preferred.
• the reaction is monitored by gas or thin-layer chromatography, monitoring the disappearance of reactants and/or appearance of product.
• the following example which includes the best mode of preparing the compounds which is representative of the many phenylethynyl compounds which are used as end-capping reactants will more fully illustrate the embodiments of this invention.
• cuprous iodide 0.15g (0.79 mmol) of cuprous iodide. The system is brought to mild reflux and maintained at that temperature overnight.
• Formulations based on the above endcaps can be formed by reacting, for example, amine functional di-phenylethynyl endcaps with 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) or 2,2'-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA);or hydroxyl (OH) functional di-phenylethynyl endcaps with 4,4'-dichlorodiphenyl sulfone or 4,4',dichlorodiphenyl hexafluoropropane; or acid chloride functional di-phenylethynyl endcaps with 4,4'-methylene dianiline (MDA), 3,4'-oxydianiline (ODA), or 1,3-diamino-2,4,5,6- tetrafluorobenzene (DTFBA).
• BTDA 3,3',4,4'-benz
• molecular weights of the oligomers with di-phenylethynyl endcaps are in the range of about 500 to about 5000, and in another embodiment, of about 1000 to about 1500 are used.
• Amideimides are characterized by backbones of two general types, namely:
• linear polyamideimides include oligomers of the general formula:
• Y a di-phenylethnyl endcap residue as described above;
• R 2 a trivalent organic radical, for example, phenyl
• R 3 an aromatic, aliphatic, or alicyclic radical, for example, a phenoxyphenyl sulfone.
• R 4 a divalent organic radical
• m a small integer, usually from 0-5, but generally sufficiently large to impart thermoplastic properties in the oligomer
• ⁇ phenyl
• the amideimides are generally made by condensing suitable endcap monomers, diacid halides, diamines, and dianhydrides.
• the dianhydrides can be prepared by condensing 2 moles of an acid halide anhydride of the formula:
• R 2 is defined above and X is a halogen
• diamine of the formula: H 2 N — R 3 — NH 2 .
• the diamine in this case, can be selected from any of the following diamines.
• isomers other than the para diamines shown below may be used, for example 1,3; 3,3'; and 3,4.
• diamines that may be used, including those described in U.S. Pat. Nos. 4,504,632; 4,058,505; 4,576,857; 4,251,417; and 4,215,418, the entire contents of which are incorporated herein by reference for all relevant and consistent purposes.
• the aryl or polyaryl "sulfone" diamines previously described can be used, because these diamines are soluble in conventional synthetic solvents and provide high thermal stability to the resulting oligomers and composites.
• Ethersulfone (i.e. phenoxyphenyl sulfone) diamines are those in which
• phenoxyphenyl sulfone diamines include:
• the molecular weights of these diamines varies from about 500 to about 2000. Using lower molecular weight diamines seems to enhance the mechanical properties of the difunctional polyamideimide oligomers, each of which has alternating ether "sulfone" segments in the backbone .
• Phenoxyphenyl sulfone diamines of this general nature can be prepared by reacting two moles of aminophenol with (n+1) moles of an aryl radical having terminal, reactive halo- functional groups (dihalogens), such as 4,4'-dichlorodiphenylsulfone, and a suitable bisphenol (i.e., dialcohol, dihydric phenol, or diol).
• a suitable bisphenol i.e., dialcohol, dihydric phenol, or diol.
• the bisphenol is selected from the group consisting of:
• 2,2-bis-(4-hydroxyphenyl)-propane i.e., bisphenol- A
• bis-(2-hydroxyphenyl)-methane bis-(4-hydroxyphenyl)-methane
• 1 , 1 -bis-(4-hydroxyphenyl)-ethane bisphenol- A
• 2,2-bis-(3-bromo-4-hydroxyphenyl)-propane 2,2-bis-(3-bromo-4-hydroxyphenyl)-propane; or mixtures thereof.
• Bisphenols having aromatic character i.e., absence of aliphatic segments
• such as bisphenol-A are used in one embodiment.
• dihalogens in this circumstance are selected from the group consisting of:
• X halogen
• q -SO 2 -, -S-, —CO—, or — (CF 3 ) 2 C-.
• the condensation reaction creates ether diamines that ordinarily include intermediate "sulfone" linkages.
• the condensation generally occurs through a phenate mechanism in the presence of K 2 CO 3 or another base in a DMSO/toluene solvent.
• the diacid halide or dicarboxylic acid may include an aromatic chain segment selected from the group consisting of:
• R is selected from the group consisting of: phenyl; biphenyl; naphthyl; or a divalent radical of the general formula:
• R 1 a C 2 to C 12 divalent aliphatic, alicyclic, or aromatic radical, for example, phenyl.
• Thiazole, oxazole, or imidazole linkages, especially between aryl groups, may also be used as the conductive linkages to form the conductive or semiconductive oligomers.
• the diacid halides include:
• Schiff base dicarboxylic acids and diacid halides can be prepared by the condensation of aldehydes and aminobenzoic acid (or other amine acids) in the general reaction scheme:
• Polyaryl or aryl diacid halides can achieve the high thermal stabilities in the resulting oligomers and composites insofar as aliphatic bonds are not as thermally stable as aromatic bonds.
• compounds can include intermediate electronegative (i.e., "sulfone") linkages, for example, — SO 2 — , — S — , — CO — , and — (CF 3 ) 2 C — linkages, to improve toughness of the resulting oligomers.
• dicarboxylic acids rather than dianhydrides. These dicarboxylic acids (or their diacid halides) can be used with the diamines previously described.
• Dianhydrides useful for the synthesis of amideimides also include:
• MCTC 5-(2,5-diketotetrahydrofuryl)-3-methylcyclohexene-1,2-dicarboxylic anhydride
• MCTC may be any aromatic or aliphatic dianhydride, such as those disclosed in U.S. Pat. Nos. 3,933,862; 4,504,632; 4,577,034; 4,197,397; 4,251,417; 4,251,418; or 4,251,420, the entire contents of which are incorporated herein by reference for all relevant and consistent purposes. Mixtures of dianhydrides can be used.
• the dianhydrides can also include those intermediates resulting from the condensation of the acid halide anhydride with any of the diamines previously described.
• the dicarboxylic acids and diacid halides include those intermediates prepared by the condensation of the acid anhydride with any of the diamines previously described. The corresponding dicarboxylic acid is converted to the diacid halide (i.e. chloride) in the presence of SOCl 2 (i.e. thionyl chloride).
• Amideimides can be synthesized by several schemes, as previously described. To obtain repeating units of the general formula:
• the acid halide anhydride will react with the diamine to form an intermediate dianhydride which will condense with the diamine and amine-functional endcap.
• the reaction may be carried out in two distinct stages under which the dianhydride is first prepared by mixing substantially stoichiometric amounts (or excess diamine) of the acid halide anhydride and diamine followed by the addition of a mixture of more diamine and the endcap.
• the diamine used to form the dianhydride may differ from that used in the second stage of the reaction, or it may be a mixture of diamines from the outset.
• reaction can be synthesized by reacting the acid anhydride with the diamine to form intermediate dicarboxylic acids, which can then react with more diamine or an amine-functional endcap to complete the oligomer.
• the reaction can be separated into steps.
• the amideimide oligomers (as with all oligomers) appear to possess greater solvent resistance if the condensation of the dianhydride/dicarboxylic acid with the diamine and endcap is done simultaneously rather than sequentially.
• reaction mixture generally comprises the acid halide anhydride or the acid anhydride, the endcap, and the diamine and the synthesis is completed generally in one step.
• reactions are typically conducted under an inert atmosphere and at elevated temperatures, if the reaction rate needs to be increased.
• the reaction mixture should be well stirred throughout the synthesis. Chilling the reaction mixture can slow the reaction rate and can assist in controlling the oligomeric product.
• the diamine can be in the form of its precursor
• n is a small integer, usually 1 to 4.
• ⁇ phenyl
• G - SO 2 - , - S - , - O - , - CH 2 - , - CO - , - SO - , C 3 F 6 , or NHCO;
• R a trivalent C (6-13 ) aromatic organic radical
• R 1 amide, imide, or sulfone
• R a divalent C (6-30 ) aromatic organic radical.
• the polyetherimide oligomers can be prepared by several reaction schemes.
• One such method comprises the simultaneous condensation of:
• the polyetherimides can be prepared by reacting a polyetherimide polymer made by the self-condensation of a phthalimide salt derivative of the formula:
• G - SO 2 - , - S - , - O - , - CH 2 - , - CO - , - SO - , C 3 F 6 , or NHCO;
• R' a divalent C (6-30 ) aromatic organic radical;
• M an alkali metal ion or ammonium salt.
• the self-condensation proceeds as described in U.S. Pat. No. 4,297,474 in a dipolar aprotic solvent.
• the endcap moieties can be introduced during the self-condensation to quench the polymerization, or they might be added following completion of the polymerization and recovery of the polyetherimide polymer from methanol. Improved solvent resistance in the cured composites is best achieved, however, by the quenching sequence rather than by the capping sequence which follows polymerization.
• Another method for synthesizing polyetherimides involves the simultaneous condensation of about 2m+2 moles of nitrophthalic anhydride with about m+1 moles of diamine, about m moles of dialcohol (i.e., bisphenol, diol, or dihydric phenol), and 2 moles of Ai, having — OH functionality, in a suitable solvent under an inert atmosphere.
• dialcohol i.e., bisphenol, diol, or dihydric phenol
• Ai having — OH functionality
• the diamines (which can have aromatic ethersulfone backbones) react with the anhydride to form intermediates of the following nature in the backbone:
• Another synthesis includes the simultaneous condensation of about 2m+2 moles of nitrophthalic anhydride with about m+1 moles of dialcohol, m moles of diamine, and 2 moles A 1 , having — NH 2 functionality, in a suitable solvent under an inert atmosphere.
• the dialcohol may be in the phenate form.
• the resulting oligomer has a general formula:
• Another synthesis includes the simultaneous condensation of 2 m moles of nitrophthalic anhydride with about m+1 moles of dialcohol, m moles of diamine, and 2 moles of Ai, having — NO 2 functionality, in a suitable solvent under an inert atmosphere.
• the dialcohol may be in the phenate form or a corresponding sulfhydryl (thio) can be used to form a thioether.
• the resulting oligomer has the general formula:
• dialcohol can be replaced by a comparable disulfhydryl of the formula: HS — R 2 — SH. Mixtures of dialcohols, or disulfhydryls can be used.
• the dialcohol is generally a polyaryl compound and preferably is selected from the group consisting of:
• L -CH 2 - , -(CH 3 ) 2 C- , -(CF 3 ) 2 C- , — O— , — S— , -SO 2 - , or —CO— ;
• the dialcohols also include hydroquinone; bisphenol-A; p,p'-biphenol;
• R is selected from the group consisting of: phenyl; biphenyl; naphthyl; or a radical of the general formula:
• W — CH 2 — or — SO 2 — ; or a dialcohol selected from the group:
• D any of- CO - , - SO 2 - , or - (CF 3 ) 2 C - .
• dialcohols may also be selected from those described in U.S. Pat. Nos. 4,584,364; 3,262,914; or 4,611,048.
• the hydroxy-terminated etherimides of U.S. Pat. No. 4,611,048 can be reacted with A 1 , having — NO 2 functionality, to provide crosslinking etherimides of the present invention.
• Dialcohols of this nature are commercially available. Some may be easily synthesized by reacting halide intermediates with bis-phenates, such as by the reaction of 4,4'-dichlorodiphenylsulfone with bis(disodium biphenolate).
• the oligomers can be synthesized in a homogeneous reaction scheme wherein all the reactants are mixed at one time (and this scheme is preferred), or in a stepwise reaction.
• the diamine and dialcohols can be mixed, for example, followed by addition of the nitrophthalic anhydride to initiate the polymerization and thereafter the endcaps to quench it.
• nitrophthalic anhydride to initiate the polymerization and thereafter the endcaps to quench it.
• undesirable competitive reactions should be minimized by controlling the reaction steps (i.e., addition of reactants) and the reaction conditions.
• Suitable diamines include those diamines described with reference to the amideimide synthesis.
• R a trivalent C (6-13 ) aromatic organic radical
• G - SO 2 - , - S - , - O - , - CH 2 - , - CO - , - SO - , C 3 F 6 , or NHCO;
• etherimides are useful in the synthesis of etherimides, and are prepared by the condensation of the corresponding endcap phenol or thiol (--XH) with a nitro- or halo- anhydride that contains the R moiety.
• R a trivalent C (6-13) aromatic organic radical
• ⁇ phenyl
• G - SO 2 - , - S - , - O - , - CH 2 - , - CO - , - SO - , C 3 F 6 , or NHCO;
• This intermediate is formed by reacting A 1 , having — NH 2 functionality, with a substituted phthalic anhydride of the formula:
• Polysulfoneimide oligomers corresponding to the etherimides can be prepared by reacting about m+1 moles of a dianhydride with about m moles of a diamine and about 2 moles of an amine functional endcap (A 1 — NH 2 ).
• the resulting oligomer has the general formula:
• R and R' are divalent aromatic organic radicals having from 6-20 carbon atoms.
• R and R may include halogenated aromatic C(6 -20 ) hydrocarbon derivatives; alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms; Q 2-8) alkylene terminated polydiorganosiloxanes; and radicals of the formula:
• XX' aliphatic, aromatic, or hydrogen.
• a multidimensional oligomer includes an aromatic hub and three or more radiating chains or arms, each chain terminating with a crosslmking end cap segment. Each chain includes the resin linkages previously described. Each chain is substantially the same.
• a multidimensional ether can be prepared by the simultaneous condensation of phloroglucinol with a dihalogen and an end cap monomer.
• the higher density of crosslinking functionalities in a multidimensional array provides increased thermo-oxidative stability to the cured composites.
• the hub will have three radiating chains to form a "Y" pattern. In some cases, four chains may be used. Including more chains leads to steric hindrance as the hub is too small to accommodate the radiating chains.
• a trisubstituted phenyl hub is highly preferred with the chains being symmetrically placed about the hub. Biphenyl, naphthyl, azaline (e.g., melamine), or other aromatic moieties may also be used as the hub radical.
• Multidimensional polyamideimide oligomers include oligomers of the general formula:
• Ar is an aromatic radical (generally phenyl) generally selected from phenyl, naphthyl, biphenyl, azalinyl (such as melamine), or triazine derivatives of the general formula:
• R 2 a divalent hydrocarbon residue containing 1-12 carbon atoms, as described in U.S. Pat. No. 4,574,154.
• the hub may also be a residue of an etheranhydride of the formula:
• the hub includes the phenyl radical, since these compounds are relatively inexpensive, are more readily obtained, and provide oligomers with high thermal stability.
• the chains of the oligomers include crosslinking end caps which improve the solvent-resistance of the cured composites. These end caps may be thermally or chemically activated during the curing step to provide a strongly crosslinked, complex, multidimensional array of interconnected oligomers.
• the oligomers may be formed by the attachment of arms to the hub followed by chain extension and chain termination.
• trihydroxybenzene may be mixed with p-aminophenol and 4,4'-dibromodiphenylsulfone and reacted under an inert atmosphere at an elevated temperature to achieve an amino-terminated "star" of the general formula:
• the etheranhydride hub can be synthesized by reacting nitrophthalic anhydride or halophthalic anhydride with Ar( — 0H)w in a suitable solvent under an inert atmosphere, as described generally in U.S. Pat. Nos. 3,933,862 and 4,851,495 (thio-analogs).
• oligomers might be made by reacting nitrophthalic anhydride with an amine functional end cap followed by the condensation with the hydroxy hub or in similar reaction schemes that will be understood by those of ordinary skill.
• the oligomers can be synthesized in a homogeneous reaction scheme wherein all the reactants are mixed at one time, or in a stepwise reaction scheme wherein the radiating chains are affixed to the hub and the product of the first reaction is subsequently reacted with the end cap groups.
• the hub may be reacted with end-capped arms that include one reactive, terminal functionality for linking the arm to the hub.
• Homogeneous reaction is preferred, resulting undoubtedly in a mixture of oligomers because of the complexity of the reactions.
• the products of the processes are oligomer mixtures which can be used without further separation to form desired advanced composites.
• Linear or multidimensional oligomers can be synthesized from a mixture of four or more reactants so that extended chains may be formed. Adding components, however, adds to the complexity of the reaction and of its control. Undesirable competitive reactions may result or complex mixtures of macromolecules having widely different properties may be formed, because the chain extenders and chain terminators are mixed, and compete with one another.
• Multidimensional etherimides can be made by reacting the etheranhydride hub with compounds of the formulae II, III, and IV previously described.
• Multidimensional amides are prepared by condensing a nitro, amine, or acid halide hub with suitable diamines, dicarboxylic acid halides, and amine or acid halide end cap monomers to form oligomers of the general formulae:
• Multidimensional imides can be made using the amine, etheranhydride, or etheramine hubs with suitable dianhydrides, and amine or anhydride end caps. Particularly preferred multidimensional imides include by condensing anhydride end caps directly with the amine hubs.
• Multidimensional polyesters can be made using hydroxy or carboxylic acid hubs (particularly cyuranic acid) with suitable diols and diacid halides.
• Carboxylic acid hubs include those compounds described in U.S. Pat. No. 4,617,390 and compounds prepared by reacting polyols, such as phloroglucinol, with nitrobenzoic acid or nitrophthalic acid to form ether linkages and active, terminal carboxylic acid funtionalities.
• the nitrobenzoic acid products would have three active sites while the nitrophthalic acid products would have six; each having the respective formula:
• Hubs can also be formed by reacting the corresponding halo-hub (such a tribromobenzene) with aminophenol to form triamine compounds represented by the formula:
• the hub may also be a polyol such as those described in U.S. Pat. No. 4,709,008 to tris(hydroxyphenyl)alkanes of the general formula:
• R hydrogen or methyl and can be the same or different.
• the polyols are made by reacting, for example, 4-hydroxybenzaldehyde or 4-hydroxyacetophenone with an excess of phenol under acid conditions (as disclosed in U.S. Pat. Nos. 4,709,008; 3,579,542; and 4,394,469).
• polyols may also be reacted with nitrophthalic anhydride, nitroaniline, nitrophenol, or nitrobenzoic acids to form other compounds suitable as hubs as will be understood by those of ordinary skill.
• Phenoxyphenyl sulfone arms radiating from a hub with a terminal amine, carboxylic acid, or hydroxyl group are also precursors for making multidimensional polyester oligomers of the present invention.
• Yi a crosslinking end cap as previously defined (i.e. D 1 — ⁇ — ).
• a halosubstituted hub is reacted with phenol in DMAC with a base (NaOH) over a Cu Ullmann catalyst to produce an ether "star" with active hydrogens para- to the ether linkages.
• 1 mole of trichlorobenzene can be reacted with about 3 moles of phenol in the Ullmann ether reaction to yield an intermediate of the general formula: ⁇ — ( — O — ⁇ )3, which can be reacted with about 3 moles of (Yi) — COCl to produce the final, crosslinkable, ether/carbonyl oligomer.
• Blends can improve impact resistance of pure oligomer composites without causing a significant loss of solvent resistance.
• the advanced composite (i.e. mixed chemical) blends of the present invention comprise mixtures of one or more crosslinkable oligomer and one or more polymer from a different chemical family. The polymers are incapable of crosslinking.
• the crosslinkable oligomer and the compatible polymer can be blended together by mixing mutually soluble solutions of each. While the blend is often equimolar in the oligomer and polymer, the ratio of the oligomer and polymer can be adjusted to achieve the desired physical properties.
• the properties of the composite formed from the advanced composite blend can be adjusted by altering the ratio of formula weights for the polymer and oligomer.
• quenching compounds can be employed, if desired, to regulate the polymerization of the comparable polymer, so that, especially for linear systems, the polymer has an average formula weight initially substantially greater than the crosslinkable oligomer.
• an aromatic quenching compound such as aniline, phenol, or benzoic acid chloride is preferred.
• the noncrosslinking polymer can be made by the same synthetic method as the oligomer with the substitution of a quenching cap for the crosslinking end cap.
• Solvent resistance of the cured composite may decrease markedly if the polymer is provided in large excess to the oligomer in the blend.
• the advanced composite blends may, in the case of coreactive oligomers and in other cases, include multiple oligomers or multiple polymers, such as a mixture of an amideimide oligomer, an amide oligomer, and an imide polymer or a mixture of an amideimide oligomer, an amideimide polymer, and an imide polymer (i.e. blended amideimide further blended with imide).
• the advanced composite blend can include a coreactant, such as p-phenylenediamine, benzidine, or 4,4'-methylene-dianiline.
• Ethersulfone oligomers can include these imide coreactants or anhydride or anhydride-derivative coreactants, as described in U.S. Pat. No. 4,414,269. Other combinations of oligomers, polymers, and coreactants can be used, as will be recognized by those of ordinary skill in the art.
• the oligomeric component of the advanced composite blend may itself be a blend of the oligomer and a compatible polymer from the same chemical family, further blended with the compatible polymer from the different family.
• the advanced composite blends also, can simply be made from three or more oligomeric or polymeric components. They generally include only one oligomeric component unless coreactive oligomers are used.
• a diamine of the formula H2N-R3-NH2 is reacted with two moles of an acid anhydride of the formula:
• the intermediate is then condensed with Y — ⁇ — COCl and a diamine of the formula H 2 N — R 4 — NH 2 to yield the desired product.
• a diamine of the formula H 2 N — R3 — NH 2 is reacted with an acid anhydride as in Example 1 to form a dicarboxylic acid intermediate that can be reacted with another diamine of the formula H 2 N — R 4 — NH 2 and an acid halide endcap of the formula Y — ⁇ — COCl to yield the desired product.
• a relatively high-average-formula weight poly ether polymer is made by condensing a dialcohol of the general formula.
• the two solutions are mixed to form the advanced composite blend, which can be prepregged or dried prior to curing to an advanced amideimide/ether composite.
• the oligomer is prepared by reacting:
• Example 7 Under an inert atmosphere to yield: Competitive side reactions between the reactants in Example 7 will likely hinder the yield of this product and will make isolation of the product difficult. Yield can be enhanced by adding the reactants serially, but the physical properties of the resulting oligomers might be impaired.

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