Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D19/00—Structural or constructional details of bridges
  • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
  • E01D19/125—Grating or flooring for bridges
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J11/00—Recovery or working-up of waste materials
  • C08J11/04—Recovery or working-up of waste materials of polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/06—Polyethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/08—Homopolymers or copolymers of acrylic acid esters
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
  • E01B3/44—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from other materials only if the material is essential
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K9/00—Use of pretreated ingredients
  • C08K9/08—Ingredients agglomerated by treatment with a binding agent
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2207/00—Properties characterising the ingredient of the composition
  • C08L2207/06—Properties of polyethylene
  • C08L2207/062—HDPE
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D2101/00—Material constitution of bridges
  • E01D2101/40—Plastics

Definitions

• This invention pertains to new building forms made of degradation-resistant composites; structures produced from such novel forms; and related methods of producing and using such forms and structures.
• Structural recycled plastic lumber represents a possible alternative to chemically treated lumber.
• U.S. Patent Nos. 6,191,228, 5,951,940, 5,916,932, 5,789,477, and 5,298,214 disclose structural recycled plastic lumber composites made from post-consumer and post-industrial plastics, in which polyolefms are blended with polystyrene or a thermoplastic coated fiber material such as fiberglass. These structural composites presently enjoy commercial success as replacements for creosoted railroad ties and other rectangular cross-sectioned materials. The market has otherwise been limited for structural recycled plastic lumber, because it is significantly more expensive than treated wooden beams on an installed cost basis, despite the use of recycled waste plastics.
• Structural beams that do not "creep” can also be prepared from engineering resins such as polycarbonates or ABS. However, these are even more costly than the structural composites made from recycled plastics. There remains a need for structural materials based on recycled plastics that are more cost-competitive with treated lumber on an installed cost basis.
• the immiscible polymer blends of U.S. Patent Nos. 6,191,228, 5,951,940, 5,916,932, 5,789,477, and 5,298,214 can be formed into structural shapes that are more cost-efficient than traditional recycled plastic structural beams with rectangular cross-sections.
• the structural shapes according to the present invention are molded as a single integrally-formed article and include modular forms such as I-Beams, T-Beams, C-Beams, and the like, in which one or more horizontal flanges engage an axially disposed body known in the art of I-Beams as a web.
• the reduced cross-sectional area of such forms represents a significant cost savings in terms of material usage without sacrificing mechanical properties. Additional cost savings are obtained through modular construction techniques permitted by the use of such forms.
• a modular plastic structural composite having web section disposed along a horizontal axis and at least one flange section disposed along a horizontal axis parallel thereto and integrally molded to engage the top or bottom surface of the web section, wherein the composite is formed from a mixture of (A) high density polyolefin and (B) a thermoplastic-coated fiber material, polystyrene, or a combination thereof.
• the high- density polyolefin is preferably high-density polyethylene (HDPE).
• the thermoplastic-coated fiber material is preferably a thermoplastic-coated carbon, or glass fibers such as fiberglass.
• a modular plastic structural composite comprising a web section disposed along a horizontal axis and at least one flange section disposed along a horizontal axis parallel thereto and integrally molded to engage the top or bottom surface of said web section, wherein said composite is formed from a mixture of (A) high density polyolefin and (B) a thermoplastic-coated fiber material, poly(methyl methacrylate), or a combination thereof.
• the flange dimensions relative to the dimensions of the web section cannot be so great to result in buckling of the flange sections upon the application of a load.
• the vertical dimension (thickness) of the flange section is about one-tenth to about one-half the size of the vertical dimension of the web section without any flange section(s) and the width dimension of the entire flange section measured perpendicular to the horizontal axis of the flange section is about two to about ten times the size of the width dimension measured perpendicular to the horizontal axis of the web section.
• interlocking assemblies reduce the required board thickness because of the manner in which the assembly distributes loads between the interlocked boards. This also represents a significant cost savings in terms of material usage without sacrificing mechanical properties, with additional cost savings also obtained through the modular construction techniques these forms permit.
• an essentially planar modular plastic structural composite having a grooved side and an integrally molded tongue-forming side, each perpendicular to the plane of the composite, in which the composite is formed from a mixture of (A) high-density polyolefm and (B) a thermoplastic-coated fiber material, polystyrene, or a combination thereof, wherein the grooved side defines a groove and the tongue- forming side is dimensioned to interlockingly engage a groove having the dimensions of the groove defined by the grooved side, and the grooved side and tongue-forming side are dimensioned so that a plurality of the essentially planar modular plastic structural composites may be interlockingly assembled to distribute a load received by one assembly member among other assembly members.
• a modular structural composite in which polystyrene is replaced with poly(methyl methacrylate) (PMMA).
• PMMA poly(methyl methacrylate)
• the composite includes from about 20 to about 65 wt% of a poly(methyl methacrylate) component containing at least about 90 wt% poly(methyl methacrylate) and from about 40 to about 80 wt% of a high-density polyolefm component containing at least about 75 wt% high-density polyethylene (HDPE).
• HDPE high-density polyethylene
• Preferred planar modular plastic structural composites have at least one pair of parallel opposing grooved and tongue-forming sides, defining therebetween a width or length dimension of the composite.
• Preferred composites also have board-like dimensions in which the length dimension is a matter of design choice and the width dimension is between about two and about ten times the size of the height, or thickness, dimension of the composite.
• a bridge constructed from the I-Beams of the present invention, having at least two pier-supported parallel rows of larger first I- beams, and a plurality of smaller second I-beams disposed parallel to one another and fastened perpendicular to and between two rows of the larger first I-Beams, wherein the top and bottom surfaces of the second I-Beam flanges are dimensioned to nest within the opening defined by the top and bottom flanges of the first I-Beams.
• first I-Beams The distance between the rows of first I-Beams and the rows of second I- Beams will depend upon factors such as the flange and web dimensions, the plastic components of the composite and the load to be supported by the bridge. Furthermore, whether the horizontally disposed axes of the first or second I-Beams extend in the direction of travel on the bridge is a matter of design choice, which may in whole or in part depend upon the aforementioned factors.
• the top surfaces of the second I-Beams are recessed below the top surfaces of the first I-Beams by a distance that is at least the thickness dimension of the top flange of the first I-Beam.
• Bridges constructed according to this aspect of the present invention will therefore further include a deck surface fastened to the first or second I-Beams.
• Preferred deck surfaces are dimensioned to fit between the top flanges of the parallel rows of the first I-beams. Even more preferred deck surfaces have a thickness dimension selected to provide the deck surface with a top surface that is essentially flush with the top surfaces of the parallel rows of first I-Beams.
• FIG. 1 Other preferred deck surfaces are formed from the essentially planar modular plastic structural composites of the present invention having interlocking grooved and tongue-forming sides.
• the modular components of the present invention permit the construction of load-bearing assemblies with fewer required fasteners, reducing the initial bridge cost, as well as the long-term cost of maintaining and replacing these corrosion-prone components.
• the plastic composite material also outlasts treated wood and requires significantly less maintenance than wood over its lifetime, further contributing to cost savings.
• a composite building material formed from a mixture of high density polyolefin and poly(methyl methacrylate). This material can be formed into various articles such as railroad ties and structural sheets.
• polyolefin and poly(methyl methacrylate) can form immiscible polymer blends by replacing polystyrene with PMMA. This observation is surprising because there is no way to predict which plastics will form acceptable immiscible polymer blends with polyolefin. For example, polyvinyl chloride does not form such a blend with polyolefin.
• the polyolefin/PMMA blends of the present invention possess unexpected properties. For example, they are stiffer than the polyolefin/polystyrene blends even though polystyrene and PMMA alone each have essentially the same stiffness, as measured by tensile modulus. It is also surprising that the polyolefin/PMMA blends are nearly as strong as PMMA alone.
• FIG.l depicts a cross-sectional view of an I-Beam according to the present invention.
• FIG. 2 is a side-view of the I-Beam of FIG. 1, perpendicular to the cross- sectional view;
• FIG. 3 depicts a cross-sectional view of a C-Beam according to the present invention
• FIG. 4 is a side view of the C-Beam of FIG. 3, perpendicular to the cross- sectional view;
• FIG. 5 depicts a cross-sectional view of a T-Beam according to the present invention.
• FIG. 6 is a bottom view of the T-Beam of FIG. 5;
• FIG. 7 depicts a cross-sectional view of tongue and groove decking panels according to the present invention
• FIG.8 depicts a side view of a bridge according to the present invention assembled from the I-Beams of the present invention
• FIG. 9 is a top cutaway view of the bridge of FIG. 8;
• FIG. 10 is a top cutaway view depicting the perpendicular fastening of a smaller I-Beam according to present invention to a larger I-Beam according to the present invention.
• FIG. 11 is a plot of log viscosity versus log shear rate comparing extruded composites having various percentages of PMMA;
• FIG. 12 is a plot of log viscosity versus percent PMMA for extruded composites
• FIG. 13a is a heat flow analysis to determine the melting point of extruded composites upon initial heating
• FIG. 13b is a heat flow analysis to determine the melting point of extruded composites following the initial heating shown in FIG. 13 a;
• FIG. 13c is a plot of the melting temperatures of extruded composites as a function of percent PMMA;
• FIG. 13d is a plot of the heat of fusion of extruded composites as a function of percent PMMA;
• FIG. 14 is a plot of stress versus strain for extruded composites;
• FIG. 15 is a plot of modulus as a function of percent PMMA for extruded composites
• FIG. 16 a plot of log modulus versus log time for extruded composites
• FIG. 17 is a series of SEM images of the surface structure of. extruded composites.
• FIG. 18 is a series of SEM images of the surface structure of a 60/40 PMMA/HDPE extruded composite
• FIG. 19 is a plot of peak stress of composites formed via injection molding as a function of percent PMMA
• FIG. 20 is a plot of strain at fracture of composites formed via injection molding as a function of percent PMMA
• FIG. 21 is a plot of stress versus strain for composites formed via injection molding
• FIG. 22 is a plot of modulus as a function of percent PMMA for composites formed via injection molding.
• FIG. 23 is a plot of HDPE phase melting temperature as a function of percent PMMA for composites formed via injection molding.
• the modular plastic structural composites of the present invention are prepared using the co-continuous polymer blend technology disclosed by U.S. Patent Nos. 5,298,214 and 6,191,228 for blends of a high-density polyolefm and polystyrene and by U.S. Patent No. 5,916,932 for blends of a high-density polyolefm and thermoplastic-coated fiber materials.
• U.S. Patent Nos. 5,298,214 and 6,191,228 for blends of a high-density polyolefm and polystyrene
• U.S. Patent No. 5,916,932 for blends of a high-density polyolefm and thermoplastic-coated fiber materials.
• composite materials may be employed containing from about 20 to about 50 wt% of a polystyrene component containing at least about 90wt% polystyrene and from about 50 to about 80 wt% of a high-density polyolefm component containing at least about 75 wt% high-density polyethylene (HDPE).
• Composite materials containing about 25 to about 40 wt% of a polystyrene component are preferred, and composite materials containing about 30 to about 40 wt% of a polystyrene component are even more preferred.
• Polyolefm components containing at least about 80 wt% HDPE are preferred, and an HDPE content of at least about 90 wt% is even more preferred.
• the blend technology disclosed in U.S. Patent No. 6,191,228 can also be employed in the present invention to formulate composite materials comprising a poly(methyl methacrylate) component in place of or in addition to the polystyrene component.
• Composite materials may be employed containing a poly(methyl methacrylate) (PMMA) component containing at least 90 wt% PMMA with the balance of the composite material being a high-density polyolefm component containing at least 75 wt% high-density polyethylene (HDPE).
• PMMA poly(methyl methacrylate)
• HDPE high-density polyolefm component
• Polyolefm components containing at least about 80 wt% HDPE are preferred, and an HDPE content of at least about 90 wt% is even more preferred.
• the minimum amount of the PMMA component in the blend is that quantity effective to produce a perceptible increase in melt viscosity.
• Composite materials containing from about 0.1 to about 65 wt% of poly(methyl methacrylate) (PMMA) are preferred.
• Composite materials containing from about 10 to about 40 wt% of PMMA are more preferred, and composite materials containing from about 20 to about 35 wt% of PMMA are most preferred.
• the polyolefin/PMMA blends of the present invention possess unexpected properties. For example, they are stiffer than the polyolefin/polystyrene blends even though polystyrene and PMMA alone each have essentially the same stiffness, as measured by tensile modulus.
• this composite may be further blended with thermoplastic-coated fibers having a minimum length of 0.1 mm so that the finished product contains from about 10 to about 80 wt% of the thermoplastic-coated fibers.
• U.S. Patent No. 5,916,932 discloses composite materials containing from about 20 to about 90 wt% of a polymer component that is at least 80 wt% HDPE and from about 10 to about 80 wt% of thermoplastic-coated fibers.
• the polyolefin-polystyrene composite materials suitable for use with the present invention exhibit a compression modulus of at least 170,000 psi and a compression strength of at least 2500 psi.
• Preferred polyolefin-polystyrene composite materials exhibit a compression modulus of at least 185,000 psi and a compression strength of at least 3000 psi.
• More preferred polyolefin-polystyrene composite materials exhibit a compression modulus of at least 200,000 psi and a compression strength of at least 3500 psi.
• Preferred polyolefin-PMMA composite materials suitable for use with the present invention exhibit a compression modulus of at least 227,000 psi and a compression strength of at least 3900 psi.
• the most preferred polyolefin-PMMA composite materials exhibit a compression modulus of at least 249,000 psi and a compression strength of at least 4300 psi.
• Composite materials containing thermoplastic-coated fibers according to the present invention exhibit a compression modulus of at least 350,000 psi.
• the compression modulus exhibited by preferred fiber-containing materials is at least
• the composite materials containing thermoplastic-coated fibers exhibit a compression strength of at least 4000 psi.
• the compression strength exhibited by preferred fiber-containing materials is at least 5000 psi.
• the polyolefin/PMMA blends of the present invention are suitable for composite building materials, such as, dimensional lumber. Lumber made from these blends can be used as joists, posts, and beams, for example.
• the toughness of polyolefin/PMMA lumber offers an additional safety feature as the material would sag before fracture to provide a warning of possible failure.
• the thermoplastic fiber- containing polyolefin/PMMA blends are also suitable for the fabrication of railroad ties. For certain applications such as, for example, railroad ties, it is important that the composite building material exhibit some very specific properties. For example, the material must be non- water or fuel absorbent, resistant to degradation and wear, resistant to the typical range of temperatures through which train tracks are exposed and non-conductive.
• the railroad ties must meet certain mechanical criteria.
• the plastic composite railroad tie will have a compressive modulus of at least about 170,000 psi along the tie's axis.
• tie's axis it is meant the longest axis of the railroad tie.
• the composite building material useful as a railroad tie will have a compressive modulus along the tie's axis of at least 200,000 psi and even more preferably 225,000 psi.
• the plastic composite material will have a compressive modulus of at least about 250,000 psi.
• the present invention is particularly well suited for railroad ties because of the different properties exhibited by the composite building materials along different axes. Because of the highly oriented fiber content in the direction of the floor (the long axis of a railroad tie), the tie exhibits tremendous strength and rigidity along that axis. At the same time, in a perpendicular axis which cuts across the orientation of the fiber content, the tie is relatively softer and flexible. Thus, a railroad tie made from the composite building material in accordance with the present invention will not bend or stress rail laid perpendicularly thereon, as there is some give in that direction. However, because of the strength of the tie along the tie's longest axis, rails attached thereto will not be allowed to shift laterally or separate.
• the railroad ties of the present invention are vastly superior to either wood or concrete ties currently employed.
• Lateral load refers to the outward pressure exerted by the train's wheels on the rails.
• the composite building material should also bear a vertical static load of at least about 39,000 lbs. This measures a tie's ability to stand up to having a train parked on top of it without permanent deformation, or having the rail driven into the tie.
• the toughness of the polyolefin/PMMA material improves the ability of the material to accept a spike without fracturing.
• a vertical dynamic load of at least 140,000 lbs. is also required. This measures the ability of a tie to handle train traffic.
• FIG. 1 A cross-sectional view of an I-Beam 10 according to the present invention is depicted in FIG. 1, with a side view of the same I-Beam shown in FIG. 2.
• the I-beam has a traditional structure consisting of middle "web" or "body” section 20, an upper flange 30, and a lower flange 40.
• the flange sections include a protruding section 50 that extends beyond the width of the web 20.
• the face of the web 60 forms a structure that can engage other structures (e.g., smaller beams), as described further below.
• the width A of the flange sections is significantly wider than the width B of the web section.
• the height C_ of the flange sections is smaller than the height of the web sections.
• a cross-sectional view of a C-Beam 12 according to the present invention is depicted in FIG. 3, with a side view of the same C-Beam shown in FIG. 4.
• the C- beam also has a middle web section 20, an upper flange 30, and a lower flange 40.
• the flange sections also include a protruding section 50 that extends beyond the width of the web 20.
• the face of the web 60 also forms a structure that can engage other structures (e.g., smaller beams), as described further below.
• a cross-sectional view of a T-Beam 15 according to the present invention is depicted in FIG. 5, with a bottom view of the same T-Beam shown in FIG. 6.
• the T- beam has a structure consisting of middle web section 20 and an upper flange 30, but no lower flange.
• the flange section also includes a protruding section 50 that extends beyond the width of the web 20.
• the face of the web 60 also forms a structure that can engage other structures (e.g., smaller beams), as described further below.
• FIG. 7 shows assembled tongue-and-groove decking panels 100 and 150.
• Panel 100 includes an end 110 having a tongue-shaped member 120 and an opposite end 130 defining a groove 140.
• Panel 150 includes an end 160 having a tongue- shaped member 170 and an opposite end 180 defining a groove 190.
• Tongue-shaped member 120 of panel 100 is depicted interlockingly engaging the groove 190 of panel 150.
• the groove 140 of panel 100 is also capable of interlockingly engaging a tongue-shaped member of another panel.
• the tongue-shaped member 170 of panel 150 is capable of engaging a groove of another panel.
• Flat top 125 of panel 100 and flat top 175 of panel 150 can serve as a load-bearing surface or barrier when such panels are assembled into a structure.
• FIG. 8 illustrates a side view and Fig. 9 a top partial cutaway view of a portion of a vehicular bridge 200 assembled from the above-described building forms.
• ends 211 and 212 of respective larger I-beam rails 213 and 214 are secured to respective pilings 216 and 217 by fasteners (not shown).
• the opposite respective I-Beam ends 220 and 221 are similarly secured to respective pilings 223 and 224.
• Ends 225, 226 and 227 of smaller joist I-beams 228, 229 and 230 are fastened to the face 260 of I-Beam 213, with respective opposing ends 231, 232 and 233 of the three smaller I-Beams fastened to the face 261 of I-Beam 214.
• ends 234, 235 and 236 of smaller joist I-beams 237, 238 and 239 are fastened to the face 262 of I-Beam 214.
• FIG. 10 is a top cutaway view depicting the fastening of end 225 of smaller joist I-Beam 228 to the face 260 of larger I-Beam 213 using L-shaped brackets 243 and 244 and fasteners 245, 246, 247 and 248. Bracket 243 and fasteners 245 and 246 fastening the end 225 of I-Beam 228 to face 260 of I-Beam 213 is also shown in FIG. 8. FIG. 8 also shows bracket 247 and fasteners 248 and 249 fastening end 231 of I- Beam 228 to face 261 of I-Beam 214.
• FIGS. 8 and 9 also show bridge deck 270 formed from interlocking panels 271 and 272 in which tongue 274 of panel 271 interlockingly engages groove 275 of panel 272. Tongue 276 of panel 272 interlockingly engages groove 277, and so forth.
• the respective top surfaces 279 and 280 of panels 271 and 272 comprise the surface 290 of bridge deck 270.
• Suitable fasteners are essentially conventional and include, without limitation, nails, screws, spikes, bolts, and the like.
• 6,191,228 may be employed to form the modular plastic structural composite shapes of the present invention.
• the composite blends are preferably extruded into molds from the extruder under force, for example from about 900 to about 1200 psi, to solidly pack the molds and prevent void formation.
• Both polyolefin/polystyrene and polyolefin/PMMA blends can also be used to form structural sheets having a thickness preferably from about 1/8 inch to about 1 inch.
• the length and width of the sheets preferably independently range from about 8 inches to about 20 feet.
• the structural sheets also have a compression modulus of at least 200,000 psi and a strength of at least 3,000 psi. "Strength" is defined as the highest stress level a material can be subjected to without fracturing into multiple pieces.
• the modular plastic structural composites of the present invention thus represent the most cost-effective non-degradable structural materials prepared to date having good mechanical properties.
• the present invention makes possible the preparation of sub-structures with given load ratings from quantities of materials reduced to levels heretofore unknown.
• Example 1 Extrusion HDPE (CP Chem Marlex HHM-5502BN) and PMMA (Atofina Plexiglass
• V045100 were mechanically mixed and melt blended using a Randcastle special compounding extruder operating at 180 RPM and 200 - 21O 0 C.
• Composition ratios of HDPE/PMMA were: 100/0, 90/10, 80/20, 70/30, 65/35, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, and 0/100.
• Rheological tests were conducted to investigate the viscosity of the pelletized extruded composites. As the PMMA content of the extruded composites increases towards neat PMMA, the viscosity of the extruded composites increases (FIG. 11).
• FIG. 14 is a plot of stress versus strain for each extruded composite. Table I sets forth the modulus (the ratio of stress to strain in flexural deformation) of the extruded composites according to composition:
• FIG. 15 The modulus of the extruded composites increases with PMMA content (FIG. 15).
• FIG. 16 is a plot of log modulus as a function of log time, which shows that the modulus of the blends and the resistance to deformation with time is increased with increasing PMMA content.
• HDPE CP Chem Marlex HHM-5502BN
• PMMA Adofma Plexiglass V045100
• Composites were molded at 392 0 F.
• Composition ratios of HDPE/PMMA 100/0, 90/10, 80/20, 70/30, 65/35 60/40, 50/50, and 40/60.
• the tensile strength of the blends remains fairly constant in all blends from pure polyolefm up to and including the co-continuous region.
• the tensile strain drops as PMMA is blended at higher percentages to polyolefm in a non-linear manner, but remains much higher than pure PMMA itself.
• the modulus of the blends increases as PMMA is increased, but with lower strain to failure and resulting toughness.
• FIG. 21 Many of the blends indicate higher toughness than PMMA or polyolefm alone. Results from FIG. 21 are summarized in Table II: Table II.

Landscapes

• Chemical & Material Sciences (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Laminated Bodies (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=43013613

Family Applications (1)

Country Status (8)

Families Citing this family (2)

Citations (6)

Family Cites Families (2)

• 2006
  • 2006-05-19 RU RU2007147255/04A patent/RU2007147255A/ru not_active Application Discontinuation
  • 2006-05-19 MX MX2007014615A patent/MX2007014615A/es active IP Right Grant
  • 2006-05-19 EP EP06770600A patent/EP1896528A4/de not_active Withdrawn
  • 2006-05-19 CA CA2611976A patent/CA2611976C/en active Active
  • 2006-05-19 WO PCT/US2006/019311 patent/WO2006125111A1/en active Application Filing
  • 2006-05-19 KR KR1020077029455A patent/KR20080048444A/ko not_active Application Discontinuation
• 2007
  • 2007-12-18 CR CR9600A patent/CR9600A/es not_active Application Discontinuation
  • 2007-12-18 EC EC2007008033A patent/ECSP078033A/es unknown

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events