SU735602A1 - Method of preparing polymers - Google Patents

Description

(54) METHOD FOR OBTAINING POLYMERS

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This invention relates to the chemistry of high molecular weight compounds, in particular, to methods for producing polymeric compounds.

The known methods for the synthesis of high-molecular compounds (polymerization and polycondensation) do not allow the preparation of polymers directly from saturated hydrocarbons, ethers, ketones and other compounds.

The open reaction of polyrecombiners allows the use of high-molecular-weight hydrocarbons, which are not capable of polymerizing with conventional glands, in the processing of high-molecular compounds.

In order to carry out the loli-recombination reaction, it is necessary to have a source of free radicals and monomers with hydrogen atoms, easily detached by these radicals.

In the presence of two reactive hydrogen atoms in the monomer, linear polymers are formed, in the presence of three or more hydrogen atoms, branched and three-dimensional polymers.

However, the authors who opened the polyrecombination reaction used individual hydrocarbons with substituents only in the para-position as the feedstock, which narrows the sulfur base for polymer production and is associated with costly processes for the isolation of an individual hydrocarbon.

The closest technical solution to the invention is a method for producing polymers by polyrecombination of diethylbenzenes at 165-180 ° C in the presence of tertiary butyl peroxide at a molar ratio of 3: 1 2.

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However, the polymers obtained by this method are crosslinked.

The purpose of the invention is to obtain linear polymers.

This is achieved by the fact that polyrecombination of diethylbenzenes at 165-180 ° C in the presence of tertiary butyl peroxide is carried out at a molar ratio of diethylbenzene and peroxide of 1: 1-1: 2.

Characterization of the diethylbegool fraction,

20 constituting about 70% of polyalkylbenzenes, the recipe extracted from them is: product — a mixture of isomers of diethylbenzenes; boiling point - 175-185 C / 760 mm Hg. v .; . , 8633; P2 1,4949, Content of isomers,%: ortho-5, meta-70, gara-25. . The direct involvement of hydrocarbons in high-molecular compounds for processing, at the stage of their dehydrogenation, greatly simplifies the process technology, reduces the cost of the polymers produced and makes it possible to regulate the process towards the formation of the desired target polymer products. To achieve this goal, a mixture of isomers of diethylbenzene, placed in a flask with stirring, was heated under nitrogen to. the required temperature, after which the tertiary butyl peroxide was fed under the hydrocarbon layer at a rate of 5 ml. The nitrogen supply to the system was maintained at 2 l / h. After the end of the supply of peroxide, P1 stirring was continued for another 3iO minutes at a temperature of heat in order to react to the following quantities of peroxide fed into the system. . . The decay products of the tertiary butyl peroxide (acetone and tertiary butyl alcohol) collected in the prielshika and the trap were subjected to rectification. The polymer product formed in the flask was diluted with benzene, left for several hours to separate the insoluble part. Soluble; polymers1, which are the line of Hbd1dcd molecules5 and low molecular weight products of the reaction, are repositioned twice; remove from a benzene solution with methyl alcohol. Low molecular weight rye Limerig was isolated from the solution by distillation of methyl alcohol And benzene. For the synthesized linear polymers, the elemental composition, structure (by the method of infrared spectros; O1SH1n) molecular weight (by cryoscopy), solubility, –Teule1P1 7Krmöt thermometry curves for from 5 were measured, and the temperatures of glass transition and flow were recorded. . The physico-chemical characteristics of the polymers are given in the table. As follows from the table, when comparing the infrared spectra of the raw material and the synthesized polymers, it showed that polio cbi B-J values all and frequency ranges coincide with those of the original product. This circumstance made it possible to conclude that in this macromolecule, separate branches are connected in a chain, causing the inertia of its structure. For a better understanding of the present invention, the synthesis of examples of the preparation of linear polymers of distilbenzenes. Example 1. Experimental temperature: 165 ° C. Peroxide molar ratio; diethylbenzene 1: 12: 1 Polymer yield, h of the molecular molecule pHH1X of high molecular weight linear Example 2. Test temperature 170 ° С. The molar ratio of peroxide: diylbenzene. Polymer yield, wt.%: 97, 3 37.1 low molecular weight high molecular weight linear Example 3. Experiment temperature: 175 ° C. The molar ratio of peroxide: dithylbenzene1: 12: 1 Polymer yield, wt.%: Low molecular weight93.7 51.4 (High molecular linear linear -6348.6 Example 4. Test temperature 180 ° C. The molar ratio of peroxide, diztilbenzene1: 12: 1 Exit polymers, wt.%:. low molecular weight molecular weight 54.2 high molecular weight linear. The method allows to obtain linear polymers from production waste - a mixture of diethylben zomer mixtures, which significantly forgives the process technology, reduces the self-absorbability of the polymers produced and, depending on the post of the 8 goal, allows to synthesize one of the following types of linear polymeric compounds: low molecular weight or high molecular weight low molecular weight diethylbenzoic polymers can be used in the production of iakOiB, paints and adhesives, and high molecular weight linear polymers with wide diatzoMmO Kupyrnb1Kh scales for the production of the structure of the object patterns, which is used for the time-to-time patterns of the fire patterns. the invention allows linear polymers to be taught.

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F o rmula of the invention

The method of producing polymers by polyrecombination of diethylbenzenes at 165-180 ° C in the presence of tertiary butyl peroxide, about the same. In order to obtain linear polymers, diethylbenzene and peroxide are used in a molar ratio of 1: 1-1: 2.

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Sources of information accepted -BO attention 1ph expertise

1. Korshak, V.V., et al. Use of the poly-compounding reaction to produce polymers.

Reports of the Academy of Sciences of the USSR, 1958, No. 2, p. 299.

2. Authors certificate of the USSR N 186674, cl. C 08 F 212/14, 1963 (lyoTOTHn).

Claims (1)

Claim A method of producing polymers by polyrecombination of diethylbenzenes at 165-180 ° C in the presence of tertiary butyl peroxide, characterized in that, in order to obtain linear polymers, diethylbenzene and peroxide are used in a molar ratio of 1: 1-1: 2.