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Alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and preparation method thereof

A technology of methyl styrene and random copolymers, which is applied in the field of polymer polymerization, can solve the problems of inability to form functional grafts with copolymers, and achieve the effects of good processing performance, good heat resistance, and low melt viscosity

Inactive Publication Date: 2016-07-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

R-SMA contains styrene components. If it is used as a compatibilizer, it can only be compatible with blending systems with better compatibility with styrene (such as PA6 / ABS, PA6 / PS, etc.), while for R-SMA The blending system with poor compatibility will not have a good compatibilization effect. This is because the bond energy between St and MAH in R-SMA is high, and it will not depolymerize at high temperature, so it can only be compatibilized in situ. Mixed system, instead of copolymers containing AMS units like PAG, which can not only generate functional grafts with polyolefins at high temperature, but also in-situ compatibilize the blended system

Method used

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  • Alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and preparation method thereof
  • Alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and preparation method thereof
  • Alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The molar ratio of AMS and St is 3:5, wherein AMS is 3.6g, St is 5.2g, the solvent is butanone 10mL (monomer mass concentration 45%), the concentration of MAH solution is 0.5g / mL, and the total amount of MAH added is 1.8g, The initiator is 0.44 g of dibenzoyl peroxide (BPO). Heated in an oil bath, under the condition of 85°C nitrogen flow, after 10 minutes of reaction, MAH solution was added dropwise, one drop every 3 seconds, and samples were taken after 15 minutes, 30 minutes, 45 minutes, 60 minutes, 75 minutes, 90 minutes and 105 minutes of reaction respectively, and three A solution of a random copolymer, the solution is precipitated in methanol, centrifuged, and dried to obtain a white powder of α-methylstyrene-styrene-maleic anhydride ternary random copolymer. The conversion rate of the monomer measured by the gravimetric method increased with time, and the maleic anhydride content of the copolymer was basically maintained at a certain value by the acid-base titra...

Embodiment 2

[0059] AMS and St molar ratio 3:5, wherein AMS7.2g, St10.4g, solvent is butanone 24mL (monomer mass concentration 40%), MAH solution concentration is 0.5g / mL, MAH addition is 3.6g, triggers The agent is BPO0.88g. Heating in an oil bath, under the condition of 85°C nitrogen flow, start to add MAH solution dropwise after 10 minutes of reaction, drop every 3 seconds, add dropwise for 120 minutes, and continue to react for 30 minutes after dropping. After the reaction, the product was precipitated in methanol, suction filtered, and dried to obtain α-methylstyrene-styrene-maleic anhydride ternary random copolymer with a yield of 39.2%. The content of MAH in the copolymer was 28.8% as determined by acid-base titration, and the content of AMS in the copolymer as measured by elemental analysis was 18%. The molecular weight of the copolymer data is 12000 g / mol, and the molecular weight distribution coefficient is 2.3.

[0060] NMR of the prepared copolymer ( 13 C-NMR) spectrogram se...

Embodiment 3

[0062]AMS and St molar ratio 1:1, wherein AMS5.8g, St5.1g, solvent is butanone 24mL (monomer mass concentration 38%), MAH solution concentration is 0.5g / mL, MAH addition is 2.2g, triggers The agent is BPO0.61g. Under the condition of 85°C under nitrogen flow, after 10 minutes of reaction, the MAH solution was added dropwise, every 3 seconds, for 120 minutes, and the reaction was continued for 30 minutes after the dropwise addition. After the reaction, the product was precipitated in methanol, suction filtered, and dried to obtain α-methylstyrene-styrene-maleic anhydride ternary random copolymer with a yield of 36.2%. The content of MAH in the copolymer was 27.8% as measured by acid-base titration, and the content of AMS in the copolymer was 22.4% by elemental analysis.

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Abstract

The invention discloses an alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and a preparation method thereof, and belongs to the field of macromolecular polymerization.The preparation method comprises the steps that firstly, a monomer alpha-vinyltoluene, styrene and an initiator are added to a solvent to be dissolved, and the solution is heated to 80 DEG C to 110 DEG C; then, a semicontinuous sample introduction method is adopted for dropwise adding a solution containing maleic anhydride to a reaction system for 1 h to 3 h, and the reaction continues to be carried out for 30 min to 60 min after the solution is dropwise added; after the reaction is finished, the system is subjected to methyl alcohol precipitation, suction filtration and drying, and the alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer is obtained.The prepared alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer has the advantages that the content of maleic anhydride is high, and the glass transition temperature is low (low Tg facilitates machine shaping); meanwhile, an alpha-vinyltoluene structural unit is contained in the polymer chain of the ternary random copolymer, depolymerization occurs at high temperature to generate free radicals, and the alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer can be used as a macroinitiator to be applied to polyolefin grafting and polyolefin melt blending modification.

Description

technical field [0001] The invention belongs to the field of macromolecular polymerization, and in particular relates to a semi-continuous solution polymerization preparation method of α-methylstyrene-styrene-maleic anhydride ternary random copolymer. Background technique [0002] A macromolecular initiator is a polymer compound with a chain segment that is depolymerized at a high temperature to generate free radicals in the molecular chain. The advantages of macroinitiators lie in the following points: 1. Less sensitivity to impurities; 2. The relative molecular weight distribution of the block copolymer obtained after initiation is usually narrow. Due to the longer chain link of the macromolecular initiator, the diffusion effect and reactivity are lower than those of the small molecular initiator, which can reduce the free radical termination reaction inside the system and increase the controllability of the reaction. The research on synthesizing copolymers with macromole...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F212/12C08F222/08C08F2/06
CPCC08F212/08C08F212/12C08F2400/02C08F222/08C08F2/06
Inventor 杨万泰岳青陈冬王力马育红
Owner BEIJING UNIV OF CHEM TECH
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