Synthetic method of high molecular weight (HMW) alternating copolymer of styrene and maleic anhydride

A technology of alternating copolymers and maleic anhydride, which is applied in the field of precipitation polymerization to prepare high molecular weight styrene and maleic anhydride alternating copolymers, achieving the effects of simple post-processing, high molecular weight, and reducing environmental pollution

Inactive Publication Date: 2009-11-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that using alkyl esters of organic acids as the reaction medium, the polymerization method for preparing high molecular weight styrene and maleic anhydride alternating copolymers by precipitation polymerization has not been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The molar ratio of MAn and St is 1:1, wherein MAn is 9.806g and St is 10.4g; the initiator is azobisisobutyronitrile (AIBN) 0.0000164g; the medium is isoamyl acetate, 45mL. Heating in a water bath, reacting at a temperature of 50° C. for 72 hours under the protection of nitrogen to obtain a dispersed system of alternating copolymers of styrene and maleic anhydride. The number average molecular weight of the copolymer measured by viscosity method is 669575 g / mol. (The number-average molecular weight in this article is measured by viscosity method, the solvent is acetone, and the temperature is 30°C)

Embodiment 2

[0028] The molar ratio of MAn and St is 1:1, wherein MAn is 9.806g and St is 10.4g; the initiator is azobisisobutyronitrile (AIBN) 0.000164g; the medium is isoamyl acetate, 45mL. Heating in a water bath, reacting at a temperature of 60° C. for 36 hours under the protection of nitrogen to obtain a dispersed system of alternating copolymers of styrene and maleic anhydride. The number average molecular weight of the copolymer measured by the viscosity method is 582199 g / mol.

Embodiment 3

[0030] The molar ratio of MAn and St is 1:1, wherein MAn is 12.2575g and St is 13g; the initiator is azobisisobutyronitrile (AIBN) 0.0000329g; the medium is isoamyl acetate, 45mL. Heating in a water bath, reacting at a temperature of 70° C. for 24 hours under the protection of nitrogen to obtain a dispersed system of alternating copolymers of styrene and maleic anhydride. The number average molecular weight of the copolymer measured by viscosity method is 432235 g / mol.

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Abstract

A synthetic method of a high molecular weight (HMW) alternating copolymer of styrene and maleic anhydride belongs to the high molecular precipitation polymerization field. The copolymer obtained by the current methods for preparing the copolymer of the styrene and maleic anhydride has smaller molecular weight or has higher requirements on equipments and processes. The synthetic method comprises the following steps: taking organic acid alkyl ester or mixed solvent of ketone and alkane as a polyreaction medium, taking organic peroxide or azo compound as an initiator to initiate monomer maleic anhydride to react with the styrene and obtaining the HMW alternating copolymer of styrene and maleic anhydride through precipitation polymerization. The method has simple process and simple post treatment of synthesized copolymer, and has the characteristics of being low in cost and environment-friendly, etc.

Description

technical field [0001] The invention belongs to the field of polymer precipitation polymerization, and in particular relates to a method for preparing high molecular weight styrene and maleic anhydride alternating copolymers by precipitation polymerization. Background technique [0002] Alternating copolymer of high molecular weight styrene and maleic anhydride is a new type of thermoplastic engineering plastic with excellent performance and low price. It is widely used in automobile manufacturing, household appliances, office facilities, tool manufacturing, etc. [0003] At present, the preparation methods of styrene-maleic anhydride copolymers mainly include solution polymerization, a small amount of bulk polymerization, bulk-suspension polymerization, precipitation polymerization and solution phase inversion emulsion polymerization. [0004] Li Huaming, Zhou Disheng, etc., in the article "Synthesis of Styrene-Maleic Anhydride Random Copolymer by Solution Polymerization" (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/08C08F212/08C08F2/14
Inventor 杨万泰孙应发邓建元马育红
Owner BEIJING UNIV OF CHEM TECH
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