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Method for synthesizing low molecular weight phenylethylene / maleic anhydride alternate copolymer

A technology of alternating copolymer and maleic anhydride is applied in the field of preparing low molecular weight styrene/maleic anhydride alternating copolymer by precipitation polymerization, which can solve the problems of irritating odor of copolymer, unfavorable environmental protection, affecting the performance of copolymer and the like, To achieve the effect of simple post-treatment process and avoidance of influence

Active Publication Date: 2010-08-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently reported precipitation polymerization generally uses the toxic solvent toluene as the reaction medium, which is not conducive to environmental protection.
In addition, the use of mercaptan chain transfer agents causes the prepared copolymer to have a pungent odor, which affects the performance of the copolymer

Method used

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  • Method for synthesizing low molecular weight phenylethylene / maleic anhydride alternate copolymer
  • Method for synthesizing low molecular weight phenylethylene / maleic anhydride alternate copolymer
  • Method for synthesizing low molecular weight phenylethylene / maleic anhydride alternate copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Material preparation: monomer MAH 1.7658g, St 1.6892g, the molar ratio of the two is 1:0.90; initiator AIBN 0.1831g; solvent mixture of isoamyl acetate 9mL and cyclohexane 36mL; molecular weight regulator AMS 0.2132g .

[0028] Synthesis of copolymer: put MAH, AIBN and solvent in a four-neck flask equipped with a stirring device and nitrogen gas, stir at room temperature for 15 minutes, heat for 15 minutes in a constant temperature water bath at 80°C, and then drop them at a constant speed within 1 hour The mixture of St and AMS, after the dropwise addition, continue to stir and react for 1h to obtain a dispersion system of styrene / maleic anhydride alternating copolymer, centrifuge the dispersion and dry to obtain a white powder of styrene / maleic anhydride alternating copolymer .

[0029] Polymerization yield (C p ), the number average molecular weight (Mn) of the copolymer and its distribution (PDI) results are shown in Table 1, and the GPC spectrogram of the copolym...

Embodiment 2

[0031] Material preparation: monomer MAH 0.4420g, St 0.557g, the molar ratio of the two is 1:0.90; initiator AIBN 0.0459g; solvent is a mixture of 9mL butyl acetate and 36mL cyclohexane; molecular weight modifier AMS 0.0542g .

[0032] Synthesis of copolymers: put MAH, AIBN and solvent in a four-neck flask with a stirring device and nitrogen gas, stir at room temperature for 15 minutes, heat for 15 minutes in a constant temperature water bath at 80°C, and then drop them at a constant speed within 0.5 hours Complete the mixture of St and AMS, continue to stir and react for 8 hours after the dropwise addition, and obtain the dispersion system of styrene / maleic anhydride alternating copolymer, centrifuge and dry the dispersion system to obtain the white color of styrene / maleic anhydride alternating copolymer powder.

[0033] Polymerization yield (C p ), the number-average molecular weight (Mn) of the copolymer and its distribution (PDI) results are shown in Table 1.

Embodiment 3

[0035] Preparation of materials: monomer MAH 1.3245g, St 1.2685g, the molar ratio of the two is 1:0.96; initiator AIBN 0.1360g; solvent mixture of isoamyl acetate 36mL and n-hexane 9mL; molecular weight regulator VAC 0.1175g.

[0036] Synthesis of copolymer: put MAH, AIBN and solvent in a four-neck flask with a stirring device and nitrogen gas, stir at room temperature for 15 minutes, heat in a constant temperature water bath at 60°C for 15 minutes, and then drop them at a constant speed within 1 hour The mixture of St and VAC, after the dropwise addition, continue to stir and react for 6 hours to obtain a dispersion system of styrene / maleic anhydride alternating copolymer, centrifuge the dispersion system and dry to obtain a white powder of styrene / maleic anhydride alternating copolymer .

[0037] Polymerization yield (C p ), the number average molecular weight (Mn) of the copolymer and its distribution (PDI) results are shown in Table 1, and the GPC spectrogram of the copol...

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Abstract

A synthetic method of a styrene / maleic anhydride alternating copolymer with low molecular weight belongs to the field of macromolecular precipitation polymerization. Media and chain transfer agents used in the existing methods for preparing styrene / maleic anhydride copolymers by precipitation polymerization have disadvantages. In the synthetic method, the styrene / maleic anhydride alternating copolymer is prepared by taking a mixed solvent of organic acid alkyl ester and alkane as a reaction medium for the precipitation polymerization, alpha-methylstyrene or vinyl acetate as a molecular weightregulator and organic peroxide or an azo compound as an initiator for initiating a copolymerization reaction between styrene monomers and styrene. The synthetic method has simple process, the synthesized copolymer has good properties, and the method has the advantages of being economical, environment-friendly and the like.

Description

technical field [0001] The invention belongs to the field of polymer precipitation polymerization, in particular to a method for preparing low molecular weight styrene / maleic anhydride alternating copolymers by precipitation polymerization. Background technique [0002] Low-molecular-weight styrene / maleic anhydride alternating copolymer is a polymer with a wide range of uses. It can be used as paper surface sizing agent, organic pigment dispersant, and emulsion polymerization in papermaking, textile, printing and dyeing, coating, chemical and other industries. protective colloid etc. [0003] At present, the preparation methods of styrene / maleic anhydride copolymer mainly include solution polymerization, a small amount of bulk polymerization, bulk-suspension polymerization, and precipitation polymerization. Among them, compared with other polymerization methods, precipitation polymerization has the advantages of simple post-treatment process and low cost. [0004] For exam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F222/06C08F2/14
Inventor 邓建元赵鹏飞杨万泰
Owner BEIJING UNIV OF CHEM TECH
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