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Acrylonitrile biopolymer spinning fluid having homogeneous chain structure and preparation thereof

A technology of acrylonitrile binary copolymer spinning and acrylonitrile binary copolymer, which is applied in the field of preparation of acrylonitrile binary copolymer spinning solution, which can solve the problem of uneven distribution, difficulty in preparing high-performance carbon fiber spinning solution, etc. problem, to achieve the effect of controllable molecular weight and uniform chain structure of acrylonitrile copolymer

Inactive Publication Date: 2009-04-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relatively large difference in copolymerization activity between comonomers leads to the uneven distribution of comonomer structural units in the molecular chain of acrylonitrile copolymers, which may be one of the main reasons why it is difficult to prepare high-performance carbon fiber spinning solutions

Method used

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  • Acrylonitrile biopolymer spinning fluid having homogeneous chain structure and preparation thereof
  • Acrylonitrile biopolymer spinning fluid having homogeneous chain structure and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 19.61 g of acrylonitrile, 0.40 g of β-MEI, 0.1601 g of azobisisoheptanonitrile, and 80 g of dimethyl sulfoxide, and add them into a reactor equipped with a condenser tube and a mechanical stirring device. Stirring and mixing at room temperature, nitrogen bubbling for 20 minutes, under nitrogen protection, polymerization reaction at 25° C. for 24 hours, and then removing residual monomers and bubbles to obtain a polyacrylonitrile-based binary copolymer spinning solution. The monomer conversion rate was 37.4%, the weight average molecular weight of the copolymer was 971,000, and the molecular weight distribution was 1.95.

Embodiment 2

[0021] Weigh 19.58 g of acrylonitrile, 0.41 g of β-MEI, 0.1601 g of azobisisoheptanonitrile, and 80 g of dimethyl sulfoxide, and add them into a reactor equipped with a condenser tube and a mechanical stirring device. Stirring and mixing at room temperature, nitrogen bubbling for 20 minutes, under nitrogen protection, polymerization at 45°C for 24 hours, and then removing residual monomers and bubbles to obtain a polyacrylonitrile-based binary copolymer spinning solution. The monomer conversion rate was 96.4%, the weight average molecular weight of the copolymer was 155,000, and the molecular weight distribution was 2.28.

Embodiment 3

[0023] Weigh 19.61 g of acrylonitrile, 0.40 g of β-MEI, 0.1602 g of azobisisoheptanonitrile, and 80 g of dimethyl sulfoxide, and add them into a reactor equipped with a condenser tube and a mechanical stirring device. Stirring and mixing at room temperature, nitrogen bubbling for 20 minutes, under nitrogen protection, polymerization reaction at 35°C for 6 hours, and then removing residual monomers and bubbles to obtain a polyacrylonitrile-based binary copolymer spinning solution. The monomer conversion rate was 40.0%, the weight average molecular weight of the copolymer was 291,000, and the molecular weight distribution was 2.07.

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Abstract

The invention relates to an acrylonitrile biopolymer spinning solution with an even chain structure and a preparation method. The preparation method comprises the following steps: in dimethyl sulfoxide solution, using azo-bis-iso-heptonitrile to initiate acrylonitrile and itaconate beta-monoester to carry out copolymerization reaction, using small amount of propenol as a chain transfer agent to adjust molecular weight of the acrylonitrile copolymer, and synthesizing the acrylonitrile biopolymer with controllable molecular weight and narrower molecular weight distribution at a temperature of between 25 and 45 DEG C. The acrylonitrile biopolymer spinning solution has the characteristics that the synthesized biopolymer has the even chain structure and the controllable molecular weight; the molecular weight distribution index of the biopolymer is lower than 2.3; and the acrylonitrile biopolymer spinning solution with the even chain structure can be obtained after residual monomers and bubbles in the biopolymer are removed.

Description

[0001] Field [0002] The invention relates to an acrylonitrile binary copolymer spinning solution with uniform chain structure and a preparation method thereof, in particular to an acrylonitrile binary copolymer spinning solution with controllable molecular weight, uniform chain structure and containing itaconic acid β-monoester structural units. Preparation method of silk liquid. Background technique [0003] Carbon fiber is widely used in aerospace, national defense construction and civil industry due to its excellent mechanical properties, high temperature resistance, corrosion resistance and other properties. Acrylonitrile-based carbon fiber spinning solution is one of the main sources of carbon fiber preparation. How to improve the performance of carbon fiber has become a hot spot in carbon fiber research in recent years. Studies have shown that acrylonitrile copolymers with high molecular weight and narrow molecular weight distribution are one of the keys to obtain hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38C08F220/44C08F222/16C08F4/04C08F2/38D01F9/22
Inventor 李悦生李百祥张贵宝刘晓辉白云刚
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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