Poly(methyl) crylic acid-b-styrene-b-styrene/acrylonitrile) segmented copolymer latex and preparation method thereof

A technology of block copolymer and styrene, applied in the field of block copolymer materials, can solve the problems of inability to synthesize high molecular weight polymers and block copolymers well, the final conversion rate is only 66.7%, and the molecular weight of products is out of control. , to achieve the effect of easy pipeline transportation and continuous production, controllable molecular weight growth, and wide range of monomer composition

Inactive Publication Date: 2014-07-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the RAFT emulsion polymerization system has problems such as colloidal instability, slow polymerization and inhibition, wide molecular weight distribution, and obvious deviation between actual molecular weight and theoretical molecular weight.
Gilbert et al. used polyacrylic acid-polybutylacrylate amphiphilic macromolecular reversible addition fragmentation chain transfer reagents to carry out RAFT semi-continuous emulsion polymerization of styrene with starvation method, which solved the problem of emulsion instability, but the process was complicated and The deviation between the actual molecular weight and the theoretical molecular weight is large, and no block copolymer can be prepared; Charleux et al. used the reversible addition and fragmentation chain transfer reagent containing polyethylene oxide macromolecules to carry out batch emulsion polymerization of styrene, and the reaction time was 22.7 hours. The final conversion rate is only 66.7%
The amphiphilic macromolecular reversible addition-fragmentation chain transfer reagents used in the styrene batch emulsion polymerization system reported in other literatures, such a

Method used

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  • Poly(methyl) crylic acid-b-styrene-b-styrene/acrylonitrile) segmented copolymer latex and preparation method thereof
  • Poly(methyl) crylic acid-b-styrene-b-styrene/acrylonitrile) segmented copolymer latex and preparation method thereof
  • Poly(methyl) crylic acid-b-styrene-b-styrene/acrylonitrile) segmented copolymer latex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 (R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X, wherein the molecular weight of the St-co-AN random copolymer is 30K, and the ratio of the monomer mass of St to AN is 3:1):

[0042] 1.7 parts by weight of amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent (1) was stirred and dissolved in 80 parts by weight of water to form a uniform water phase, and then mixed with an oil phase composed of 15 parts by weight of St and 5 parts by weight of AN Pour into reactor and stir to mix. Raise the reaction temperature to 70°C, keep stirring, add 0.04 parts by weight of potassium persulfate after passing nitrogen for 5 minutes, and polymerize for 1 hour to obtain R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X block copolymer latex.

[0043] As can be seen from the data in Table 1, there is a certain deviation between the measured value of the molecular weight of the polymer and the design value, which may be caused by the polarity difference between ...

Embodiment 2

[0046] Embodiment 2 (R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X, wherein the molecular weight of the St-co-AN random copolymer is 30K, and the ratio of the monomer mass of St to AN is 3:1):

[0047] 1.7 parts by weight of amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent (1) was stirred and dissolved in 80 parts by weight of water to form a uniform water phase, and then mixed with an oil phase composed of 15 parts by weight of St and 5 parts by weight of AN Pour into reactor and stir to mix. Raise the reaction temperature to 60°C, keep stirring, add 0.04 parts by weight of ammonium persulfate after passing nitrogen for 30 minutes, and polymerize for 2 hours to obtain R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X block copolymer latex.

Embodiment 3

[0048] Embodiment 3 (R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X, wherein the molecular weight of the St-co-AN random copolymer is 30K, and the ratio of the monomer mass of St to AN is 3:1):

[0049] 1.7 parts by weight of amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent (1) was stirred and dissolved in 80 parts by weight of water to form a uniform water phase, and then mixed with an oil phase composed of 15 parts by weight of St and 5 parts by weight of AN Pour into reactor and stir to mix. Raise the reaction temperature to 70°C, keep stirring, add 0.04 parts by weight of 4,4'-azobis(4-cyanovaleric acid) after 30 minutes of nitrogen gas, and polymerize for 1 hour to obtain R-AA n1 -b-St n2 -b-(St-co-AN) n3 -X block copolymer latex.

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Abstract

The invention discloses poly(methyl) crylic acid-b-styrene-b-styrene/acrylonitrile) segmented copolymer latex and a preparation method thereof. An emulsion polymerization system is adopted, a reversible addition fragmentation chain transfer free radical polymerization technique is adopted, and a styrene and acrylonitrile monomer is added so as to prepare the copolymer latex consisting of different monomers. The preparation method is simple in process and equipment and environmental-friendly and energy-saving; due to adoption of an amphipathy macromolecule reversible addition fragmentation chain transfer reagent which has functions of both a chain transfer reagent and an emulsion agent, both good control on polymerization of the monomers is achieved, and the use of a conventional emulsion agent is avoided; the reaction is free of polymerization blocking period, the reaction speed is fast, the final conversion rate is high, the latex particle is stably increased in the process, a product is wide in molecular weight range, wide in monomer consisting range and good in application prospect in the fields such as transparent structural materials and polymer alloy commixing components.

Description

technical field [0001] The invention relates to a block copolymer material, in particular to a reversible addition-fragmentation chain transfer emulsion polymerization to prepare poly((meth)acrylic acid-b-styrene-b-styrene / acrylonitrile) block copolymer latex Methods. Background technique [0002] Styrene / acrylonitrile copolymer has a series of excellent properties, such as solvent resistance, heat resistance, transparency and good processability, etc. It is mainly used in transparent structural materials or blending components of polymer alloys. Traditional styrene / acrylonitrile copolymers are obtained by free radical polymerization using solution method, suspension method or emulsion method. Compared with other polymerization methods, emulsion polymerization uses water as the medium, which is conducive to heat transfer, environmental protection and safety, and emulsion viscosity Low, convenient for pipeline transportation and continuous production; molecular chain growth ...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F212/08C08F220/44
Inventor 黄杰高翔罗英武
Owner ZHEJIANG UNIV
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