Batch-semi-batch two-stage RAFT mini-emulsion  polymerization of styrene

YANG Lei; LUO Yingwu; LI Bogeng

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Batch-semi-batch two-stage RAFT mini-emulsion polymerization of styrene

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- Batch-semi-batch two-stage RAFT mini-emulsion polymerization of styrene
- CIESC Journal Issue 8, Pages: 2149-2155(2008)
- 作者机构：
  
  1. 浙江理工大学先进纺织材料与制备技术教育部重点实验室，材料与纺织学院,浙江,杭州,310018
  2. 化学工程国家重点实验室，浙江大学化学工程与生物工程学系,浙江,杭州,310027
- 作者简介：
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- Online First：05 August 2008，
  
  Published：05 August 2008
- 稿件说明：
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YANG Lei, LUO Yingwu, LI Bogeng. Batch-semi-batch two-stage RAFT mini-emulsion polymerization of styrene[J]. CIESC Journal, 2008, (8): 2149-2155.
DOI：

YANG Lei, LUO Yingwu, LI Bogeng. Batch-semi-batch two-stage RAFT mini-emulsion polymerization of styrene[J]. CIESC Journal, 2008, (8): 2149-2155. DOI：

摘要

进行了苯乙烯的间歇-半连续RAFT细乳液聚合，考察了半连续段的起点、单体滴加速率及最终胶乳固含量的影响。结果发现：从最终胶乳的稳定性考虑，半连续聚合的起点选择在间歇聚合的高转化率时期更好;若综合考虑胶乳的稳定性、分子量及其分布、固含量、乳化剂及共稳定剂在胶乳中的残留率等因素，半连续聚合的起点可适当提前，但必须在间歇聚合成核期结束后。过早容易引起乳液的失稳;过迟会延长反应时间，降低聚合物的制备效率，导致死聚物链含量升高。聚合体系的稳定性与胶乳的固含量密切相关，最终固含量不宜超过40％。采用间歇-半连续二段聚合工艺可以制得窄分子量分布(PDI＝～1.3)，低乳化剂及共稳定剂残留量（～1.5%，质量）的高分子量聚合物(≈8×104g8226;mol-1)。

Abstract

A batch-semi-batch two-stage reversible addition-fragmentation chain transfer(RAFT) mini-emulsion polymerization of styrene was investigated.It was found that the starting point of the feeding stage (the semi-batch stage) and the solid content of the final latex were critical to reducing the amount of coagulum.The monomer feeding of the second stage should start after monomer conversion 40% of the first stage and the solid content of the final latex should remain below 40%.Under such conditions little coagulum was observed.It was concluded that the two-stage semi-batch RAFT mini-emulsion polymerization was effective to synthesize higher molecular weight polymer (～8×104 g8226;mol-1) with narrow molecular weight distribution (PDI=～1.3) and low residues of the surfactant and co-stabilizer (～1.5%

mass).

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