INFLUENCE OF MONOMER COMPOSITION ON THE CHAIN TRANSFER COEFFICIENT IN METHYL METHACRYLATE/BUTYL ACRYLATE RAFT COPOLYMERIZATION

ZHANG Xiaojuan; GAO Jing; LUO YingWu; LI Bogeng

doi:10.3724/SP.J.1105.2008.00083

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INFLUENCE OF MONOMER COMPOSITION ON THE CHAIN TRANSFER COEFFICIENT IN METHYL METHACRYLATE/BUTYL ACRYLATE RAFT COPOLYMERIZATION

Research Bulletin | 更新时间：2021-03-19

- INFLUENCE OF MONOMER COMPOSITION ON THE CHAIN TRANSFER COEFFICIENT IN METHYL METHACRYLATE/BUTYL ACRYLATE RAFT COPOLYMERIZATION
- Acta Polymerica Sinica Issue 1, Pages: 83-87(2008)
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- DOI：10.3724/SP.J.1105.2008.00083
  CLC：
- Published：20 January 2008，
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ZHANG Xiaojuan, GAO Jing, LUO YingWu, LI Bogeng. INFLUENCE OF MONOMER COMPOSITION ON THE CHAIN TRANSFER COEFFICIENT IN METHYL METHACRYLATE/BUTYL ACRYLATE RAFT COPOLYMERIZATION. [J]. Acta Polymerica Sinica (1):83-87(2008)
DOI：

ZHANG Xiaojuan, GAO Jing, LUO YingWu, LI Bogeng. INFLUENCE OF MONOMER COMPOSITION ON THE CHAIN TRANSFER COEFFICIENT IN METHYL METHACRYLATE/BUTYL ACRYLATE RAFT COPOLYMERIZATION. [J]. Acta Polymerica Sinica (1):83-87(2008) DOI： 10.3724/SP.J.1105.2008.00083.

摘要

采用Z基团为—CH2C6H5的RAFT试剂为链转移剂，AIBN为引发剂，60℃下进行甲基丙烯酸甲酯/丙烯酸丁酯(MMA/BA)的本体RAFT共聚合，并用GPC法测算不同单体组成下低聚物RAFT的链转移常数(Ctr).实验表明，对BA的均聚合，Ctr高达116，但对MMA的均聚合，Ctr约为0.1.在共聚体系中，Ctr与fMMA之间为非线性关系，随着fMMA的增加呈下降趋势.Ctr随单体组成的变化规律可以很好地解释不同单体组成下RAFT共聚合中分子量及其分布随转化率变化的规律.

Abstract

The bulk copolymerization of butyl acrylate (BA) and methyl methacrylate (MMA) in the presence of the RAFT agent with Z=—CH2C6H5 and 2

2′Azobis(isobutyronitrile)(AIBN) as an initiator was carried out at 60℃.The chain transfer coefficients (Ctr) at different monomer compositions were determined by the GPC peak resolution method.In the BA homopolymerization

Ctr was up to 116 while it was about 0.1 in the MMA homopolymerization.Since Ctr was too low

the homopolymerization of MMA mediated by the RAFT agent was out of control.In the copolymerization systems

Ctr showed a nonlinear decrease with the increasing of MMA compositions.When a small fraction of BA was added to an MMA polymerization system

the polymerization became well controlled with PDI around 1.2 at the end of the polymerization.The changing trend of Ctr with monomer compositions well explained the profiles of the molecular weight and its distribution against conversion with different monomer compositions.

关键词

RAFT共聚链转移常数分子量分子量分布

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