PHOTOPOLYMERIZ ATION OF STYRENE WITH BENZYL N, N-DIETHYLDITHIOCARBA MYLACETATE

TIAN Shiying; DONG Jianhua; QIU Kunyuan

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PHOTOPOLYMERIZ ATION OF STYRENE WITH BENZYL N, N-DIETHYLDITHIOCARBA MYLACETATE

Research Article | 更新时间：2021-03-19

- PHOTOPOLYMERIZ ATION OF STYRENE WITH BENZYL N, N-DIETHYLDITHIOCARBA MYLACETATE
- Acta Polymerica Sinica Issue 5, Pages: 571-575(1999)
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- Published：20 October 1999，
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TIAN Shiying, DONG Jianhua, QIU Kunyuan. PHOTOPOLYMERIZ ATION OF STYRENE WITH BENZYL N, N-DIETHYLDITHIOCARBA MYLACETATE. [J]. Acta Polymerica Sinica (5):571-575(1999)
DOI：

TIAN Shiying, DONG Jianhua, QIU Kunyuan. PHOTOPOLYMERIZ ATION OF STYRENE WITH BENZYL N, N-DIETHYLDITHIOCARBA MYLACETATE. [J]. Acta Polymerica Sinica (5):571-575(1999) DOI：

摘要

研究了２-Ｎ

Ｎ-二乙基二硫代氨基甲酰氧基乙酸苄酯（ＢｚＤＣＡ）引发的苯乙烯光聚合反应

发现单体转化率和数均分子量（Ｍｎ）都随反应时间而增加

在反应时间相同时随着ＢｚＤＣＡ浓度的增加单体转化率升高而Ｍｎ降低．聚苯乙烯（ＰＳ）的Ｍｎ同单体转化率成线性关系并同理论计算值符合得较好．以２-甲基-２-亚硝基丙烷（ＭＮＰ）为捕捉剂用（ＥＰＲ）技术对聚合反应机理进行了研究．认为ＢｚＤＣＡ引发的Ｓｔ光聚合是一个“活性”聚合过程.

Abstract

Photopolymerization of styrene ( St ) with benzyl N

N-diethyldithio carbamylacetate( BzDCA) was studied.It was found that the number-average molecularweight(Mn)of polystyrene and the conversion increase with the increasing ofreaction time

respectively. The conversion also increased with the concentration of BzDCA

while Mndecreased with the increasing of BzDCAconcentration . When [ St]/[BzDCA] = 874

the Mn of PS had alinear relationship with the conversion

and agreed well with that calculated from the initial St and BzDCA concentrations and the conversions. The mechanism of the polymerization was proposed and the polymerization proceeded via a "living" radical polymerization mechanism. Under Uv irradiation

BzDCA dissociates into two kinds of radicals:carbon-Centered radical and sulfur-centered radical.The primary carbon-centered radical can initiate monomer polymerization and the sulfur-centered radical can reversibly terminate with propagating radical and form a diethyldithiocarbamate(DC) end group.

关键词

引发转移终止剂“活性”自由基聚合2-NN-二乙基二硫代氨基甲酰氧基乙酸苄酯苯乙烯电子顺磁共振谱

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