高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (7): 1307.

• 论文 • 上一篇    下一篇

TEMPO存在下丙二腈对苯乙烯聚合的加速作用研究

林建1, 郑淑英2, 李万利1, 颜明发1, 黄剑莹1, 林明华1, 邹友思1   

  1. 1. 厦门大学材料科学系, 固体表面物理化学国家重点实验室, 厦门 361005;
    2. 福建宁德高等专科学校化学系, 宁德 352100
  • 收稿日期:2002-05-16 出版日期:2003-07-24 发布日期:2003-07-24
  • 通讯作者: 邹友思(1954年出生),男,教授,主要从事可控聚合研究.E-mail:yszou@jingxian.xmu.edu.cn E-mail:yszou@jingxian.xmu.edu.cn
  • 基金资助:

    固体表面物理化学国家重点实验室基金(批准号:1130)资助

MN as a Rate-accelerating Additive for Styrene Polymerization Mediated by TEMPO

LIN Jian1, ZHENG Shu-Ying2, LI Wan-Li1, YAN Ming-Fa1, HUANG Jian-Ying1, LIN Ming-Hua1, ZOU You-Si1   

  1. 1. State Key Laboratory for Physical Chemistry of the Solid Surface, Department of Material Science, Xiamen University, Xiamen 361005, China;
    2. Department of Chemistry, Ningde Teachers College, Ningde 352100, China
  • Received:2002-05-16 Online:2003-07-24 Published:2003-07-24

摘要: 在少量丙二腈存在下,苯乙烯在稳定自由基TEMPO作用下的聚合速率显著增加,分子量分布较窄,且随转化率增大而增大,具有活性聚合特征.丙二腈与TEMPO的摩尔比在4:1时加速效果较好,在125℃下聚合1h转化率可达到70%,分子量可达到105,且反应温度降低到110℃.1HNMR分析表明,丙二腈在反应中起催化剂作用,通过削弱碳氮键可以提高转化速度,还可明显降低聚合温度.

关键词: 丙二腈, 活性自由基聚合, 加速剂, TEM PO

Abstract: Styrene polymerization mediated by TEMPO was distinctly accelerated by the addition of small amounts of malononitrile(MN). The polymerization proceeded in a living fashion as indicated by the increase in molecular weight with time and conversion and relatively low polydispersities. It was found that the polymerization rate was so quick that the conversion reached 70% within 1 h at 125 ℃ when n(MN): n(TEMPO) equaled to 4:1. Moreover the molecular weight could be controlled to 105 and the reaction temperature could be reduced to 110 ℃. Analysis of 1HNMR showed that MN only acted a catalyst to enhance the polymerization rate and reduce clearly the temperature by weakening the bond of C-O.

Key words: Malononitrile(MN), Living free radical polymerization, Rate-accelerating additive, TEMPO

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