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

Chem. J. Chinese Universities ›› 2003, Vol. 24 ›› Issue (7): 1307.

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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. 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

Abstract

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

CLC Number:

O631

TrendMD:

LIN Jian, ZHENG Shu-Ying, LI Wan-Li, YAN Ming-Fa, HUANG Jian-Ying, LIN Ming-Hua, ZOU You-Si . MN as a Rate-accelerating Additive for Styrene Polymerization Mediated by TEMPO[J]. Chem. J. Chinese Universities, 2003, 24(7): 1307.

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

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