Anionic polymerization of MMA initiated by organolithium/cuprum diphenylphosphide (Ph2PCu) and synthesis of its block copolymer.

Autor: Lu, Jianmin, Huang, Zengbiao, Han, Bingyong, Wu, Yixian, Yang, Wangtai
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Zdroj: Journal of Applied Polymer Science; Aug2012, Vol. 125 Issue 3, p2085-2091, 7p
Abstrakt: Organolithium/cuprum diphenylphosphide (Ph2PCu) was used as a novel initiator to polymerize methyl methacrylate (MMA) and styrene in tetrahydrofuran (THF) at −50 to −10°C. The polymerizations initiated by n-BuLi/Ph2PCu, Ph2PCu/Li (Ip)3-6Li/Ph2PCu, and PSLi/Ph2PCu were studied in detail. The polymerization of alkyl methacrylate initiated by n-BuLi/Ph2PCu showed a narrow molecular weight distribution (MWD) (1.08-1.25) and 100% initiation efficiency. The experimental number average molecular weight increased linearly with increasing [MMA]/[ n-BuLi/Ph2PCu]. After the second monomer addition, the molecular weight increased proportionally while the MWD remained constantly narrow. These results reveal partial living characteristics. Ph2PCu/Li (Ip)3-6Li/Ph2PCu showed a similar behavior and was used to prepare PGMA-b-PBMA-b-PMMA-b-PBMA-b-PGMA successfully. The initiation efficiency of n-BuLi/Ph2PCu for styrene was low. The macromolecular initiator PSLi/Ph2PCu was prepared and PS-b-PMMA with a narrow distribution was synthesized. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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