Some novel accelerating agents for nitroxide-mediated living free-radical polymerization

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	Some novel accelerating agents for nitroxide-mediated living free-radical polymerization
	Lin,MH ; Lin,J ; Huang,JY ; Dai,LZ ; Zou,YS ; Lin,Q ; Lin MH(林梦海)
刊名	http://dx.doi.org/10.1002/pola.20840
	2005-11-01
关键词	RATE ENHANCEMENT NARROW POLYDISPERSITY STYRENE INITIATOR COPOLYMERIZATION BLOCK
英文摘要	Malononitrile (MN), trifluoroacetic acid anhydride, acetylacetone, acetoacetic ester, and diethyl malonate have been identified as novel rate-accelerating additives for nitroxide-mediated living free-radical polymerization. Among these additives, MN has the greatest accelerating effect. Adding MN at an MN/2,2,6,6-tetramethylpiperidine-oxyl (TEMPO) molar ratio of 4.0 results in a nearly 20 times higher rate of polymerization of styrene (St), and adding MN at an MN/TEMPO molar ratio of 2.5 results in a nearly 15 times higher rate of copolymerization of St and methyl methacrylate. The polymerization of St proceeds in a living fashion, as indicated by the increase in the molecular weight with time and conversion and the relatively low polydispersity. The polymerization rate of St is so quick that the conversion reaches 70% within 1 h at 125 degrees C when the molar ratio of MN to TEMPO is 4:1. Moreover, the reaction temperature can be reduced to 110 degrees C. A possible explanation for this effect is that the formation of hydrogen bonds between the MN and TEMPO moiety weakens the C-ON bond at the end of the polymer chain. (c) 2005 Wiley Periodicals, Inc.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/62498]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Lin,MH,Lin,J,Huang,JY,et al. Some novel accelerating agents for nitroxide-mediated living free-radical polymerization[J]. http://dx.doi.org/10.1002/pola.20840,2005.
APA	Lin,MH.,Lin,J.,Huang,JY.,Dai,LZ.,Zou,YS.,...&林梦海.(2005).Some novel accelerating agents for nitroxide-mediated living free-radical polymerization.http://dx.doi.org/10.1002/pola.20840.
MLA	Lin,MH,et al."Some novel accelerating agents for nitroxide-mediated living free-radical polymerization".http://dx.doi.org/10.1002/pola.20840 (2005).