Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by potassium isopropoxide

doi:10.1002/app.24665

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	Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by potassium isopropoxide
	Zhang, Yong ; Zhang, Zhijie ; Wang, Qian ; Xie, Zemin
刊名	JOURNAL OF APPLIED POLYMER SCIENCE
	2006-11-15
卷号	102 期号:4 页码:3510-3516
关键词	Anionic Polymerization Ring-opening Polymerization Polysiloxanes Activation Energy Kinetics
ISSN号	0021-8995
DOI	10.1002/app.24665
英文摘要	Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane (D-4) in bulk initiated by potassium isopropoxide was studied. Several promoters including N-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide (DMF), and diglyme were used. It is indicated that the reactions are first-order in D-4 during the initial stage of polymerization. The polymerization rate of D-4 is influenced by a number of factors, such as the nature of promoters, the molar ratio of promoter to initiator (C-p/C-i ratio), and the reaction temperatures. With the use of NMP as promoter, the polymerization rate constant at 30 degrees C is 10.482 h(-1) with the C-p/C-i ratio equal to 3.0. As the C-p/C-i ratio increases, the polymerization rate constant increases sharply and the cyclic oligomers content in polymer decreases evidently. The back-biting reaction that leads to the formation of decamethylcyclopentasiloxane (D-5) occurred in the polymerization of D-4. The rate of the D-5 formation relatively to the rate of D-4 conversion increases with the conversion of D-4. (c) 2006 Wiley Periodicals, Inc.
语种	英语
出版者	JOHN WILEY & SONS INC
WOS记录号	WOS:000241004000056
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/59495]
专题	中国科学院化学研究所
通讯作者	Zhang, Zhijie
作者单位	1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yong,Zhang, Zhijie,Wang, Qian,et al. Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by potassium isopropoxide[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2006,102(4):3510-3516.
APA	Zhang, Yong,Zhang, Zhijie,Wang, Qian,&Xie, Zemin.(2006).Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by potassium isopropoxide.JOURNAL OF APPLIED POLYMER SCIENCE,102(4),3510-3516.
MLA	Zhang, Yong,et al."Kinetics of the anionic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by potassium isopropoxide".JOURNAL OF APPLIED POLYMER SCIENCE 102.4(2006):3510-3516.