Polymerization of 1,P-Epoxides Initiated by Tetraalkyl Aluminates. I. Polymerization of Ethylene Oxide in the Presence of Sodium Tetrabutyl Aluminate
作者:
E.B. Petrova,
I.M. Panayotov,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1985)
卷期:
Volume 22,
issue 9
页码: 1309-1324
ISSN:0022-233X
年代: 1985
DOI:10.1080/00222338508063335
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The polymerization of ethylene oxide (EO) initiated by NaA1Bu4is shown to proceed upon initial complex formation between monomer and initiator. In polymerization in toluene a high order of the kinetic equation with respect to initiator was found, indicating that chain propagation proceeds on dimers and trimers of the active center. An induction time of polymerization in THF is observed. It is necessary to reach a specific concentration of the NaAIBu4.EO complexes which take part in the polymerization process. The wide molecular weight distribution, the high effectivity coefficient (initiation efficiency), and the polymerization rate increase with polymer yield are evidence of a polycentric polymerization mechanism.
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