期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 220, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201900377
关键词
cationic mechanisms; cobalt; epoxides; polyethers; ring-opening polymerization
资金
- National Natural Science Foundation of China (NSFC) [21690073, 21871036]
- Program for Chang Jiang Scholars and Innovative Research Team in University from Chinese Ministry of Education [IRT-17R14]
Polyethers are an important class of polymers that find numerous applications. Ring-opening polymerization of various 1,2-disubstituted epoxides initiating a commercial, and well-defined Co-III-Salen complex is investigated in this paper. Remarkable reactivity (0.01% Co-III loadings, TOF up to 19200 h(-1)) is discovered in this transformation. High molecular weight polymers (up to 80 kg mol(-1)) are produced. In particular, polyether from ring-opening polymerization of 1,4-dihydronaphthalene oxide exhibits a glass transition temperatures (T-g) of up to 108 degrees C. By investigating the relationship between polymerization reactivity and counter ion in the Co-III complex, as well as the properties of the resultant polyethers, a cationic mechanism through an oxonium species is proposed.
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