Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-03-07

Journal: POLYMER CHEMISTRY

Included Journals: EI、SCIE

Volume: 8

Issue: 9

Page Number: 1449-1453

ISSN: 1759-9954

Abstract: The synthesis of stereoregular star polymers, including star cis-1,4-PB, star cis-1,4-PB-ran-3,4-PI and star cis-1,4-PB-b-syn-PS, through an "arm-first" approach via a living coordination polymerization mechanism is reported in this work for the first time. The half-sandwich scandium catalyst ( C5Me4SiMe3) Sc( CH2SiMe3)(2() THF) activated with [ Ph3C][B(C6F5)(4)] is used herein. Star cis-1,4-PB compounds with various arm lengths and arm numbers ranging from 1.0 x 10(4) to 6.5 x 104 g mol(-1) and 7.6 to 26.4, respectively, are produced by tuning the polymerization parameters. Additionally, the stereoregular star cis-1,4-PB-ran-3,4-PI and star cis-1,4-PB-b-syn-PS are also explored in the same way with average arm numbers of 21.4 and 16.5 and 35% and 41% star yield, respectively.