Synthesis of Polyisobutylene Bottlebrush Polymers via Ring-Opening Metathesis Polymerization

被引：27

作者：

Yang, Bin ^{[1
]}

Abel, Brooks A. ^{[1
]}

McCormick, Charles L. ^{[1
]}

Storey, Robson F. ^{[1
]}

机构：

[1] Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA

来源：

MACROMOLECULES | 2017年 / 50卷 / 19期

基金：

美国国家科学基金会;

关键词：

POLY(ETHYLENE OXIDE) MACROMONOMERS; CYLINDRICAL MOLECULAR BRUSHES; CHAIN-END FUNCTIONALIZATION; COMB BLOCK-COPOLYMERS; CLICK CHEMISTRY; TERMINATED POLYISOBUTYLENE; RAFT POLYMERIZATION; PHOTONIC CRYSTALS; ROMP; ATRP;

D O I：

10.1021/acs.macromol.7b01655

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Polyisobutylene (PIB)-based bottlebrush polymers were synthesized via ring-opening metathesis polymerization (ROMP) of norbornene- and oxanorbornene-terminated PIB macromonomers (MM) initiated by Grubbs third generation catalyst ((H(2)IMes(2))(pyr)(2)(Cl)(2)Ru=CHPh) (G3). While both MMs reached greater than 97% conversion as measured by H-1 NMR, the rate of propagation of PIB norbornene was measured to be 2.9 times greater than that of PIB oxanorbornene MMs of similar molecular weight (MW). The slower rate of propagation of the oxanorbornene MM was attributed to interaction between the electron-rich oxygen bridge and the metal center of G3, which slowed but did not inhibit polymerization. Both types of MMs demonstrated controlled/"living" polymerization behavior, and brush polymers with MWs up to similar to 700 kg/mol with narrow dispersity (D <= 1.04) were achieved.

引用

页码：7458 / 7467

页数：10

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