Single-End-Functionalized Polycyclopentene via Ring-Opening Metathesis Polymerization with Concurrent Chain Transfer

被引:1
|
作者
Abdo, Emily E. [1 ]
Cho, SeongHyuk [1 ]
Register, Richard A. [1 ]
机构
[1] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08544 USA
基金
美国国家科学基金会;
关键词
HIGHLY SELECTIVE SYNTHESIS; TRANSFER AGENTS; BLOCK-COPOLYMERS; NARROW-DISTRIBUTION; LIGHT-SCATTERING; POLYMERS; COMPATIBILIZATION; POLYETHYLENE; MACROINITIATORS; POLYSTYRENE;
D O I
10.1021/acs.macromol.9b01812
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Macromonomers bearing a functional group exclusively at one end are often synthesized by terminating a living polymerization with a suitable agent, at the cost of one initiator molecule per chain. An attractive alternative is to use chain transfer to install the functional endgroup. Herein, polycyclopentene (PCP) bearing a single styryl endgroup is synthesized by ring-opening metathesis polymerization with a well-defined Mo-based (Schrock) initiator, by employing divinylbenzene as a chain-transfer agent. High regioselectivity of the chain-transfer step, with minimal secondary metathesis of double bonds in the PCP backbone, is confirmed by mass spectral endgroup analysis. A styryl-functional PCP macromonomer copolymerizes effectively with styrene in a free-radical process (styrene reactivity ratio r(s) approximate to 1.7), producing a comb copolymer with a polystyrene backbone and PCP "teeth".
引用
收藏
页码:8079 / 8087
页数:9
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