An improved mimetic compound for styrene "living" free radical polymerization. An initiator containing the "penultimate" unit

被引：42

作者：

Skene, WG ^{[1
]}

Scaiano, JC ^{[1
]}

Yap, GPA ^{[1
]}

机构：

[1] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada

来源：

MACROMOLECULES | 2000年 / 33卷 / 10期

关键词：

D O I：

10.1021/ma991924d

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A new thermal initiator for living free radical polymerization (LFRP) has been synthesized photochemically by coupling of the free radical TEMPO with the 1,3-aiphenyl-1-propyl radical. This initiator (4), which contains the penultimate monomer unit, is a much better mimetic compound than similar compounds derived from radicals with a single styrene moiety, such as the 2-phenylethyl radical (which yields adduct 2). In particular, 4 does not yield any disproportionation products, while other model compounds usually do. This is attributed to the lowest energy conformation of 4, which places the beta-hydrogen atoms in an unfavorable stereoelectronic arrangement to give disproportionation products. It is anticipated that the same situation will prevail in the polymer, and it is instrumental in determining the low polydispersities achievable with LFRP. This report includes a detailed study of the properties of 4, including its thermal decomposition and relevant free radical kinetics, as well as a comparison of the rotational barrier of 4 with that of 2.

引用

页码：3536 / 3542

页数：7

共 41 条

[21] ''Living'' free radical polymerization: A unique technique for the preparation of controlled macromolecular architectures [J].