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A Helical Poly(macromonomer) Consisting of a Polyacetylene Main Chain and Polystyrene Side Chains

✍ Scribed by Wei Zhang; Masashi Shiotsuki; Toshio Masuda

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
163 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A novel helical poly(macromonomer) [poly(M‐PS): absolute $\overline M _{\rm w} $ = 82 800–252 000, determined by GPC/RALLS] with a polyacetylene main chain and polystyrene (PS) side chains was synthesized by the polymerization of acetylene‐terminated M‐PS [$\overline M _{\rm n} $ = 2 000, $\overline M _{\rm w} $/$\overline M _{\rm n} $ = 1.20, $\overline {DP} _{\rm n} $ = 18] with an Rh catalyst. M‐PS was prepared by ATRP of styrene using the acetylene‐containing initiator 2‐bromo‐2‐methylpropionic acid (S)‐1‐methylpropargyl ester (l). In solutions, poly(M‐PS) exhibited an intense CD signal at 345–355 nm, indicating that it possessed a predominantly one‐handed helical conformation. Poly(M‐PS) had a stable helical conformation irrespective of solvents and temperature.

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