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Telechelic polystyrene obtained by degradation of polyurethane-polystyrene block copolymers

✍ Scribed by Hiroshi Kinoshita; Nobuo Tanaka; Takeo Araki; Masataka Ooka

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
527 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Polystyrene with one or two terminal hydroxyl groups was obtained in a high yield (88–90%) from polyurethane‐polystyrene block copolymers (PU‐PS). The block copolymers were prepared by radical polymerization of styrene with a polyurethane‐type macroazo initiator, and then the urethane bonds were degraded with 2‐aminoethanol. The purity of the hydroxylated polystyrene thus obtained, which consists predominantly of the dihydroxy‐telechelic component, was much higher (ca. 90%) than that of polystyrene obtained by conventional radical polymerization using the corresponding low‐molecular‐weight azo initiator 2,2′‐azobis(2‐cyanopropanol) (ca. 80% mono‐ and dihydroxylated polystyrene). Formation of a predominantly telechelic HO—PS—OH was confirmed from the results of the polyaddition reaction of the hydroxylated polystyrene with a diisocyanate.

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