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Synthesis of the model macroinitiators of free radical polymerization and their application for the preparation of block copolymers

✍ Scribed by Elena Kalyuzhnaya; Gladys De Los Santos Villareal; Luis E. Elizalde Herrera; Ramiro Guerrero Santos

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 736 KB
Volume: 61
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960808)61:6<1055::aid-app20>3.0.co;2-u

No coin nor oath required. For personal study only.

✦ Synopsis

A series of polystyrenes having low molecular weight (4600-23,100) and narrow molecular weight distribution and functionalized with a benzophenone group a t one or both ends of the chain have been prepared through anionic polymerization. T h e n the terminal benzophenone groups have been transformed into l,Z-bis(tri-methylsily1oxy)tetraphenylethane (or benzopinacolate) groups by the duplication reaction with free benzophenone in the presence of chlorotrimethylsilane and hexamethylphosphorous triamide ( H M P T ) or hexamethylphosphoramide (HMPA), producing model thermal macroinitiators of free radical polymerization with well-defined structure. Polymerization of MMA initiated by these macroinitiators was carried out yielding poly(styrene-b-methyl-methacrylate) (PS-b-PMMA).

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