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Synthesis of poly(ethylene oxide) macroinitiators with a view to the preparation of block copolymers by radical polymerization

✍ Scribed by Ramiro Guerrero Santos; Jean G. Zilliox; Jean E. Herz; Gerard J. Beinert

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
716 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

Abstraet--Poly(ethylene oxide) radical macroinitiators with built-in benzopinacolate groups were prepared by two different methods: the first one involves a hydrosilylation reaction between ct, co-difunctional polylethylene oxide (PEO) precursors and a difunctional benzopinacolate; due to the presence of a spacer group on the benzopinacolate compound the resulting segmented PEO is rather close to a block-copolymer. The second method is based on the general duplication reaction of benzophenone groups fitted at both chain ends of a PEO precursor.

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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