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Hydrolysis of 4-acetoxystyrene polymers prepared by atom transfer radical polymerization

✍ Scribed by Xianyi Chen; Katja Jankova; Jørgen Kops; Walther Batsberg

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
127 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

Hydrolysis of 4-acetoxystyrene polymers prepared by atom transfer radical polymerization was carried out under various reaction conditions. It was found that hydrazinolysis of 4-acetoxystyrene homopolymers, random and block copolymers with styrene in 1,4-dioxane, afforded the corresponding narrow dispersed materials with phenolic groups which were substantially free from crosslinkages. Gel permeation chromatographic (GPC) analysis of these polymers revealed different extents of molecular weight distribution (MWD) broadening for the hydrolysis products for the different structures. On the other hand, by NaOH catalyzed deprotection, the 4-acetoxystyrene polymers including triblock copolymer poly(4-acetoxystyrene-b-isobutylene-b-4-acetoxystyrene) suffered from some degrees of coupling or even gelation, except for poly-(styrene-b-4-acetoxystyrene-b-styrene) which also by this method could be conveniently converted to its phenolic product.

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✍ Veerle Coessens; Krzysztof Matyjaszewski 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 130 KB 👁 2 views

Polymers prepared by atom transfer radical polymerization (ATRP) contain end groups defined by the initiator used. Alkyl halides, used as initiators, lead to polymers with an alkyl group at one end and a halide as the other chain end. Using functionalized initiators such as 2-hydroxyethyl 2-bromopro