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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthesis of block copolymers from p-acetoxystyrene and isoprene by "living" free radical polymerization

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Author(s):
Moreira, J. C. ; Wang, S. H. [2]
Total Authors: 2
Document type: Journal article
Source: POLIMEROS-CIENCIA E TECNOLOGIA; v. 14, n. 3, p. 171-175, jul.-set. 2004.
Field of knowledge: Engineering - Materials and Metallurgical Engineering
Abstract

In this work we show the synthesis of homopolymers and diblock copolymers of p-acetoxystyrene and isoprene by using TEMPO-modified free radical initiator. The GPC analyses have shown an increase in the molar masses and in the polydispersity of the copolymers in comparison with their corresponding homopolymer. Poly(p-acetoxystyrene-b-isoprene) were prepared with good control of composition and molar mass up to 94,500 a.m.u. DSC analyses have shown a glass transition temperature decrease of 5-18 °C for the poly(p-acetoxystyrene) segment in copolymers compared to that observed for the parent homopolymer. The glass transition temperature of polyisoprene segment in copolymers remained similar to those observed for the homopolymers (-67 to -55 °C). (AU)