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Issue 17, 2013
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Gradient copolymers of styrenemethyl acrylate and styreneacrylic acid by organostibine-mediated controlled/living radical polymerization and their glass transition behaviors

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Abstract

Gradient copolymers of styrenemethyl acrylate (poly(St-grad-MA)) were synthesized by semi-batch organostibine-mediated controlled/living radical polymerization (SBRP) in bulk at 60 °C. The number-average molecular weights of the copolymers increase linearly with the total conversion, and the polydispersity indices of all the final copolymers are less than 1.20. The relationships of the cumulative composition (Fcum) and instantaneous composition (Finst) with the degree of polymerization demonstrate the formation of different gradient chain structure and composition of copolymers. Furthermore, amphiphilic gradient copolymers of styreneacrylic acid (poly(St-grad-AA)) with a small amount of residual MA units were achieved through the hydrolysis of poly(St-grad-MA) under basic conditions. The glass transition temperature (Tg) behaviours of poly(St-grad-MA) and poly(St-grad-AA) were compared in detail. Tg values of poly(St-grad-MA) increase with increasing Fcum,St, while poly(St-grad-AA) has the maximum Tg value and both the two kinds of copolymers have the maximum Tg breadth values with Fcum,St range of 0.4–0.5. The Tg breadth values of poly(St-grad-AA) copolymers are larger than that of the corresponding poly(St-grad-MA) due to the more strongly segregating components of St–AA than St–MA. The typical wide Tg breadths of all the copolymers further prove their gradient structures.

Graphical abstract: Gradient copolymers of styrene–methyl acrylate and styrene–acrylic acid by organostibine-mediated controlled/living radical polymerization and their glass transition behaviors

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Publication details

The article was received on 23 Apr 2013, accepted on 05 Jun 2013 and first published on 06 Jun 2013


Article type: Paper
DOI: 10.1039/C3PY00484H
Citation: Polym. Chem., 2013,4, 4639-4647
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    Gradient copolymers of styrenemethyl acrylate and styreneacrylic acid by organostibine-mediated controlled/living radical polymerization and their glass transition behaviors

    J. Zhang, J. Li, L. Huang and Z. Liu, Polym. Chem., 2013, 4, 4639
    DOI: 10.1039/C3PY00484H

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