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DOI: 10.1039/A903071I (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 1687-1691

Self-reinforcing hydrogels comprised of hydrophobic methyl methacrylate macromers copolymerised with either N-vinyl-2-pyrrolidone or 2-hydroxyethyl acrylate

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Lisa M. Muratore, Karen Steinhoff and Thomas P. Davis

Abstract

Methyl methacrylate macromers have been synthesised by catalytic chain transfer polymerization with Mn values ranging from 565 to 25 392. These macromers were subsequently copolymerized with either 2-hydroxyethyl acrylate or N-vinyl-2-pyrrolidone, in bulk, by γ-radiation to yield xerogel materials. Copolymerization was confirmed by NMR analyses and by subsequent aqueous extraction of the resultant copolymers. The xerogels containing 2-hydroxyethyl acrylate and macromers below 10 000 (Mn) molecular weight yielded popcorn polymers. All other xerogel materials were transparent. On swelling in deionised water, compositions containing 2-hydroxyethyl acrylate became white and opaque indicating phase segregation. In contrast all of the hydrogels based on N-vinyl-2-pyrrolidone retained transparency. Hydrogels were formed that had significantly higher Young's moduli than hydrogels based on random copolymers of equivalent composition.

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