Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 86, Issue 9, Pages 2296-2306Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.11221
Keywords
biodegradable; photocrosslinking; poly(epsilon-caprolactone)s; ring-opening polymerization; functionalization of polymers
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The purpose of this research was to synthesize and characterize a novel class of four-arm, star-shape biodegradable polymers having double-bond functionality as a precursor for free-radical polymerization, with unsaturated monomers or macromers or photocrosslinking for network formation. The synthesis involved two basic steps. First, hydroxyl-functionalized four-arm poly(epsilon-caprolactone)s (PPCL-OH) were synthesized by the ring-opening polymerization of epsilon-caprolactone in the presence of pentaerythritol and stannous octoate. Second, double-bond-functionalized four-arm poly(epsilon-caprolactone)s (PPCL-Ma) were synthesized by reacting PPCL-OH with maleic anhydride in the melt at 130degreesC. Quantitative conversion of hydroxyl functionality in PPCL-OH to double-bond functionality was achieved for low molecular weight PPCL-OH. Both the PPCL-OH and the PPCL-Ma were characterized by FTIR, H-1-NMR, C-13-NMR, SEC, and DSC. The capability of the double-bond-functionalized four-arm poly(epsilon-caprolactone)s (PPCL-Ma) to form network structures was preliminarily shown by photocrosslinking PPCL-Ma. (C) 2002 Wiley Periodicals, Inc.
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