Journal
PROGRESS IN ORGANIC COATINGS
Volume 44, Issue 1, Pages 63-67Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0300-9440(01)00242-9
Keywords
aliphatic polyester; dendritic; gel point; powder coatings; star polymer; UV
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Using a rheometer coupled with an UV-light generator, the viscoelastic behaviour during the fast cure of star-branched polyester is investigated. The 32 arm star polymers consist of a hyperbranched polyester core, Boltorn(TM) and linear grafts of poly(E-caprolactone) (degree of polymerisation: 20-52) with methacrylate end groups. The resins are crystalline and the melting points range from 34 to 50degreesC; films can be formed and cured below 80degreesC. The crossover of G' and G was used as the gel point. The time to reach the gel point, a few seconds, increases linearly with molecular weight. (C) 2002 Elsevier Science B.V. All rights reserved.
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