Rheological behaviour during UV-curing of a star-branched polyester

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, BoltornTM 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 50 .C; films can be formed and cured below 80 .C. 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.


Published in:
Progress in Organic Coatings, 44, 1, 63-67
Year:
2002
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 Record created 2006-06-26, last modified 2018-03-17

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