Mechanical and thermal properties of UV cured mixtures of linear and hyperbranched urethane acrylates |
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Authors: | Enis S D?unuzovi? Srba V Tasi? Branislav R Bo?i? Jasna V D?unuzovi? Branko M Dunji? Katarina B Jeremi? |
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Affiliation: | 1. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;2. Bayer Ltd., Omladinskih brigada 88b, 11000 Belgrade, Serbia;3. Colorsim, Tsentralna 38, Rivne region, PGT Klevan, Ukraine;4. Institute of Chemistry, Technology and Metallurgy (ICTM)-Center of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia |
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Abstract: | The properties of urethane acrylate resin mixtures based on the linear and hyperbranched aliphatic polyesters were examined. Linear polyester was synthesized from neopentil glycol and adipic acid. Hyperbranched polyester of the third generation was synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylol propane. The modification of 60% of hyperbranched aliphatic polyester OH end groups was carried out with isononanoic acid or with soybean fatty acids. Two hyperbranched urethane acrylates, with the same degree of acrylation, and one linear urethane acrylate were obtained by reaction of appropriate polyester and isophorone diisocyanate and 2-hydroxyethyl acrylate. The influence of added amount of HUA and nature of non-acrylic end groups on the rheological, mechanical and thermal properties of the uncured and UV cured mixtures diluted with 20 wt.% hexanediol diacrylate was examined. The nature of non-acrylic end groups have great effect on the interaction between linear and hyperbranched urethane acrylates, which further has a crucial influence on the examined properties of uncured and UV cured mixture samples. |
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Keywords: | Urethane acrylate Hyperbranched polyester Soybean fatty acids Isononanoic acid UV curing Dynamic mechanical properties |
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