UV-curable epoxy systems containing hyperbranched polymers: Kinetics investigation by photo-DSC and real-time FT-IR experiments

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• 作者：Carola Esposito Corcione ; Giulio Malucelli ; Mariaenrica Frigione ; Alfonso Maffezzoli
• 关键词：Epoxy resins ; Photopolymerization ; Photocalorimetry ; Real-time spectroscopy ; Hyperbranched polymers
• 刊名：Polymer Testing
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：28
• 期：2
• 页码：157-164
• 全文大小：440 K

文摘

The effect of the presence of a hyperbranched OH-functionalized polymer (HBP) on the kinetics of cationic photopolymerization of an epoxy system was investigated employing two complementary techniques, photo-DSC and real-time FT-IR spectroscopy.

Lower rates of cross-linking reactions and higher conversion degrees were obtained in photo-DSC experiments with respect to real-time FT-IR spectroscopy. A limited amount (10 % wt) of HBP influenced to a certain extent the cure kinetics of the epoxy resin followed by RT-IR; a final conversion of epoxy groups equal to 100 % was achieved by increasing the content up to 20 % wt The addition of 10 % wt of HBP leaves the cure kinetics of the CE resin studied by p-DSC almost unchanged. By increasing the HBP content, a slightly lower reaction rate is observed at lower reaction times. The presence of the HBP produced a continuous decrease of the T_g of the UV-cured epoxy resin but only modest reductions in its thermo-oxidative stability.