Synthesis and UV curing kinetics of rapidly UV‐curable hyperbranched polycarbosiloxanes |
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| Authors: | Sheng‐Jie Wang Xin Liu Jie Kong Wei Tian Xiao‐Dong Fan Hai Xu Jian‐Ren Lu |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, PR China;2. Center for Bioengineering and Biotechnology, China University of Petroleum, Qingdao 266555, PR China;3. Department of Applied Chemistry, Northwestern Polytechnical University, Xi'an 710072, PR China;4. Biological Physics Group, School of Physics and Astronomy, University of Manchester, Schuster Building, Manchester M13 9JP, UK |
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| Abstract: | Hyperbranched polycarbosiloxanes with peripheral photo‐crosslinkable groups were synthesized through controllable hydrosilylation reaction from A2‐type and CB3‐type monomers. The polymerization of the monomer pairs was monitored using Fourier transform infrared spectroscopy, from which it was found that vinyl silane and methacrylate groups reacted with hydride silane from the beginning of the reaction. The results thus suggest a step‐by‐step polymerization rather than a two‐step process for this system. The polycarbosiloxanes could be cured rapidly in either nitrogen or air atmosphere, this feature making them attractive for potential application as precursors of advanced ceramic devices with complex structures. The effects of light intensity, reaction temperature and atmosphere on the UV curing rate (Rp) and conversion (α) of the photo‐crosslinkable groups were characterized carefully, and the curing kinetics was also investigated systematically. The results show that Rp and α increased with an increase of light intensity or temperature, and that the inhibiting effect of oxygen in air could be suppressed by enhancing the irradiation intensity. Copyright © 2010 Society of Chemical Industry |
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| Keywords: | hyperbranched polycarbosiloxane A2 + CB3 approach UV curing kinetics |
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