Controlled/living radical polymerization of vinylcyclicsilazane by RAFT process and their block copolymers |
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Authors: | Quoc Dat Nghiem Chi Thanh Nguyen Dong‐Pyo Kim |
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Institution: | 1. Department of Materials Science and Engineering, KAIST, 373‐1 Guseong Dong, Yuseong Gu, Daejeon 305‐701, Korea;2. School of Applied Chemistry and Biological Engineering, Chungnam National University, 220 Kung Dong, Yuseong Gu, Daejeon 305‐764, Korea |
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Abstract: | High molecular weight poly(vinyl)silazane were synthesized successfully by reversible addition fragmentation chain transfer (RAFT) polymerization in toluene at 120 °C, using dithiocarbamate derivatives and 2,2′‐azobis‐isobutyrylnitrile (AIBN) as the RAFT agents and thermal initiator, respectively. The polymerization of a vinylcyclicsilazane oligomer with 82.5% conversion was readily controlled to increase the molecular weight from 1000 to 12,000 g/mol with a narrow polydispersity <1.5. The resulting polymer showed a high ceramic yield of 70 wt % at 1000 °C. Moreover, the approach was extended successfully to the synthesis of poly(vinyl)silazane‐block‐polystyrene as an inorganic–organic diblock copolymer. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4594–4601, 2008 |
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Keywords: | diblock copolymers inorganic– organic diblock copolymer inorganic polymers living radical polymerization poly(vinyl)silazane preceramic polymers radical polymerization RAFT process |
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