Journal of Polymer Science: PART A: Polymer Chemistry, 2008, 46, 4594

Bài từ Tủ sách Khoa học VLOS.

Controlled/Living Radical Polymerization of Vinylcyclicsilazane by RAFT Process and Their Block Copolymers
Controlled/Living Radical Polymerization of Vinylcyclicsilazane by RAFT Process and Their Block Copolymers
Tạp chí Journal of Polymer Science: Part A: Polymer Chemistry 2008 May 28 2008; 46 (13):4594-4601
Tác giả	Quoc Dat Nghiema, Chi Thanh Nguyenb, and Dong-Pyo Kimb
Nơi thực hiện	aDepartment of Materials Science and Engineering, KAIST, 373-1 Guseong Dong, Yuseong Gu, Daejeon 305-701, Korea bSchool of Applied Chemistry and Biological Engineering, Chungnam National University, 220 Kung Dong, Yuseong Gu, Daejeon 305-764, Korea
Từ khóa	Diblock copolymers; inorganic–organic diblock copolymer; inorganic polymers; living radical polymerization; poly(vinyl)silazane; preceramic polymers; radical polymerization; RAFT process
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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 ^oC, using dithiocarbamate derivatives and 2,20-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 ^oC. Moreover, the approach was extended successfully to the synthesis of poly(vinyl)silazane-block-polystyrene as an inorganic–organic diblock copolymer. VVC 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4594–4601, 2008