Chemistry of Materials, 2008, 20, 3735-3739

Bài từ Tủ sách Khoa học VLOS.

Direct Preparation of High Surface Area Mesoporous SiC-Based Ceramic by Pyrolysis of a Self-Assembled Polycarbosilane-block-Polystyrene Diblock Copolymer
Direct Preparation of High Surface Area Mesoporous SiC-Based Ceramic by Pyrolysis of a Self-Assembled Polycarbosilane-block-Polystyrene Diblock Copolymer
Tạp chí Chemistry of Materials 2008 Published on Web 05/07/2008; 20 (11):3735-3739
Tác giả	Quoc Dat Nghiema,b, and Dong-Pyo Kimb
Nơi thực hiện	aSchool of Applied Chemistry and Biological Engineering, Chungnam National University, Daejeon 305-764 Korea. bDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
Từ khóa	Mesoporous SiC, Block Copolymers, Inorganic-Organic Diblock Copolymer, Self-assembly.
DOI   [ URL]  [ PDF]

Abstract

Direct pyrolysis of a self-assembled inorganic-organic block copolymer can be a promising route for fabricating the ordered ceramic nanostructures based on the achievements of organic-organic block copolymers. Here we report the synthesis of a novel polycarbosilane-block-polystyrene diblock copolymer by ring-opening living anionic polymerization in a THF and n-hexane solvent system at -48 °C. The resulting block copolymer revealed phase-separation behavior in the nanoscale to form a self-assembled nanostructure that was converted to a mesoporous ceramic phase after heating at 800 °C. The pyrolyzed ceramic product exhibited well-ordered mesoporous SiC-based ceramic structures with a high BET surface area of 1325 m² g^-1 and an average mesopore size of 7.8 nm containing a large amount of micropores.