Chemistry of Materials, 2008, 20, 3735-3739
| 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[sửa]
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.
