Synthesis and characterization of block copolymer/ceramic precursor nanocomposites based on a polysilazane

被引:22
作者
Garcia, CBW [1 ]
Lovell, C [1 ]
Curry, C [1 ]
Faught, M [1 ]
Zhang, YM [1 ]
Wiesner, U [1 ]
机构
[1] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14850 USA
关键词
block copolymers; Ceraset; polysilazane; self-assembly; mesostructure; nanocomposites;
D O I
10.1002/polb.10705
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The amphiphilic block copolymer poly(isoprene-block-ethylene oxide) was used as a structure-directing agent for a polysilazane preceramic polymer commercially known as Ceraset. Two block copolymers of different molecular weights and poly(ethylene oxide) weight fractions with body-centered cubic sphere and hexagonal cylinder morphologies were used. To both polymers, 50 wt % of the silazane oligomer (Ceraset) was added. The resulting composites were cast into films and characterized by small-angle X-ray scattering and transmission electron microscopy. The silazane was chemically compatible with the poly(ethylene oxide) microdomains of the block copolymer, and this resulted in a swelling of those domains. After the cooperative self-assembly of the block copolymer and Ceraset, for both systems the structure was permanently set in the lamellar morphology by the crosslinking of the silazane oligomer with a radical initiator at 120degreesC. These results suggest that the use of block copolymer mesophases may provide a simple and easily controlled pathway for the preparation of various high-temperature SiCN-type ceramic mesostructures. (C) 2003 Wiley Periodicals, Inc.
引用
收藏
页码:3346 / 3350
页数:5
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