PYROLYTIC CONVERSION OF METHYLSILANE AND VINYLSILANE POLYMERS TO SI-C CERAMICS

被引：51

作者：

HURWITZ, FI ^{[1
]}

KACIK, TA ^{[1
]}

BU, XY ^{[1
]}

MASNOVI, J ^{[1
]}

HEIMANN, PJ ^{[1
]}

BEYENE, K ^{[1
]}

机构：

[1] CLEVELAND STATE UNIV,CLEVELAND,OH 44115

来源：

JOURNAL OF MATERIALS SCIENCE | 1995年 / 30卷 / 12期

关键词：

D O I：

10.1007/BF01209227

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Poly(methylsilane) and poly(vinylsilane) were synthesized using a titanocene catalyst, and their pyrolytic conversion to ceramics was followed using a combination of thermal analysis and infrared spectroscopy. The two polymers have distinctly different backbone structures, as determined by Si-29 NMR; methylsilane polymerizes to a polysilane, while vinylsilane polymers have a predominately polycarbosilane backbone, with some polysilane structure as well. The pyrolysis path and char yield were dependent primarily on backbone structure, with little influence of polymer molecular weight. The majority of the weight loss on conversion occurs below 650 degrees C, although bond rearrangement continues to 1400 degrees C. Poly (vinylsilane) produced a carbon-rich Si-C ceramic in which the carbon was dispersed on a sufficiently fine level to show resistance to oxidation on heating in air to 1400 degrees C. Copolymerization of methyl- and vinylsilane produced stoichiometric SiC; however, polymers of methylsilane were sensitive to oxygen incorporation and sometimes pyrophoric. Polymerization of vinylsilane with disilylethane permitted control of theology and imparted thermoset behaviour.

引用

页码：3130 / 3136

页数：7

共 25 条

[1] COMPOSITION MICROSTRUCTURE PROPERTY RELATIONSHIPS IN CERAMIC MONOFILAMENTS RESULTING FROM THE PYROLYSIS OF A POLYCARBOSILANE PRECURSOR AT 800 TO 1400-DEGREES-C [J].