Silicon-Oxycarbide Gels and Glasses

碳氧化硅凝胶和玻璃

• 批准号: 9118797
• 负责人: Carlo Pantano
• 金额: $ 25.21万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-15 至 1995-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118797&HistoricalAwards=false
• 关键词: Silicon; Oxycarbide; Gels; Glasses

Synthesis of silicon oxycarbide gels and glasses is achieved through the hydrolysis/condensation of alkyl-substituted alkoxysilanes. It forms a gel whose subsequent heat-treatment in an inert atmosphere creates an x-ray amorphous glass that contains both Si-O and Si-C bonds. The glass is often black due to the additional presence of a highly dispersed form of polyaromatic, pyrolytic, and/or amorphous carbon. A primary objective of this project is to characterize, in detail, the ternary Si-O-C system, and especially to determine the molecular structure of the excess carbon, its relationship to the oxycarbide network, and its effect on the thermochemical stability of the glass. NMR, Raman spectroscopy, and TEM will be used to characterize the glasses. %%%% Oxycarbide glasses exhibit enhanced properties. Characterization of the glass structure is essential for future exploitation of these unique glasses. This program is expected to yield valuable information and possibly to provide a basis for developing new reinforced composite materials, by sol-gel methods.

碳氧硅凝胶和玻璃的合成是通过烷基取代的烷氧基硅烷的水解/缩合来实现的。它形成一种凝胶，随后在惰性气氛中进行热处理，生成一种同时包含Si-O和Si-C键的x射线非晶态玻璃。玻璃通常是黑色的，这是由于另外存在高度分散的聚芳烃、热解和/或无定形碳。这个项目的一个主要目标是详细地表征Si-O-C三元系统，特别是确定过剩碳的分子结构，它与碳氧化网络的关系，以及它对玻璃热化学稳定性的影响。将使用核磁共振、拉曼光谱和透射电子显微镜对玻璃进行表征。%氧化碳化物玻璃具有增强的性能。对玻璃结构的表征对于未来开发这些独特的玻璃至关重要。该程序有望提供有价值的信息，并可能为利用溶胶-凝胶法开发新的增强复合材料提供基础。