Structural analysis of poly(dimethylsiloxane) modified silica xerogels

A new type of inorganic-organic hybrid material incorporating poly(dimethylsiloxane) (PDMS) in tetraethoxysilane (TEOS) based glassy gels has been produced by a sol–gel process. SAXS and SEM studies indicate that these PDMS modified silica xerogels possess multiple size-scale morphologies, ranging f...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1999, Vol.243 (1), p.61-69
Main Authors: Guo, Ling, Hyeon-Lee, Jingyu, Beaucage, Gregory
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
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Summary:A new type of inorganic-organic hybrid material incorporating poly(dimethylsiloxane) (PDMS) in tetraethoxysilane (TEOS) based glassy gels has been produced by a sol–gel process. SAXS and SEM studies indicate that these PDMS modified silica xerogels possess multiple size-scale morphologies, ranging from Ångstroms to micrometers. The multiple-level hybrid materials show improved structural integrity relative to pure sol–gel glasses (xerogels). The effect of reaction time, water content, as well as content and molecular weight of PDMS on the structure of such materials were studied. These processing variables affect the relative rates of hydrolysis and condensation reactions, and consequently change the microstructure of the final product.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00819-9