Cite as:
Deng Z, Wang J, Wei J, Bao Y, Shen J, Chen L, Wu A, 2001, "Thermal conductivity and modification of silica aerogels prepared with polymeric precursors" High Temperatures - High Pressures 33(2) 135 – 140

Thermal conductivity and modification of silica aerogels prepared with polymeric precursors

Zhongsheng Deng, Jue Wang, Jiandong Wei, Yuping Bao, Jun Shen, Lingyan Chen, Aimei Wu

Received 20 December 1999

Abstract. Modified silica aerogels were prepared with polyethoxydisiloxanes (E-40) followed by silylation of alcogels and ethanol supercritical drying. Trimethylchlorosilane (TMCS) and dimethyldimethoxysilane (DMMOS) were used as the silylation agents. Transmission electron microscopy (TEM) and nitrogen sorption techniques were used to characterise the modified and unmodified silica aerogels. The existence of the methyl groups on the internal surface of aerogels was observed with an infrared and ²⁹Si magic-angle spinning nuclear magnetic resonance spectrometer (MAS-NMR). The thermal conductivities of silica aerogels were measured as a function of air pressure and mixture (air and water vapour) pressure, respectively. The results were discussed by considering the adsorption of water vapour by the silica aerogels.

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