文献类型：期刊文献

英文题名：EXPERIMENTAL STUDIES ON THE TRANSITION FROM XEROGELS TO GLASSES FOR THE SYSTEM SIO2-PBO-B2O3 WITH ADDED DMSO USING THE THERMAL-MASS SPECTROSCOPY COUPLING TECHNIQUE

作者：LU, CW; XI, TG; YANG, XH; CHEN, YX; DU, XM; SHEN, DK; LU, WS; ZHOU, SG

机构：[1]E CHINA UNIV SCI & TECHNOL,SHANGHAI 200237,PEOPLES R CHINA

年份：1995

卷号：260

起止页码：137

外文期刊名：THERMOCHIMICA ACTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1995RZ01700012)】；

语种：英文

外文关键词：DIMETHYL SULFOXIDE (DMSO); SIO2-PBO-B2O3; TG-DTA-MS; TRANSITION FROM XEROGELS TO GLASSES

摘要：The thermal-mass spectroscopy coupling technique (TG-DTA-MS) was used to study the thermal decomposition behaviour of the transition from xerogels to glasses for the gradient refractive index materials SiO2-PbO-B2O3 with added dimethyl sulphoxide (DMSO). Compared with the TG-DTA-MS results for C2H5OH-system xerogels, the MS curves for DMSO-system xerogels show (in addition to CH3+ (m/z, 15)) the CH3O+ (mit, 31), C2H5O+ (m/z, 45), [(CH3)(2)SO](+) (mz, 78), etc., positive-ion mass spectrum peaks. This indicates that adding DMSO enables many residual OR groups to remain in the forming xerogels. This was beneficial for the condensation of the incompletely hydrolysed product and for preventing cracking of the xerogels. A preliminary study on the mechanism of thermal decomposition for DMSO-system xerogels is also given in this paper.