Effect of Inorganic Components on Thermal Stability of Methylsiloxane-Based Inorganic/Orgnaic Hybrids

摘要

The thermal decomposition behavior of methylsiloxane-based inorganic/organic hybrids containing an inorganic component derived from metal alkoxides such as Si(OCH_3)_4,Al(OZZZZZ~sC_4H_9)_3,Ti(O~sC_3H_7)_4 and Nb(OC_2H_5)_5 was investigated by means of thermogravimetric and differential thermal analysis (TG-DTA),Fourier transform infrared (FT-IR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy.The decomposition temper-ature of methyl groups in methylsiloxane-based inorganic/organic hybrids containing an inorganic component derived from metal alkoxides was higher than that in the methylsiloxane-based inorganic/organic hybrid prepared from only CH_sSKOC_2H_5X_3 In particular,when incorporating Nb and Ti inorganic components,methyl groups in methylsiloxane-based inorganic/organic hybrids decomposed at about 100 and 200 deg C higher temperatures,respec-tively,than those in the methylsiloxane-based inorganic/organic hybrid prepared from only CH_3Si(OC_2H_5)_3.The incorporation of an inorganic component other than siloxane into methylsiloxane-based inorganic/organic hybrids was found to thermally stabilize the methyl groups of methyl siloxane networks.