Thermal, Spectroscopic, and Morphological Analysis of Sol-gel-derived PMMA/Silica Hybrid Composites

• Main Authors: Jun-Guang Chen, 陳俊光
• Other Authors: Tzu-Chien Hsu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/65173905545490763284

碩士 === 國立中山大學 === 材料科學研究所 === 91 === A series of PMMA/silica hybrid composites were prepared by a sol-gel process in different catalytic and drying. Their thermal properties were analysized by DSC and TGA, the micro-structures by SEM, and the chemical reactions by FTIR. The highest decomposed temperature of these hybrid composites were found for samples prepared at low pH due to the hydrogen bonding. DSC data indicated the samples cured at 25 and 140 oC existed a higher Tg due to unhydrolyzed TEOS. The heat-treated hybrid composites exhibited more compact structures. The size of SiO2 particles from SEM increases with increasing drying temperature and pH value. The hybrid composites prepared in acid condition showed more Si-O-Si bonding than Si-O-C bonding in FTIR. In addition, in FTIR spectra the shifts have been observed from a non-hydrogen-bonded C=O at 1733cm-1 to a hydrogen-bonded carbonyl at 1725cm-1.