Particle size and morphology effects on surface reactivity of alumina

• Main Authors: Chung-lun Kuo, 郭忠倫
• Other Authors: Chi Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/38514004920137469917

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 96 === In this research, we used several kinds of Al2O3 particles with different particle sizes or crystalline morphology to react with methacryloxypropyltrimethoxysilane (MPS). In an tempt to understand the reactivity of Al2O3 particles with MPS. FT-IR results showed that neither acid nor base treatment did not produce OH group on the surface of micrometer-sized alpha-Al2O3 particles. The nanometer-sized alpha-Al2O3 particles had a slightly better reactivity with MPS due to the possession of a larger surface area. The gamma-Al2O3 particles had much more OH groups on surface than alpha-Al2O3 (or theta-Al2O3), and thus resulted in a better reactivity with MPS. Solid-state NMR results showed the presence of Si-O-Al bonds between MPS and the gamma-Al2O3 particles after reaction. TGA results showed that the amount of grafted MPS did not increase when the weight ratio of MPS to gamma-Al2O3 in reaction system is over 0.86. The maximum amount of grafted MPS is about 0.12 g MPS/g gamma-Al2O3. MPS was apparently degraded after being held at 230oC for 5 min.