The Relationship between Foam Structure and Performance of Epoxy/Polysilazane Systems

• Main Authors: Tzu-Ning Su, 蘇子寧
• Other Authors: Chih-Wei Chiu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/v72tvb

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 107 === The purpose of this study was to investigate the cross-linking reaction and the foaming reaction between Bisphenol A epoxy resin, amine hardener and polysilazane. Research found out the correlation between the processing conditions and the physical properties of epoxy foam. The ratio of epoxy resin to amine hardener is 2:1.5. The first part investigated the correlation by adding different amount of polysilazane. According to DSC and FTIR, determined the cross linking reaction rate and processing temperature; GC-mass determined the gas species; HIDEN verified the gas processing rate. We used Rheometer to simulate foaming process, used OM to observe foaming pore type. We test compression set, hardness, weather resistance for physical properties. The experimental results show that more polysilazane we add, higher foamability we got, but lower physical property we had. We changed foaming process in the second part, decided to obtain the maximum foamability with the minimum amount of polysilazane. It was not influence on the foamability by lower the cross-linking rate. Because the viscosity of epoxy was alike in different temperature, gas production was fixed, so there was no significant difference in foaming effect. When the stirring time was changed in the same amount of polysilazane. Longer time we stirred, higher foamability we got. It was because when the stirring time increased, the collision ratio between epoxy and polysilazane was increased, and also increased the gas production. So the stirring time is proportional to the foaming efficiency.