| Summary: | 碩士 === 東海大學 === 化學工程學系 === 96 === The UV-A ultraviolet was applied to cure polyester acrylate resins which are composed of different component and different composition, respectively. The samples were completely cured at a fixed UV-exposure time of 20 minutes by adding nitrogen during UV irradiating.
Firstly, the percentages between oligomer and monomer changed and the content of photoinitiator was fixed at 2 wt%. The initial decomposition temperature of the acrylate resins with two-function-group or three-function-group monomer will increase with increasing monomer percentage. The thermal expansion coefficient of acrylate resins with two-function-group or three-function-group monomer will decrease with increasing monomer percentage. Nevertheless, these variation trends are contrary to those of the samples with single-function-group monomer. Besides, there is no obvious influence on glass transition temperature of the acrylate resins no matter which monomer is used. The samples with three-function-group monomer have the highest initial decomposition temperature, the lowest thermal expansion coefficient, and a higher glass transition temperature.
Secondarily, the percentages of oligomer and monomer were fixed and the content of photoinitiator was increased. No matter which monomer is used, the initial decomposition temperature and glass transition temperature of the acrylate resins will decrease, but the thermal expansion coefficient of the samples will increase.
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