| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 97 === Abstract
Part I
Based on phosphinate-substituted bisphenol-A (1), a diglycidyl ether derivative (2) was prepared and cured by commercially-available curing agents. The structures of (2) were confirmed by IR, high-resolution mass, 1-D and 2-D NMR spectra. Properties such as glass transition temperature, coefficient of thermal expansion, thermal decomposition temperature, and flame retardancy of the resulting epoxy thermosets were evaluated and compared with those of diglycidyl ether of bisphenol A thermosets. The resulting epoxy thermosets shows high Tg, low thermal expansion, good thermostability and excellent flame retardancy. The polar P=O bond and bulky biphenylene phosphinate pendant make polymer chains difficult to rotate, explaining the high Tg and low thermal expansion characteristic.
Part II
In this part, based on published phosphorous monofunctional benzoxazine monomer (3) and (4) with phenolic group and benzoic acid group respectively, self-curable oxirane compound (5) and (6) was prepared. The structures of (5-6) were confirmed by IR and NMR spectra. Observed by dynamic DSC thermogram, (5-6) own wider processing windows than (3-4), result from hydrogen bonding effect of phenolic and benzoic acid group was diminished by introduce oxirane group. IR analysis was utilized to monitor ring-opening behavior and cured with oxirane group, the reaction path and structure of P (5-6) was proposed. According to proposed reaction path of P (5-6), explaining two exotherm peaks was observed, first peak was result from benzoxazine ring-opening reaction, after that phenoic group produced by ring-opening cured with oxirane group result in second peak. (5) or (6)/DGEBA/DDM series thermosets was prepared. Properties such as glass transition temperature was maintained and better size stability. Flame retardancy of the resulting thermosets was enhanced with the content of (5) or (6) raise up.
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