淡江大學機構典藏:Item 987654321/60141
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    题名: Fourier transform infrared analysis of polycarbonate/epoxy mixtures cured with an aromatic amine
    作者: 董崇民;Don, Trong-ming
    贡献者: 淡江大學化學工程與材料工程學系
    日期: 1998-09
    上传时间: 2011-10-13 13:05:07 (UTC+8)
    摘要: In our previous article, we established that polycarbonate (PC) can react with the diglycidyl ether of bisphenol-A (DGEBA) at 200°C through transesterification and addition reactions, resulting in degraded PC chains with phenolic end groups and also in PC/DGEBA copolymers. However, these reactions can be minimized or eliminated at lower temperatures, below 160°C. In this article, Fourier transform infrared analysis (FTIR) was used to study the curing kinetics of epoxies in the presence of PC. The curing agent was an aromatic amine, diaminodiphenyl methane (DDM). FTIR results showed that the presence of a small amount of PC promoted the amine–epoxide reactions, probably due to the catalytic effect of the phenolic end groups in the PC chains. However, the PC did not alter the epoxy cure reaction mechanism. Two different blending processes were used to premix the PC and DGEBA, namely, solution-blending and melt-blending processes, in order to give different extents of prereactions. If a solution-blending process was used, PC tended to undergo crystallization during an early stage of cure. When a melt-blending process was used, no melting peak was observed in the thermograms of the differential scanning calorimeter (DSC) for the modified epoxies; PC chains bonded to DGEBA during prereaction at 200°C, thus inhibiting the crystallization of PC during cure.
    關聯: Journal of applied polymer science 69(12), pp.2395-2407
    DOI: 10.1002/(SICI)1097-4628(19980919)69:12<2395::AID-APP11>3.0.CO;2-X
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文

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