The cure and diffusion of water in halogen containing epoxy/amine thermosets
The cure and diffusion of water in halogen containing epoxy/amine thermosets
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DOI：
10.1016/s0032-3861(96)00614-3
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发表时间：
1997-03-01
期刊：
影响因子：
4.6
通讯作者：
Pollock, EA
中科院分区：
文献类型：
--
作者：
Hayward, D;Hollins, E;Pollock, EA
用介电测量法测定了氯、甲基和三氟甲基取代基对4,4′-二氨基二苯砜和4,4′-双[1,4-苯基双（1-甲基乙基）]-双[2,6-二甲基]苯胺固化双[N，N-双（2,3-环氧丙基）-4-氨基苯基]甲烷的影响，并对数据进行了分析，给出了凝胶化和玻璃化的观点。在固化过程中还进行了红外测量，以监测环氧基团的消耗。对N，N-二缩水甘油三酯苯胺体系进行了动态机械热分析和密度测量，观察到在树脂结构中加入三氟甲基后玻璃化转变温度降低。对这些树脂的吸水性进行了介电学和重量学研究。与吸水的重力数据一致，在10 Hz下获得的介电数据表明，三氟甲基取代增加了扩散系数，而氯取代降低了扩散系数。氯化树脂表现出高于预期的初始介电增量，这是由于树脂的微孔表面结构的影响。树脂表面的原子力显微镜显示，氯化和氟化树脂比质子化类似物具有更大的表面粗糙度，这与介电观察结果一致。分析树脂体系中“结合”和“自由”水的数量表明，卤化树脂具有较低的结合水百分比，而更多的水处于“自由”状态。1997爱思唯尔科学有限公司
Dielectric measurements were performed to determine the effect of chlorine, methyl and trifluoromethyl substituents on the cure of bis[N,N-bis(2,3-epoxypropyl)-4-aminophenyl]methane with 4,4'-diaminodiphenylsulfone and 4,4'-bis[1,4-phenylenebis(1-methylethylidene)]-bis[2,6-dimethyl]benzamine, and the data were analysed to give gelation and vitrification points. Infra-red measurements were also carried out during the cure process to monitor the consumption of epoxy groups. Dynamic mechanical thermal analysis and density measurements were carried out on the N,N-diglycidylaniline system and a reduction in the glass transition temperature was observed to occur with the incorporation of a trifluoromethyl group into the resin structure. Dielectric and gravimetric studies are reported on the absorption of water by these resins. In agreement with gravimetric data for water absorption, dielectric data obtained at 10 Hz showed that trifluoromethyl substitution increases the diffusion coefficient whereas chlorine substitution decreased it. The chlorinated resin exhibited a higher than expected initial dielectric increment, which has been attributed to the effect of a micro-porous surface structure of the resin. Atomic force microscopy of the resins surfaces indicates that the chlorinated and fluorinated resins have greater surface roughness than the protonated analogues, consistent with the dielectric observations. Analysis of the amount of 'bound' and 'free' water in the resin systems shows that the halogenated resins have a lower percentage of bound water and more of the water is in the 'free' state. (C) 1997 Elsevier Science Ltd.