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首页> 外文期刊>Journal of Applied Polymer Science >EVOLUTION OF ION MOBILITY IN CURED EPOXY-AMINE SYSTEM AS DETERMINED BY TIME-OF-FLIGHT METHOD
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EVOLUTION OF ION MOBILITY IN CURED EPOXY-AMINE SYSTEM AS DETERMINED BY TIME-OF-FLIGHT METHOD

机译：用飞行时间法测定凝缩的环氧-胺系统中离子迁移率的变化

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The concept of the time-of-flight (TOF) method for the determination of ionic carriers' mobility is presented. This method is used for the model system, the properties of which (including viscosity) change with time: the isothermally cured epoxy-amine system. It is demonstrated that the form of the TOF current signals depend on the material of the electrodes. The Cu, Ag, Al, and Au electrodes were tested; of these, the Cu and Au electrodes have yielded the most distinct TOF signals and therefore were chosen for further experiments. The investigated samples were placed between parallel electrodes with guard rings distanced with polyethylene terephthalate (PET) films of different thickness (0.02-0.2 mm). According to the predictions, it was found that the TOF of the ionic carriers increases with an increase of the distance between the electrodes (for constant electric field) and decreases with an increase of the electric field (for constant distance). The series of measurements performed for the well-known epoxy resin system diglycidylether of bisphenol A with diamino-4,4'-dimethyl-3,3'-dimethyldicyclohexylmethane, isothermally cured at different temperatures, have confirmed that in a course of the curing, below the gelation, the conductivity decreases following the decrease of the ionic mobility due to the viscosity increase during the reaction. However, with an advancement of reaction, deviations from that linear relationship are observed. (C) 1997 John Wiley & Sons, Inc. [References: 21]
机译：提出了确定离子载体迁移率的飞行时间（TOF）方法的概念。此方法用于模型系统，其特性（包括粘度）随时间变化：等温固化的环氧胺系统。已经证明，TOF电流信号的形式取决于电极的材料。测试了铜，银，铝和金电极;其中，铜和金电极产生了最明显的TOF信号，因此被选择用于进一步的实验。将研究的样品放置在带有保护环的平行电极之间，保护环与不同厚度（0.02-0.2 mm）的聚对苯二甲酸乙二醇酯（PET）膜隔开。根据预测，发现离子载流子的TOF随着电极之间的距离的增加而增加（对于恒定电场），并且随着电场之间的增加（对于恒定距离）而减小。对双酚A与二氨基4,4'-二甲基-3,3'-二甲基二环己基甲烷在不同温度下等温固化的众所周知的双酚A环氧树脂体系二缩水甘油醚进行的一系列测量已证实，在固化过程中，低于凝胶化时，由于反应过程中的粘度增加，电导率随离子迁移率的降低而降低。但是，随着反应的进行，观察到与该线性关系的偏差。 （C）1997 John Wiley＆Sons，Inc. [参考：21]

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