本文在日本奥田聪提出的电阻法测定高聚物扩散系数公式的基础上,对几种介质在环氧树脂(E-44树脂)薄膜和双酚 A 不饱和聚酯树脂(323树脂)薄膜中的扩散行为进行了一系列的实验测定和计算,阐明了扩散系数随介质温度、浓度和浸泡时间变化的关系,讨论了介质在高聚物中的物理和化学作用对扩散行为的影响。实验表明:用电阻法测定扩散系数不但对研究高聚物在化学介质中的腐蚀机理具有一定的意义,而且该法具有快速、方便的特点,可望用于实际耐蚀设备的监控。
It is shown that the penetration of chemicals into polymers can be eva- luated by the change of electrical resistance of exposed polymers.Results of bisphenol A unsaturated polyester(323 resin)in 10% sodium chloride and epoxy resin(E-44 resin)in 25% sulfuric acid as a function of temperature are in accord with Arrihenius equation.The time-dependence of diffusivity of sulfuric acid into E-44 resin can be described empirically by the formula: D=Ae~(at).The effect of concentration of sulfuric acid is rather complex:at lower concentrations,the diffusivity of acid into E-44 resin decreases with increasing concentration,which is governed mainly by physical diffusion, while at concentrations higher than 30%,an increase in diffusivity is obser- ved,which is attributed to chemical reactions.It seems that the technique described can be employed to monitor practical performance of plant equip- ments on account of its high accuracy and ease of operation.
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