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首页> 外文期刊>Journal of Applied Polymer Science >The effects of temperatures and volumetric expansion on the diffusion of fluids through solid polymers
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The effects of temperatures and volumetric expansion on the diffusion of fluids through solid polymers

机译：温度和体积膨胀对固体聚合物液体扩散的影响

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摘要

This study examines moisture sorption behaviors of two glassy polymers, epoxy and vinylester, immersed in different fluids at two temperatures below the glass transition temperatures of the polymers. The main purpose of this study is to understand the effect of volume-dependent temperatures and deformations on the diffusion process of solid polymers. Diffusivity coefficients are first determined by assuming the diffusion to follow the classical Fickian diffusion. In some cases, moisture sorption led to quite significant changes of volume, and the diffusion process cannot be well described by the Fickian diffusion. In such situation, the coupled deformation-diffusion model for linear elastic isotropic materials presented by Gurtin(1) is adopted, as a first approximation. This coupled deformation-diffusion model reduces to a Fickian diffusion model when the coupling parameters are absent and the volume changes in the solid polymers during diffusion are negligible. A finite difference method is used in order to solve for the coupled deformation-diffusion model. The model is used to predict the one-dimensional moisture diffusion in thin plates and the multiaxial three-dimensional moisture diffusion in dogbone specimens. The multiaxial diffusion in the dogbone specimens is used to validate the calibrated material parameters from the standard thin plate diffusion characterization. (C) 2017 Wiley Periodicals, Inc.
机译：本研究检查了两个玻璃状聚合物，环氧和乙烯基酯的水分吸附行为，在低于聚合物的玻璃化转变温度的两个温度下浸入不同的流体中。本研究的主要目的是了解体积依赖性温度和变形对固体聚合物的扩散过程的影响。首先通过假设扩散来遵循经典的Fickian扩散来确定扩散系数。在某些情况下，水分吸附导致体积的相当显着变化，并且由于Fickian扩散不能很好地描述扩散过程。在这种情况下，采用由Gurtin（1）呈现的线性弹性各向同性材料的耦合变形 - 扩散模型作为第一近似。当不存在偶联参数并且扩散过程中固体聚合物中的体积变化可以忽略时，该耦合变形漫射模型减小到Fickian扩散模型。使用有限差分方法以解决耦合的变形扩散模型。该模型用于预测薄板中的一维水分扩散和狗骨标本中的多轴三维水分扩散。使用标准薄板扩散表征的狗耳标本中的多轴扩散用于验证校准的材料参数。 （c）2017 Wiley期刊，Inc。

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