Abstract

The results of comparative studies of hydrothermal aging of epoxy organic plastics based on the Rusar and Armos high-strength and -modulus aramid fibers are presented. Kinetic laws of moisture transport into the composites were established, the corresponding parameters were determined, and the kinetics of changes in the shear strength of organic plastics under forced exposure to heat and moisture was determined. It was shown that the diffusion of water vapors into the composite materials can be described with a good approximation by Fick’s law. Moreover, we obtained a closer approximation to Fick’s law for Rusar organic plastic (with the deviations being smaller) compared to the Armos organic plastic. A kinetic model of a decrease in the interlayer shear strength of the composites upon exposure to heat and moisture is suggested. Differences in the parameters of water sorption kinetics and the interlayer shear strength of organic plastics are attributed to the different surface polarity and morphology of initial fibers and, respectively, to the differences in the arrangement of interfacial layers in the composites.

中文翻译：

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界面效应在芳纶复合材料水热老化中的作用

摘要

提出了基于Rusar和Armos高强度和模量芳族聚酰胺纤维的环氧有机塑料水热老化的比较研究结果。建立了湿气运入复合材料的动力学规律，确定了相应的参数，并确定了有机塑料在强制受热和受潮的条件下剪切强度变化的动力学。结果表明，水蒸气在复合材料中的扩散可以用菲克定律很好地描述。此外，与Armos有机塑料相比，我们对Rusar有机塑料获得了更接近Fick定律的近似值（偏差较小）。提出了在暴露于热和湿气时复合材料的层间剪切强度降低的动力学模型。