Experimental investigation of moisture diffusion in short-glass-fiber-reinforced polyamide 6,6

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[1] Zhang, Shi
[2] Huang, Zhigao
[3] Zhang, Yun
[4] Zhou, Huamin
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Zhou, Huamin (hmzhou@hust.edu.cn) | 1600年 / John Wiley and Sons Inc卷 / 132期
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Moisture diffusion in polyamide 6,6 (PA66) and its short glass fiber-reinforced composites has a great influence on their mechanical properties and service lives under hydrothermal environments. Hence, the moisture diffusion in neat PA66 and its composites was studied comprehensively in this study with the general Fickian model. To systematically investigate the effects of the fiber content, humidity, temperature, and humidity-temperature coupling effect on the diffusion coefficient and equilibrium concentration, gravimetric experiments for the PA66 composites were carried out under different hydrothermal conditions. The results show that the equilibrium moisture concentration depended on the relative humidity and fiber content but only depended weakly on temperature. The diffusion velocity was affected by the three aforementioned factors with different trends. The analysis of variance demonstrated that the humidity-temperature coupling effect played an important role in the diffusion process. The regression analysis gave the corresponding quadratic regression equations. © 2015 Wiley Periodicals, Inc;
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