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Effects of temperature, humidity and automotive fluids exposure on glass fiber/polyurethane composites

机译：玻璃纤维/聚氨酯复合材料温度，湿度和汽车流体暴露的影响

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摘要

In this study the effects of operational environments (temperature, humidity, and automotive fluids) on the long-term durability of two types of glass fiber reinforced polyurethane are investigated. Variation of mass, flexural strength, and viscoelastic response are evaluated in order to observe the changes in the material. In most cases, samples reach a saturation plateau, following the Fick's law of diffusion. In gasoline and brake fluid a pseudo-saturation plateau, followed by further weight gain, is achieved. Samples in water at 70 degrees C do not saturate even after 13 months of exposure. It is assumed that water molecules attach to the surface of the glass fibers, diffusing along the fibers. Three point bending (3PB) tests and dynamic mechanical analysis (DMA) of the virgin and saturated specimens show insignificant changes in the bending strength and glass transition temperature (Tg) for the samples in automotive fluids at room temperature. The same properties decrease linearly with increased humidity and temperature. After drying the samples, DMA scans show reversibility in the Tg and storage modulus; therefore no chemical reaction occurs in the presence of moisture/temperature. The brake fluid causes a secondary peak around 30 degrees C-40 degrees C, which could be due to the formation of a new phase or of a 'skin-core' structure. POLYM. COMPOS., 40:2357-2367, 2019. (c) 2018 The Authors. Polymer Composites published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers.
机译：在这研究中，研究了操作环境（温度，湿度和汽车流体）对两种玻璃纤维增​​强聚氨酯的长期耐久性的影响。对质量，弯曲强度和粘弹性响应的变化进行评估，以观察材料的变化。在大多数情况下，样本在Fick的扩散定律之后达到饱和度高原。在汽油和制动液中，实现了伪饱和度高，然后进一步重量增益。即使在13个月的暴露后，70摄氏度的水中的样品也不会饱和。假设水分子连接到玻璃纤维的表面，沿着纤维扩散。在室温下，处女和饱和样品的三点弯曲（3PB）测试和动态机械分析（DMA）显示出弯曲强度和玻璃化转变温度（TG）在室温下的样品的微不足道的变化。相同的性能随着湿度和温度的增加而导致线性降低。干燥样品后，DMA扫描显示TG和储存模量的可逆性;因此，在水分/温度存在下不会发生化学反应。制动液导致次级峰值约为30摄氏度C-40℃，这可能是由于形成新相或“皮肤芯”结构。聚合物。 Compos。，40：2357-2367,2019。（c）2018年作者。由Wiley Hearyichs，Inc。发表的聚合物复合材料代表塑料工程师协会。

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