Gómez Carmelo, Mira Jorge, Carrión-Vilches Francisco J, Cavas Francisco
Doctorate Program in Industrial Technologies, International School of Doctorate, Technical University of Cartagena, 30202 Cartagena, Spain.
Materials Science and Metallurgical Engineering Group, Materials Engineering and Manufacturing Department, Technical University of Cartagena, 30202 Cartagena, Spain.
Materials (Basel). 2021 Jan 20;14(3):483. doi: 10.3390/ma14030483.
The aim of this work was to show the evolution over time of the dynamic moduli in components made of Polybutylene Terephthalate reinforced with glass fiber when they are held to temperatures close to the glass transition temperature over time. For this purpose, PBT samples reinforced with short, glass fibers of Ultradur material with 0%, 20%, and 50% in weight content were tested. Dynamic moduli showed an increment with glass fiber content showing a nonlinear behavior with the temperature. The evolution of storage modulus was depicted by means of a modified law of mixtures with an effectiveness factor depending on temperature and fiber content, whereas the evolution over time was obtained with a time-temperature transformation generated with the TTS Data Analysis software of TA-instruments for a given temperature. Storage modulus showed a linear relationship with glass fiber content when components were held to temperatures near to their respective glass transition temperature, obtained from the maximum of loss modulus curve with temperature. In summary, the value and evolution of dynamic moduli of PBT samples improved with glass fiber content, allowing us to increase the durability of components when they are submitted to high-temperature environments.
这项工作的目的是展示由玻璃纤维增强的聚对苯二甲酸丁二醇酯制成的部件在长时间保持接近玻璃化转变温度的温度时，其动态模量随时间的变化情况。为此，测试了重量含量分别为0%、20%和50%的由Ultradur材料的短玻璃纤维增强的聚对苯二甲酸丁二醇酯（PBT）样品。动态模量随玻璃纤维含量增加，且随温度呈现非线性行为。储能模量的变化通过一种修正后的混合法则来描述，该法则具有一个取决于温度和纤维含量的有效因子，而随时间的变化是通过TA仪器的TTS数据分析软件针对给定温度生成的时间-温度转变来获得的。当部件保持在接近各自玻璃化转变温度（从损耗模量随温度变化曲线的最大值获得）的温度时，储能模量与玻璃纤维含量呈现线性关系。总之，PBT样品的动态模量的值和变化情况随玻璃纤维含量而改善，这使我们能够在部件处于高温环境时提高其耐久性。
