Abstract
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.
Highlights
Accepted: 18 January 2021Overcoming new technological challenges and greater social awareness of environmental protection are the ideal basis for investigating new materials that improve the properties of existing ones, but by putting natural resources to better use
After injection samples were trimmedwere trimmed in order to be adapted to the dynamic mechanical analysis (DMA)
Glass transition showed a difference that was increased with glass fiber content, with a maximum difference temperature was linear with glass fiber content and the logarithm of the frequency, acof 19.5% for the samples reinforced with the 50% glass fiber weight
Summary
Overcoming new technological challenges and greater social awareness of environmental protection are the ideal basis for investigating new materials that improve the properties of existing ones, but by putting natural resources to better use. Schaaf et al [37] developed a method to estimate the life cycle of short, glass fiber-reinforced polymers, whereas Mbyniec and Uhl [38] proposed a failure criterion that depended on both aging time and fibers’ alignment The aim of these proposals was to analyze the durability and resistance of materials. PBT is an ideal candidate in the growing number of electronic and electrical components in the transport sector, such as batteries and components for chargers, due to its excellent properties as an electric insulator These components could be submitted to high-temperature environments during long periods of time, and stiffness and energy absorption are key factors due to dimensional stability and durability requirements. Temperatures that came close to the material’s glass transition temperature were considered
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