Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

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.

Feasibility Analysis of Bolted Joints with Composite Fibre-Reinforced Thermoplastics

“…However, CFRTP-metals joints are reliant on the polymers' durability, whose mechanical properties are prone to environmental degradation and worsen with time and temperature, as it was described by Gómez et al [33]. This study demonstrated that the addition of glass fibres makes it possible to reduce the loss of stiffness over time and increase the energy dissipated in each deformation.…”

“…To implement thermoplastic polymers, it is necessary to understand the material behaviour throughout its life cycle. This study presents a fatigue analysis of the CFRTP/Steel-threaded joint from a vehicle chassis application based on the results obtained in previous studies from the authors in anti-vibration and damping [8], CFRTP-rubber adhesive [14], viscoplasticity and high-temperature stiffness [33], and characterization of a composite material reinforced with vulcanized rubber [32].…”

Accounting for viscoelastic effects in a multiscale fatigue model for the degradation of the dynamic stiffness of short-fiber reinforced thermoplastics

“…At the same time, it is well-accepted in material science that polymers are viscoelastic in nature [70]. Thus, the observed dynamic stiffness of polymer-based materials depends on the loading frequency [13,71].…”

Influence of Reinforcing Efficiency of Clay on the Mechanical Properties of Poly(butylene terephthalate) Nanocomposite

“…Predominantly, PBT is used in the automotive industry for applications such as connectors and sensors. The combination of rigidity and solvent resistance of PBT has made it a major contributor to the personal computer connector industry [23][24][25][26][27][28][29][30].…”

“…Although PBT has good mechanical properties and thermal stability, these are still insufficient for its potential applications in a wide range of industrial fields. Thus, the incorporation of different fillers in micro and nano-size into PBT has been evaluated in order to develop high-performance PBT composite materials applicable for advanced industries [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Additionally, the incorporation of only a small amount of clay, into PBT can increase the low impact strength and heat distortion temperature, and reduce the brittleness and cost, widening the field of applicability of this polyester [24,25,30].…”