Dielectric Strength and Aging Performance of Polybutylene Terephthalate (PBT) Under the Influence of Temperature and Humidity

Wels, Sebastian; Boettge, Bianca; Bernhardt, Rico; Klengel, Sandy; Claudi, Albert

doi:10.1007/978-3-030-31680-8_48

Cited by 2 publications

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References 3 publications

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“…PBT reinforced with 30% short glass fiber, PBT-GF30, is widely used in the housing for electronic components due to its good properties and suitability for manufacture through injection molding. Its fast crystallization rate enhances moldability and, consequently, leads to parts with good surface quality [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

et al. 2021

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Short fiber reinforced polymers are widely used in the construction of electronic housings, where they are often exposed to harsh environmental conditions. The main purpose of this work is the in-depth study and characterization of the water uptake behavior of PBT-GF30 (polybutylene terephthalate with 30% of short glass fiber)as well as its consequent effect on the mechanical properties of the material. Further analysis was conducted to determine at which temperature range PBT-GF30 starts experiencing chemical changes. The influence of testing procedures and conditions on the evaluation of these effects was analyzed, also drawing comparisons with previous studies. The water absorption behavior was studied through gravimetric tests at 35, 70, and 130 ∘C. Fiber-free PBT was also studied at 35 ∘C for comparison purposes. The effect of water and temperature on the mechanical properties was analyzed through bulk tensile tests. The material was tested for the three temperatures in the as-supplied state (without drying or aging). Afterwards, PBT-GF30 was tested at room temperature following water immersion at the three temperatures. Chemical changes in the material were also analyzed through Fourier-transform infrared spectroscopy (FTIR). It was concluded that the water diffusion behavior is Fickian and that PBT absorbs more water than PBT-GF30 but at a slightly higher rate. However, temperature was found to have a more significant influence on the rate of water diffusion of PBT-GF30 than fiber content did. Temperature has a significant influence on the mechanical properties of the material. Humidity contributes to a slight drop in stiffness and strength, not showing a clear dependence on water uptake. This decrease in mechanical properties occurs due to the relaxation of the polymeric chain promoted by water ingress. Between 80 and 85 ∘C, after water immersion, the FTIR profile of the material changes, which suggests chemical changes in the PBT. The water absorption was simulated through heat transfer analogy with good results. From the developed numerical simulation, the minimum plate size to maintain the water ingress unidirectional was 30 mm, which was validated experimentally.

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Section: Introductionmentioning

confidence: 99%

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

et al. 2021

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Improvement of the test sample arrangements according to IEC 60243: Electrical strength of insulating materials: test methods

Wels,

Fehmer,

Raulf

et al. 2024

Electr Eng

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This publication deals with the dielectric breakdown performance of plastics and the problems which occur if the corresponding standard IEC 60243-1 is applied. In the first step, the test materials and the methods were described, followed by the problems, which occur with the specimen according to the standard. In a final step, a solution (specimen) for the problem is developed and evaluated with an exemplary investigation.

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Dielectric Strength and Aging Performance of Polybutylene Terephthalate (PBT) Under the Influence of Temperature and Humidity

Cited by 2 publications

References 3 publications

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

Improvement of the test sample arrangements according to IEC 60243: Electrical strength of insulating materials: test methods

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