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Kevlar® (poly p-phenylene terephthalamide, PPTA) and PBI (poly benzimidazole) are two high-performance fibers with excellent thermal stability, a feature that makes them suitable for applications in aerospace, automotive and firefighting protective clothing. In a previous study, it was found that the tensile breaking force of yarns pulled from Kevlar/PBI fabric decreased to 50% of its original value...
The mechanical properties of polymer encapsulating materials change considerably when packages are exposed to elevated temperatures for longer times. Here we report a systematic study on the change in viscoelastic properties of a commercial molding compound which is stored at 175°C for periods of time ranging up to 4 weeks. It is shown that instead of the expected degradation, the modulus and the...
An electronic device cannot perform its designed functions until it is packaged such that it is interconnected with the rest of the system and protected. As an encapsulation material, thermosetting polymers are widely used. It is well known that properties of polymer-based composites like molding compounds are highly affected by the influence of temperature, relative humidity and degree of conversion...
Rubber material properties, and useful lifetime prediction and evaluation are very important in the design procedure to assure the safety and reliability of rubber components. We have been interested for many years in predicting the lifetimes of rubber materials in oxygen-containing environments using a combination of accelerated aging tests and extrapolation models. In this paper, we investigate...
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