Authors Puentes-Parodi, A. ; Santoro, L. A. ; Gehde, M. ; Leuteritz, A. ; Kühnert, I.
Title Influence of hygro-thermal loads on the durability of thermoplastic-polyurethane-steel-hybrids
Date 23.01.2019
Number 56318
Abstract The growing demand of polymer-metal hybrids as structural components in the automotive, aerospace, medical and military applications may require long-term stability under thermal stress. A full understanding of the long-term performance of bonded structures subjected to high temperature and humidity is required to use these products in engineering and industrial applications. In real applications, temperature will be higher at the proximity to the steel substrate, therefore, the boundary between steel and polymer suffers the highest hygrothermal stress and, therefore, a collapse of the structure starting at this boundary is most likely. In this work, kinetic parameters of hygrothermal decomposition of a thermoplastic polyurethane, TPU, were evaluated through the Ozawa-Flynn-Wall, Friedman and Chang methods after being subjected to atmospheres of 85 °C/40 % RH, and 40 °C/90 % RH for a period time of 1000 hours. Thermogravimetric tests were conducted at three different heating rates, 5, 10 and 15 K/min and different kinetic parameters were obtained, such as the activation energy, reaction order and the pre-exponential factor. These parameters were useful to predict the lifetime of the polymer that was in direct contact with the metal substrate, assuming a continuous operation work at certain temperatures.
Publisher AIP Conference Proceedings
Citation AIP Conference Proceedings 2055 (2019) 070027

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