Thermomechanical Performance of Thermoplastic Polyurethane–Poly(tetrafluoroethylene) Fibril Nanocomposites AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c00738

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Poly(tetrafluoroethylene) (PTFE) has recently received considerable attention as a promising filler because of its low friction coefficient, good thermal stability, as well as excellent chemical resistance and high melting point. In this study, TPU-PTFE nanocomposites with improved thermomechanical properties were successfully made by fibrillation of micron-sized PTFE particulates inside the thermoplastic polyurethane (TPU) matrix using melt extrusion. PTFE forms a fibrillary network inside the TPU matrix, with more fibrils present at higher filler loading. The presence of PTFE network restricts the mobility of TPU chains, enhancing the creep behavior (e.g., up to 63% reduction in creep strain) and increasing the thermal stability of the nanocomposite, while the color and appearance remain unchanged. Moreover, incorporating PTFE in the TPU matrix increases the storage modulus and reduces the thermal expansion coefficient (up to 62% at a temperature of 130–160 °C) of the nanocomposites by comparison with the neat TPU. The glass transition temperature of nanocomposites with 10 wt % PTFE shows two transitions, one at 6 °C and the other at 39 °C, while a single peak is observed at −12 °C for the neat TPU.