Abstract
Achieving low friction and wear of poly(phenylene sulfide) (PPS) without using fillers or blending is a challenging task, but one of considerable practical importance. Here we describe how neat PPS with high tribological performance is achieved by manipulating processing parameters (pressure, flow and temperature). The key to achieving high tribological performance is comparatively high molecular chain orientation, realized in neat PPS, at high shear rates and low pressure. The friction coefficient and wear rate are as low as ∼0.3 and ∼10−6 mm3·N−1·m−1, respectively, which break the record for neat PPS. These values are even better than those for PPS-based blends and comparable to PPS composites. Further studies show, for the first time, that wear rate decreases exponentially with increasing molecular chain orientation, prompting us to revise the classical Archard’s law by including the effect of molecular chain orientation. These findings open the possibility of using neat PPS in highly demanding tribological applications.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 21676217, 52003215, 21978240 and 52003219), Youth Project of Basic Research Program of Natural Science in Shaanxi Province (No. 2020JQ179) the Fundamental Research Funds for the Central Universities (Nos. 3102018AX004 and 3102017jc01001), and the Open Testing Foundation of the Analytical & Testing Center of Northwestern Polytechnical University (No. 2020T020). The authors thank Shanghai Synchrotron Radiation Facility (SSRF) for supporting the X-ray measurements.
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Zhang, LQ., Yang, SG., Zhang, JH. et al. Insight into the Excellent Tribological Performance of Highly Oriented Poly(phenylene sulfide). Chin J Polym Sci 40, 290–298 (2022). https://doi.org/10.1007/s10118-022-2672-x
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DOI: https://doi.org/10.1007/s10118-022-2672-x