玻璃纤维改性超高分子量聚乙烯的热膨胀和摩擦学性能
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国家自然科学基金资助项目(52175183);湖北省杰出青年人才项目(2020CFA089);武汉市企业技术创新项目(2020010602012060)


Thermal Expansion and Tribological Properties of Glass Fiber Modified UHMWPE
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    摘要:

    为了降低聚合物摩擦副材料的热膨胀系数,拓展其在宽温域范围内的应用,用未处理和经硅烷偶联剂KH570 改性处理后的玻璃纤维(GF)对超高分子量聚乙烯(UHMWPE)改性,采用热压成型工艺制备GF/UHMWPE复合材料。通过傅里叶变换红外光谱表征了2 种填料的微观结构差异;用差示扫描量热仪(DSC)分析了复合材料的熔点和结晶度;借助热膨胀仪(DIL)测定了复合材料的热膨胀率和热膨胀系数,并在干摩擦环境下,研究了不同含量复合材料的摩擦学性能。结果表明,经过KH570 改性处理后的GF形成了稳定的Si—O—Si 结构,改善了与UHMWPE基体的黏结性;GF由于本身较低的热膨胀系数,并且能与高分子链形成较强的作用力,可以有效改善UHMWPE的热膨胀性能;GF/UHMWPE复合材料的摩擦系数随着填料含量的增加而先下降后上升、磨损量随填料含量的增加而增大,在相同填料添加量时,经过KH570 改性处理的GF复合材料的界面结合力更好,综合性能优于未处理GF复合材料。

    Abstract:

    In order to reduce the thermal expansion coefficient of polymeric friction pair materials and expand their applications in a wide temperature range, GF/UHMWPE composites were prepared by hot pressing with untreated and silane coupling agent KH570- modified glass fibers (GF) modified with ultra- high molecular weight polyethylene (UHMWPE). The microstructural differences between the two fillers were characterized by FT- IR; the melting point and crystallinity of the composites were analyzed by differential scanning calorimeter (DSC); the thermal expansion rate and thermal expansion coefficient of the composites were determined with the help of thermal expansion meter (DIL), and the tribological properties of the composites with different mass fractions were investigated under dry friction environment. The results show that the GF modified with KH570 formed a stable Si—O—Si structure, which improves the bonding with the UHMWPE matrix; GF can effectively improve the thermal expansion performance of UHMWPE due to its low thermal expansion coefficient and its ability to form a strong force with polymer chains; the friction coefficient of GF/UHMWPE composites decreases and then increases with the filler content, and the wear coefficient increases with the increase of filler content. At the same amount of filler, GF composites modified with KH570 have better interfacial adhesion and comprehensive properties than untreated GF/UHMWPE composites.

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曹翔禹, 贾 丹, 詹胜鹏, 杨 田, 李 健, 段海涛.玻璃纤维改性超高分子量聚乙烯的热膨胀和摩擦学性能[J].高分子材料科学与工程,2022,38(7):60-68.

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