摘要
利用熔融共混法制备了热塑性聚氨酯/氧化铈(TPU/CeO_(2))抛光复合材料,通过小角散射分析(SAXS)、差示扫描量热分析(DSC)、扫描电镜(SEM)和摩擦测定仪等方法研究了CeO_(2)的加入对复合材料的微相分离结构、热性能及摩擦性能的影响。结果表明:偶联剂可有效地改善CeO_(2)粒子在聚合物基体中的分散性。在聚氨酯(PU)体系中引入少量改性后的CeO_(2)粒子,可以使PU硬段的排列有序性增加,增大硬段微区的平均距离,从而促进材料微相分离程度的增加。这种微相结构的变化,可以提升材料的耐热性和热分解温度,当CeO_(2)粒子含量达到1.0%时,可以使材料的摩擦系数降低至0.10以下,材料去除率达到13.97 nm/min。但是过高含量的CeO_(2)则会由于分散性不好团聚等问题对微相分离程度及摩擦效果产生不利影响。
The thermoplastic polyurethane/cerium oxide(TPU/CeO_(2))polishing composites were prepared by the means of melt blending.The effects of CeO_(2) on the microphase separation,morphology,thermal properties and friction properties of the composites were studied by small-angle scattering analysis(SAXS),differential scanning calorimetry(DSC),scanning electron microscopy(SEM)and friction tester.The results show that the coupling agent can effectively improve the dispersion of CeO_(2) particles in polymer matrix.When a small amount of modified CeO_(2) particles are added into the polyurethane matrix,the arrangement order of the polyurethane hard segments can be increased,and the average distance between the hard segments is also increased,which leads to the increase of the degree of microphase separation.The thermal analysis results show that the change of the microphase structure can improve the heat resistance and thermal decomposition temperature of the composites.In addition,when the content of CeO_(2) particles reaches 1.0%,the friction coefficient of the polished composites with such a microphase structure can be reduced to below 0.10,while the material removal rate reaches 13.97 nm/min.However,too high content of CeO_(2) will adversely affect the degree of microphase separation and the friction effect due to the problems of poor dispersibility and agglomeration.
作者
马驰
刘紫婷
史颖
刘立志
宋立新
王连慧
史胜男
MA Chi;LIU Zi-ting;SHI Ying;LIU Li-zhi;SONG Li-xin;WANG Lian-hui;SHI Sheng-nan(Advanced Manufacturing Institute of Polymer Industry,Shenyang University of Chemical Technology,Shenyang 110142,China;Shenyang Institute of Industrial Technology Co.,Ltd.,for Advanced Coating Materials,Shenyang 110142,China;School of Material Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《塑料科技》
CAS
北大核心
2021年第7期1-7,共7页
Plastics Science and Technology
基金
辽宁省攀登学者支持项目
辽宁省兴辽英才计划青年拔尖人才项目(XLYC1807007)
2019年度辽宁省高等学校创新人才支持计划项目(LR2019054)
沈阳市中青年科技创新人才项目(RC200415)
辽宁省教育厅项目(LQ2020007)。
关键词
抛光材料
热塑性聚氨酯
氧化铈
微相分离
摩擦性能
Polishing material
Thermoplastic polyurethane
Cerium oxide
Microphase separation
Friction properties
