TiO_(2)纳米粒子增强超高分子量聚乙烯和高密度聚乙烯复合材料的性能  

Properties of Ultra-high Molecular Weight Polyethylene and High-density Polyethylene Composites Reinforced with TiO_(2)Nanoparticles

作　　者：隋洋 仇张杰 崔毅 李家成 丛川波[1,2] 孟晓宇[1,2] 周琼[1,2] Sui Yang;Qiu Zhangjie;Cui Yi;Li Jiacheng;Cong Chuanbo;Meng Xiaoyu;Zhou Qiong(College of New Energy and Materials,China University of Petroleum-Beijing,Beijing 102249,China;Beijing Key Laboratory of Failure,Corrosion and Protection of Oil/Gas Facilities,China University of Petroleum-Beijing,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)新能源与材料学院,北京102249 [2]中国石油大学(北京)油气装备材料失效与腐蚀防护北京重点实验室,北京102249

出　　处：《工程塑料应用》2023年第2期16-22,共7页Engineering Plastics Application

基　　金：国家重点研究发展计划项目(2022YFC2803702);招商局海洋装备研究院有限公司项目(CMRD-B038)。

摘　　要：利用硅烷偶联剂KH570对TiO_(2)纳米粒子进行表面改性,然后制备塑化超高分子量聚乙烯(PE-UHMW)/TiO_(2)复合材料,最后通过密炼-模压法制备不同含量和粒子尺寸的TiO_(2)纳米粒子增强PE-UHMW/高密度聚乙烯(PE-HD)复合材料。通过扫描电子显微镜、透射电子显微镜、差示热扫描量热仪、万能试验机、流变仪表征测试复合材料的微观结构、结晶、力学及流变性能。结果表明,低含量的Ti O2纳米粒子(质量分数0.1%)能在聚合物基体中分散良好,使复合材料的力学性能、结晶度及流动性均有显著提升;随粒子尺寸增加,材料强度和刚度降低,断裂伸长率和熔体剪切黏度先增加后降低。然而,高含量粒子分散困难、易形成大的聚集体,导致复合材料性能下降。当TiO_(2)纳米粒子尺寸为5~10 nm、质量分数为0.1%时,复合材料展现出优异的力学性能和加工性能,拉伸强度和拉伸屈服强度分别高达58.21 MPa和44.53 MPa,且熔体剪切黏度下降19.7%。The plasticized ultrahigh molecular weight polyethylene(PE-UHMW)/TiO_(2)composites were prepared after TiO_(2)nanoparticles were modified by silane coupling agent KH570.Finally,TiO_(2)nanoparticles reinforced PE-UHMW/high density poly‐ethylene(PE-HD)composites with different contents and particle sizes of TiO_(2)nanoparticles were prepared by mixing and molding method.The microstructure,crystallization behaviors,mechanical and rheological properties of the composites were revealed by scanning electron microscopy,transmission electron microscopy,differential thermal scanning calorimetry,universal testing machine,and capillary rheological instrumentation.The results show that when the content of TiO_(2)nanoparticles is low(0.1 wt%),the particles are well dispersed in the polymer matrix,which significantly improves the mechanical properties,crystallinity and fluid‐ity of the composites.With the increase of particle size,the strength and rigidity of the composite gradually decrease,while the elon‐gation at break and melt shear viscosity show a trend of first increasing and then decreasing.However,when adding more particles,the performances of the composites deteriorate due to the difficulty of particles dispersion and the formation of large aggregates.When the particle size is 5-10 nm and the content is 0.1 wt%,the composite shows the excellent mechanical properties and process‐ability,with the tensile strength and yield strength up to 58.21 MPa and 44.53 MPa,respectively,and its melt shear viscosity decreases by 19.7%.

关 键 词：超高分子量聚乙烯 高密度聚乙烯 TiO_(2)纳米粒子 力学性能 复合材料 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]