纳米硫酸钡/聚乙烯复合材料的制备及其加速老化性能
Preparation and accelerated-aging properties of barium sulfate nanoparticles/polyethylene composites

运用熔融共混方法制备了可X光显影的纳米硫酸钡(n-BaSO4)/聚乙烯(PE)复合材料。研究了铝酸酯偶联剂改性n-BaSO4 (Al-n-BaSO4)在PE基体中的分散情况、复合材料的力学性能以及加速老化性能。运用XRD、FTIR、SEM及万能拉伸试验机等表征了产物的形貌、结构、力学性能及填料分布。结果表明: 铝酸酯偶联剂与n-BaSO4表面基团发生了化学键合, 在Al-n-BaSO4/PE体系中Al-n-BaSO4粒子的分散性较好, 且平均粒径小于100 nm。Al-n-BaSO4/PE复合材料的最大拉伸强度为11.87 MPa, 弯曲强度为6.61 MPa, 断裂伸长率为66.78%。Al-n-BaSO4/PE复合材料在模拟宫腔液中进行14周的加速老化实验后, 复合材料的拉伸强度仅下降了5%~15%, 预期Al-BaSO4/PE复合材料能在人体中使用10年以上。 X-ray developing barium sulfate nanoparticles (n-BaSO4)/polyethylene (PE) composites were prepared by melt-blending. The dispersibility of aluminum coupling agent modified n-BaSO4 (Al-n-BaSO4) in PE matrix, mechanical properties and accelerated-aging properties of composites were investigated. The morphology, structure, mechanical properties and filler distribution of the products were characterized by XRD, FTIR, SEM and universal tensile testing machine. The results indicate that chemical bonding occurs between aluminum coupling agent and surface groups of n-BaSO4. The Al-n-BaSO4 nanoparticles disperse well in Al-n-BaSO4/PE system, and the average portical size is less than 100 nm. The maximum tensile strength of Al-n-BaSO4/PE composites is 11.87 MPa, flexural strength is 6.61 MPa, and elongation rate is 66.78%. After 14 weeks accelerated-aging experiment of Al-n-BaSO4/PE composites in simulated uterine solution, the tensile strength of composites only decreases by 5%-15%. The Al-n-BaSO4/PE composites are expected to use in human bodies for over 10 years. 国家自然科学基金(51371126)