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.
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