丙烯酸丁酯原位乳液接枝纳米TiO2的研究

为了提高纳米二氧化钛（TiO2）粒予在聚合物基复合材料中的分散性，需要对粒子的表面进行改性。实验采用无皂乳液聚合法，使丙烯酸丁酯单体（BA）在偶联剂KH-570烷基化预处理的纳米TiO2粒子的表面进行接枝聚合，研究了偶联剂用量对烷基化预处理程度的影响，以及聚合条件对TiO2表面接枝效果的影响，并对其聚合机理进行了探讨。结果表明，PBA以化学键成功地接到纳米TiO2的表面，并且可以通过改变接枝聚合条件来调节粒子上所接聚丙烯酸丁酯的结构，为进一步优化纳米粒子填充聚合物复合材料的结构和性能之间的关系建立基础。

Surface Grafting of Nano-TiO2 with Butyl Acrylate by In-situ Emulsion

To improve the dispersibility of nano-TiO2 particles in polymer-base composites, surface modification of the fillers is necessary. By means of in-situ emulsion polymerization, graft polymerization of BA onto the surface of nano-TiO2 was carried out, resulting in PBA was chemically attached to the nano-particles by the double bonds introduced during the pretreatment with a coupling agent KH-570. Also, the factors affecting the grafting yielding on the nano-particles were investigated, including silane content, monomer concentration, initiator consumption, and surfactant concentration. Accordingly, the percent of grafting can be controlled through changing the conditions of polymerization. This provided possibilities for optimizing the structure-property relationships of polymer composites filled with the modified nano-TiO2 particles in our future works.