ABSTRACT

In this work, the thiolized attapulgite (ATP-MTS) particles were prepared by the dealcoholation between hydroxyl and γ-mercaptopropyltrimethoxysilane (MTS). Then, based on the ‘grafting from’ mechanism, the surface-initiated graft polymerization was carried out to give ATP grafted with polymethyl methacrylate hybrid particles (ATP@PMMA). The grafting process was characterized in detail by FTIR, TGA, XRD, XPS, TEM and elemental analysis. The effects of the main polymerization conditions on the grafting ratio were investigated in detail. Finally, polycarbonate (PC) was modified with ATP@PMMA to investigate the effects of hybrid particles on the processability of nanocomposites. The results showed that ATP@PMMA particles with a maximum graft ratio of 23.3% were prepared successfully within 5 h. The optimum polymerization temperature was 60°C, and the ratio of MMA/SH/AIBN was 500/2/1. The surface tailoring improved the dispersion of ATP@PMMA in the matrix. Compared with the pristine PC, the incorporation of ATP@PMMA enhanced the melt flow index (MFI), while reduced the glass transition temperature (T_g) and complex viscosity of nanocomposites.

摘要

在这项工作中，通过羟基和γ-巯基丙基三甲氧基硅烷（MTS）之间的脱醇制备了硫醇化凹凸棒石（ATP-MTS）颗粒。然后，基于“接枝自”机制，进行表面引发的接枝聚合，得到接枝有聚甲基丙烯酸甲酯杂化颗粒（ATP@PMMA）的ATP。通过FTIR、TGA、XRD、XPS、TEM和元素分析对接枝过程进行了详细表征。详细研究了主要聚合条件对接枝率的影响。最后，用 ATP@PMMA 改性聚碳酸酯 (PC) 以研究杂化颗粒对纳米复合材料加工性能的影响。结果表明，在5小时内成功制备了最大接枝率为23.3%的ATP@PMMA颗粒。最佳聚合温度为 60°C，MMA/SH/AIBN的比例为500/2/1。表面修整改善了 ATP@PMMA 在基质中的分散。与原始 PC 相比，ATP@PMMA 的加入提高了熔体流动指数（MFI），同时降低了玻璃化转变温度（T _g ) 和纳米复合材料的复数粘度。