中文摘要：

以聚丙烯（PP）/碳酸钙为研究对象,以复合材料界面为着眼点,探讨了不同的填料粒径和表面组成对复合材料光氧老化的影响,并提出了相关机理.首先,文中认为聚合物/无机填料界面面积与界面化学组成是影响老化速率的关键因素.聚合物与碳酸钙的总界面面积的增大会加速PP的光氧老化,不同偶联剂处理会改变碳酸钙的表面化学特性进而对PP老化产生促进或抑制.在此基础上提出了基于界面的老化反应速率概念及相应模型.其次,在老化领域采用了＂界面放大＂的实验方案,验证了碳酸钙对PP的老化促进很大程度上来源于碳酸钙表面的化学组成.此外,研究发现采用表面处理剂钛酸酯改性的碳酸钙能大大促进PP的老化,且表现为钛酸酯与碳酸钙的协同效果.

英文摘要：

The effects of the inorganic particle size and the surface chemicals on the photo-oxidation of PP /CaCO3 composites are investigated,especially from the aspect of interface.Firstly,it is at the interface that the effect of filler particles on the photo-oxidation of PP matrix takes place.The interfacial area and chemicals of CaCO3 particles are proved to be key factors that change the photo-oxidation rate of PP.A larger interfacial area leads to a faster photo-oxidation,so the PP / nano-CaCO3composite（PP / nm CaCO3） photo-degraded faster than the PP / micro-CaCO3composite（PP / μm CaCO3） with the same load of CaCO3.Surface treatment with different coupling agents changes the surface chemicals of CaCO3 and thus the photo-oxidation rate.Based on this,a model of the photo-oxidation of polymer composites was developed,and the reaction rate formula was put forward for the first time.Secondly,an interfacial enlargement experiment,which is also the first trial in this field,was carried out.This experiment confirmed that the surface chemicals on CaCO3 particles largely accelerated the aging of PP during photo-oxidation.Meanwhile,titanate treated CaCO3 could accelerate the photo-oxidation of PP greatly,and a synergistic effect between titanate and CaCO3 was observed.