纳米核壳粒子CaCO_(3)/PMMA增强聚丙烯复合材料的性能研究

Study on properties of nano core shell particle CaCO_(3)/PMMA reinforced polypropylene composites

采用雾化微乳液法成功制备10~100 nm范围的纳米碳酸钙(纳米-CaCO_(3))/聚甲基丙烯酸甲酯(PMMA)纳米核壳粒子。聚合物以乙烯基三乙氧基硅烷作为偶联剂接枝到纳米-CaCO_(3)表面,通过透射电子显微镜(TEM)、傅里叶红外变换光谱(FTIR)和X-射线衍射证实了纳米-CaCO_(3)包裹了PMMA,表明纳米-CaCO_(3)粒子与PMMA存在良好的相互作用,这意味着聚合物通过偶联剂的连接成功接枝到纳米-CaCO_(3)表面。不同含量(0.1%~1%)的纳米-CaCO_(3)/PMMA通过布拉本德黏土塑性测定仪与聚丙烯混合。纳米-CaCO_(3)接枝PMMA的明显提高了纳米-CaCO_(3)在PP基体中的分散性,提高了(纳米-CaCO3/PMMA)/PP复合物的热性能、流变性和机械性能。扫描电子显微镜(SEM)和原子力显微镜(AFM)显示,纳米-CaCO_(3)粒子通过PMMA壳在PP基体中分散性良好。

Nano-sized calcium carbonate(nano-CaCO_(3))/poly(methyl methacrylate)(PMMA)core shell particles of 10~100 nm range were successfully prepared by atomization microemulsion method.The polymer was grafted onto the surface of Nano-CaCO_(3) with vinyltriethoxysilane as coupling agent.Transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction confirmed that Nano-CaCO_(3) encapsulated PMMA,indicating that there was a good interaction between Nano-CaCO_(3) particles and PMMA,which means that the polymer was successfully grafted onto the surface of Nano-CaCO_(3) through the coupling agent.Nano-CaCO_(3)/PMMA with different contents(0.1%-1%)was mixed with polypropylene by Brabender clay plasticity tester.PMMA grafted with Nano-CaCO_(3) can obviously improve the dispersion of Nano-CaCO_(3) in PP matrix,and improve the thermal,rheological and mechanical properties of(Nano-CaCO_(3)/PMMA)/PP composites.Scanning electron microscopy(SEM)and atomic force microscopy(AFM)showed that Nano-CaCO3 particles dispersed well in PP matrix through PMMA shell.