纳米TiO_2对聚丙烯抗紫外老化作用研究

Study on the effect of nano-TiO_2 on UV aging resistance of polypropylene

以马莱酸酐接枝聚丙烯(PP-g-MAH)为纳米TiO2分散基体,采用母料法制备PP/PP-g-MAH/nano-TiO2纳米复合材料.DSC,TEM,力学性能测试、断面形貌观察、PP球晶形态分析、紫外人工加速老化试验等结果表明:纳米TiO2能使聚丙烯的抗紫外老化性能显著提高,而对其力学性能影响不大;纳米TiO2在聚丙烯中分散越均匀、粒径越小,越有利于提高聚丙烯的抗紫外老化性能.

The nanocomposite of polypropylene （PP）/polypropylene-graft-maleic anhydride （PP-g-MAH）/nano-TiOz was prepared by masterbatch compounding method using PP-g-MAH as a masterbatch matrix. The influence of nano-TiO2 masterbatch on PP＇s resistance to UV aging was analyzed by DSC, TEM, polarized light optical microseope（PLM）, surface aspects, melting flowing rate（MFR） and mechanical properties, respectively. It was found that the composite PP/ Pp-g-MAH/nano-TiO2 showed better resistance to UV aging than the pure PP, and the dispersion of nano-TiO2 in PP that was of importance for the PP＇ resistance to UV aging could be effectively improved by using masterbatch compounding method.