聚丙烯/纳米级金红石型二氧化钛/聚烯烃弹性体复合材料的抗老化性能研究

采用TEM和UV-Vis等测试手段表征了金红石型纳米级TiO2和体相TiO2的性能特征;通过熔融共混法分别制备了PP/纳米级TiO2/POE和PP/体相TiO2/POE复合材料,采用GB/T16422·2-1999所述的塑料实验室光源暴露实验方法,用氙灯气候试验机对纯PP和复合材料进行28天人工加速老化.结果表明,二氧化钛粒子在PP/POE基体中分散性良好,而纳米粒子对PP/POE基体具有增韧作用;改性后的两类复合材料均具有优异的抗老化性能,而PP/(1·0wt%)纳米级TiO2/POE复合材料的抗老化性能更加优异,其加速老化28天后的无缺口冲击强度达到80·45kJ·m-2,比纯PP提高4倍多,而同期加速老化28天后的PP/(1·0wt%)体相TiO2/POE复合材料的无缺口冲击强度只有47·88kJ·m-2;对纯PP老化过程中的羰基指数和冲击性能的变化情况进行了分析,发现二者近似成线性关系,其相关系数r在0·9以上.

STUDY ON AGEING RESISTANCE OF POLYPROPYLENE/NANO-SCALE RUTILE TITANIUM DIOXIDE/POE POLYOLEFIN ELASTOMER COMPOSITES

The properties and features of nano-scale rutile TiO_2 and bulk phase rutile TiO_2 were gained by some methods,suchas TEM,UV-Vis,IR and so on.Polypropylene/POE,polypropylene/nano-TiO_2/POE composites and polypropylene/bulk-TiO_2/POE composites were prepared by a melt-blending process.Polypropylene and composites were degradated in a 28 days accelerated aging test with a laboratory xenon arc lamp(GB/T 16422.2-1999).It was shown that,with the UV shielding capability of nano-scale rutile TiO_2,the ageing resistance of polypropylene was improved,the survice life of polypropylene was prolonged and the tougheness of PP was increased to a great extent too.The ageing resistance of polypropylene/nano-TiO_2/POE composites was better than that of polypropylene/bulk-TiO_2/POE composites.After 28 days exposure to xenon arc lamp the IZOD unnotched impact strength of polypropylene/(1.0 wt%) nano-TiO_2/POE composites was 80.45 kJ·m~-2 which was more than four times as high as that of pure PP.At the same time the impact strength of polypropylene/(1.0 wt%) bulk-TiO_2/POE composites was only 47.88 kJ·m~-2 after 28 days exposure to xenon arc lamp.