金红石型TiO2对聚丙烯纤维紫外光降解的影响

分析了聚丙烯(PP)／金红石型二氧化钛(TiO2)共混纤维在人工加速紫外光降解中断裂伸长率、断裂强度、质量损失和表面形态的变化,与PP纤维进行对比,研究了纳米级和微米级金红石型TiO2对共混纤维光降解的影响。结果表明,在紫外光照射下,共混纤维中金红石型TiO2的含量越高,PP纤维断裂伸长率、断裂强度的降低和质量损失速率就越快;同时由扫描电镜照片发现,经紫外光照射120 h后,纤维表面损伤程度也随着TiO2添加量的增多而加深。纳米级和微米级金红石型TiO2都对PP的光氧化降解具有一定的催化作用,而且其含量越高,催化作用越强,但纳米级TiO2的催化作用比微米级TiO2大。

Influence of rutile-type TiO2 on photodegradation of polypropylene fiber

The change of polypropylene (PP)/rutile-type titanium dioxide (TiO2) blend fiber was analyzed in ultimate elongation and tensile strength, weight mass loss and morphology during artificial accelerated ultraviolet photodegradation and was compared with that of pure PP fiber. The effect of rutile-type TiO2 microparticles or nanoparticles on the photodegradation of PP/TiO2 blend fibers was studied. The results showed that the more rutile-type TiO2 particles the PP/TiO2. fiber contained, the faster the ultimate elongation, tensile strength and weight mass loss were decreased. The SEM photographs showed that the damages on the fiber surface were increased with TiO2 addition after ultraviolet irradiating for 120 h. Rutile-type TiO2 microparticles and nanoparticles both had a certain catalytic effect on the photodegradation of the blend fiber, which was enhanced while increasing TiO2 a-mount. And TiO2 nanoparticles had the photosensitive activity higher than TiO2 microparticles.