新型的高杀菌纳米二氧化钛/聚丙烯复合材料的结构和物理特性研究

THE NOVEL HIGH-ANTIMICROBIAL NANO-TiO_2/PP COMPOSITES AND ITS STRUCTURE AND PROPERTIES

基于一种新型的纳米二氧化钛(TiO2)粉体,利用熔体共混方式制备了纳米TiO2/聚丙烯(PP)复合材料,研究了复合材料的相分散结构、结晶特性、力学性能、杀菌性能和流动性能。结果发现:新型纳米TiO2在聚丙烯中有较好的分散度,绝大多数纳米TiO2在聚丙烯中的聚集体尺寸接近于100纳米;新型纳米TiO2对聚丙烯有一定的结晶成核作用,但并不能提高结晶度;复合材料的力学性能随纳米TiO2含量的增加呈现出拉伸强度下降,伸长率降低,模量和冲击强度上升的趋势。2%纳米TiO2含量的聚丙烯复合材料的综合物理机械性能较好。新型纳米TiO2填充到PP中可以起到良好的抗菌杀菌作用,但也在一定程度上使聚丙烯发生氧化降解,进而导致纳米TiO2/聚丙烯复合材料的流动性略优于纯聚丙烯。

Based on a novel nanoTiO2 powder, Polypropylene/TiO2 composites was made by direct melt blending. The morphology, crystallization, mechanical properties, antimicrobial properties, rheological properties of the new composites were investigated. The results showed that the novel TiO2 nanopowder dispersed well in PP matrix; the sizes of most agglomerates nearly reached 100 nm; TiO2 nanopowder could induce crystallization of PP, however, the crystallinity of PP decreased some; tensile strength and elongation of composites declined while modulus and impact strength of composites rose with the loading of nanopowder; nanoTiO2/PP composites with 2% loading of powder demonstrated an overall excellent mechanical properties. The novel composites have high antimicrobial properties, better flow ability than PP due to degradation of PP caused by the oxidation effect of nanoTiO2. 