填充聚丙烯的热氧老化性能研究

Study of Thermal-oxidative Aging Properties of Filled Polypropylene

制备了一种无机矿物填料填充聚丙烯(PP)复合材料,并采用热烘箱老化法,研究了PP的等规度、成核剂、填料的种类与含量及抗氧剂对复合材料热氧老化性能的影响。结果表明,PP的等规度越大,复合材料热氧老化性能越好;成核剂也能提高复合材料的热氧老化性能;填料对复合材料的热氧老化性能有较大影响,其含量越高、粒径越小,复合材料老化性能越差,经表面活化处理的填料体系相比表面未经处理的填料体系具有更好的热氧老化性能;同时也发现,相比对称性受阻酚抗氧剂,非对称性受阻酚抗氧剂能够显著提高复合材料的热氧老化性能。红外光谱表明,聚丙烯在老化过程中,在波数1 730 cm-1产生了典型的羰基C=O强吸收峰,说明聚丙烯分子链发生了老化断裂。

The composites of polypropylene （PP） with inorganic minimal filled were prepared. The effects of isotacticity of PP, nucleating agent, fillers and their content and antioxidant on thermal-oxidative aging properties were investigated by means of oven heating. The results showed that with the increase of isotacticity of PP, the thermal-oxidative aging properties of composites improved. The nucleating agent would improve the thermal-oxidative aging properties of composites. The thermal-oxidative aging properties would decrease with the increase of filler content, with smaller particle size filler and without surface treated. It was also found that the thermal-oxidative aging properties with unsymmetrical hindered phenolic antioxidant were remarkably improved compared with symmetrical hindered phenolic antioxidant. The results of Fourier transition infrared （FFIR） showed that the presence of carbonyl peak at 1 730cm-1 confirmed the thermo-oxidative fracture of PP molecular chain during aging.