不同种类聚丙烯加速老化性能对比

Comparative study on accelerated aging performance of different kinds of polypropylene

采用差示扫描量热仪及热重分析仪对无规共聚聚丙烯(PPR)、均聚聚丙烯(PPH)和嵌段共聚聚丙烯(PPB)进行原位热氧加速老化特性研究,分析了老化温度对PPR,PPB,PPH熔点和热稳定性能的影响,并采用傅里叶变换红外光谱仪探究了老化温度与分子结构的关系。结果表明:随着热氧老化温度的上升,试样的老化作用逐渐加剧,总体氧化稳定性变差。在典型供应热水70℃条件下,PPR的使用寿命远大于PPB和PPH,说明PPB和PPH不适用于作为热水管材的材料。

Differential scanning calorimeter(DSC)and thermogravimetric analyzer(TG)in-situ thermal oxygen acceleration were performed on random copolymer polypropylene(PPR),homopolymer polypropylene(PPH)and block copolymer polypropylene(PPB)about their aging characteristics to analyze the effects of aging temperature on the melting point and thermal stability of PPR,PPB and PPH.The relationship between aging temperature and molecular structure were explored by Fourier transform infrared spectroscope(FTIR).The results show that as the thermal oxygen aging temperature increases,the aging effect of the samples gradually increases,and the overall oxidation stability deteriorates.Under the condition of a typical supply of hot water at 70℃,the service life of PPR is much longer than that of PPB and PPH,indicating that PPB and PPH are not suitable for hot water pipe materials.