典型湿热自然环境对不同聚丙烯结构和性能的影响

Effect of Typical Wet-Hot Climates on Structure and Properties of Different Polypropylenes

通过共聚聚丙烯(PP1)与均聚聚丙烯(PP2)在中国三亚、琼海、广州自然曝晒试验结果的对比,研究了湿热自然环境对2种PP表面形貌、表观性能和微观结构的影响。结果显示:2种PP在湿热自然环境曝晒过程中均出现了明显的表面裂纹,其表观性能也有较大的变化,其中PP1抗老化能力比PP2优越;PP1和PP2经曝晒后在分子链上产生羰基,且羰基量随曝晒时间的延长而增加。

Natural weathering experiments of copolymerized and homopolymerized polypropylenes（PP） were performed in Sanya,Qionghai and Guangzhou which were in wet-hot climates. The effect of typical wet-hot climates on their surface morphology, apparent properties and microcosmic structure was studied, and the different weathering behavior was compared. During the natural exposure, crackles gradually appeare and apparent properties obviously were changed on different PP surfaces. The weathering resistance of copolymerized polypropylene was stronger than that of homopolymerized polypropylene. Carbonyl group had been introduced into molecular chains of different PP after exposure, its content increased with the increasing of exposure time.