Due to the poor low-temperature brittleness of PPR pipes in cold environments,it is essential to enhance the low-temperature toughness of PPR pipes for their broader applications.Composite PPR pipes with excellent low-temperature toughness were prepared by adding toughened materials to the PPR raw material.This paper studied the effect of toughened materials on the low-temperature impact resistance and crystallization behavior of PPR pipes.The results of low-temperature impact resistance show that the toughened materials(POE,WBG-II,LLDPE)can effectively improve the impact resistance of PPR pipe at low temperatures.The impact breakage ratio of PPR/POE and PPR/POE/WBG-II composite pipe at-18℃is 10%and 5%,respectively,whereas the impact breakage ratio of PPR/POE/WBG-II/LLDPE composite PPR pipe is 35%.In terms of crystallization behavior,the addition of POE,WBG-II,and LLDPE reduces the crystallinity of α crystal in PPR pipe and promotes the formation of β crystal,thus improving the low-temperature toughness of the PPR pipes.
关键词
无规共聚聚丙烯/低温韧性/力学性能
Key words
random copolymer polypropylene/low temperature toughness/mechanical properties
维普
万方数据