退火对PPR管材结晶行为和抗低温冲击性能的影响分析  

Analysis of the Effect of Annealing on Crystallization Behavior and Low-Temperature Impact Resistance of PPR Pipes

作　　者：程东红 CHENG Donghong(Jiangxi Chen Technology Group Co.,Ltd.,Yichun,Jiangxi Province,330799 China)

机构地区：[1]江西陈氏科技集团股份有限公司,江西宜春330799

出　　处：《科技资讯》2024年第18期108-111,共4页Science & Technology Information

摘　　要：采用差示扫描量热仪、广角X射线衍射仪、扫描电子显微镜,从微观角度探讨退火对无规共聚聚丙烯(Polypropylene Random Copolymer,PPR)管材结晶行为和抗低温冲击性能的影响。结果表明,退火能够有效地提高PPR管材低温下抗冲击性能,在-18℃环境下进行落锤冲击实验,退火后PPR管材的破损比由90%减少至50%。退火不仅可以促进PPR管材内分子链重新排列、提高其规整性、消除PPR管材的热应力,还可以提高PPR管材的结晶度、诱导内部β晶的生成,从而提高其抗冲击韧性。Differential Scanning Calorimeter(DSC),Wide-angle X-ray Diffraction(XRD),and Scanning elec-tron microscope(SEM)are used to investigate the effect of annealing on the crystallization behavior and low-temperature impact resistance of PPR pipes from a microscopic point of view.The results show that annealing can effectively improve the impact resistance of PPR pipe at low temperatures.The damage ratio of PPR pipe is re-duced from 90%to 50%after annealing,as verified by the drop hammer impact test at-18℃.Annealing can not only promote the rearrangement of molecular chains within PPR pipes,improve their regularity,but also eliminate thermal stress in PPR pipes;It can also improve the crystallinity of PPR pipes,induce the formation of internalβcrystals,and thereby enhance their impact toughness.

关 键 词：无规共聚聚丙烯 退火 低温韧性 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]