加工与老化对等规聚丙烯结构与性能的影响  

Effect of Processing and Aging on Structure and Properties of Isotactic Polypropylene

作　　者：胡全超[1,2] 辛超 黄立辉 李仪 赵永仙 HU Quan-chao;XIN Chao;HUANG Li-hui;LI Yi;ZHAO Yong-xian(Key laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Labortory of Rubber-Plastics,Qingdao University of Science and Technology,Qingdao 266042,China;Keshun Waterproof Technology Co.,Ltd.,Foshan 528305,China)

机构地区：[1]青岛科技大学橡塑材料与工程教育部重点实验室/山东省橡塑材料与工程重点实验室,山东青岛266042 [2]科顺防水科技股份有限公司,广东佛山528305

出　　处：《塑料科技》2022年第11期55-60,共6页Plastics Science and Technology

基　　金：山东省重点研发计划(公益类)立项(2019GGX102068);山东省自然科学基金(ZR2020MB041)。

摘　　要：采用熔融挤出、热氧老化模拟等规聚丙烯(iPP)加工及老化过程,并对不同老化程度样品的结构与性能进行研究。结果表明:加工、老化过程对iPP的结构、热学性能、流变性能均有影响。通过Avrami和Kissinger法研究非等温结晶动力学,Kissinger法中iPP、熔融挤出i PP和热氧老化iPP样品的非等温结晶活化能分别为-224.1、-231.5和-256.1 k J/mol,聚丙烯原料经加工、老化作用结晶能力提高。通过Friedman微分法进一步研究非等温结晶活化能与相对结晶度的关系。当相对结晶度升高,结晶活化能增加,非等温结晶活化能随老化程度加剧而降低。The processing and aging process of isotactic polypropylene(iPP) were simulated by melt extrusion and thermal oxidative aging,and the structure and properties of samples with different aging degrees were studied.The results show that the structure,thermal and rheological properties of i PP are affected by processing and aging.The non-isothermal crystallization kinetics is studied by Avrami and Kissinger methods.The non-isothermal crystallization activation energies of iPP,melt extruded iPP and thermo-oxidative aged i PP samples in Kissinger method are-224.1,-231.5 and-256.1 kJ/mol,respectively.The crystallization ability of polypropylene raw materials is improved by processing and aging.The relationship between non-isothermal crystallization activation energy and relative crystallinity is further studied by Friedman differential method.When the relative crystallinity increases,the crystallization activation energy increases,and the non-isothermal crystallization activation energy decreases with the increase of aging degree.

关 键 词：等规聚丙烯 热氧老化 流变性能 Friedman微分法 非等温结晶动力学 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]