无规抗冲共聚聚丙烯的非等温结晶动力学  

Non-isothermal crystallization kinetics of random impact copolymerized polypropylene

作　　者：李兴珍 周天达 张庆国[2] 陈振斌[1] 谢昕[2] 吴磊 Li Xingzhen;Zhou Tianda;Zhang Qingguo;Chen Zhenbin;Xie Xin;Wu Lei(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;PetroChina Lanzhou Chemical Research Center,Lanzhou 730060,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]中国石油天然气股份有限公司兰州化工研究中心,甘肃兰州730060

出　　处：《合成树脂及塑料》2023年第4期32-38,56,共8页China Synthetic Resin and Plastics

摘　　要：在Spheripol工艺中试装置上制备了丙丁无规抗冲共聚聚丙烯(记作PP-1)和乙丙丁无规抗冲共聚聚丙烯(记作PP-2),对两种聚丙烯的非等温结晶行为进行了研究,针对无规抗冲共聚聚丙烯实际生产过程中的结晶特点,分别结合Caze法和Mo法提出的理论对非等温结晶动力学Ozawa模型进行了修正。结果表明:采用修正过的两种方法更加符合无规抗冲共聚聚丙烯实际生产过程中的非等温结晶行为。采用Caze法修正Ozawa模型后求出的PP-1和PP-2的Avrami指数分别为2.44,2.37,说明乙烯单体的引入并不会使PP-1的成核机理和生长方式发生改变。采用Mo法修正Ozawa模型后求出的动力学参数F(T)在同一相对结晶度下PP-1小于PP-2,表明在同一时间内PP-2要达到某一结晶度所需冷却速率更大;采用Kissinger法计算的PP-1和PP-2的结晶活化能分别为11.12,14.14 kJ/mol,进一步证实了上述结果。Propylene-butylene random impact copolymerized polypropylene(PP-1)and ethylene-propylenebutylene random impact copolymerized polypropylene(PP-2)were prepared in Spheripol pilot plant.The non-isothermal crystallization behavior of the two samples was investigated.The Ozawa model of non-isothermal crystallization kinetics was modified by combining the theories proposed by Caze and Mo methods,respectively,for the crystallization characteristics of random impact copolymerized polypropylene during actual production.The results show that the two modified methods are more applicable for the non-isothermal crystallization behavior during the actual production of random impact copolymerized polypropylene.The Avrami index for PP-1 and PP-2 obtained by the Ozawa model modified with the Caze method are 2.44 and 2.37,respectively,indicating that the introduction of ethylene monomer does not change the nucleation mechanism and growth mode of PP-1.The kinetic parameter F(T)for PP-1 obtained by the Ozawa model modified by the Mo method is smaller than that for PP-2 at the same relative crystallinity,indicating that the cooling rate required for PP-2 to reach a certain crystallinity within the same time is greater.The activation energies of PP-1 and PP-2 calculated by the Kissinger method are 11.12 kJ/mol and 14.14 kJ/mol,respectively,further confirming the above results.

关 键 词：无规抗冲共聚聚丙烯 非等温结晶动力学 结晶活化能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]