Significantly Enhanced Melt Memory Effect of Metallocene-made Isotactic Polypropylene Containing Talc

作     者：Hong-Wen Sun Fu-Shan Wang Yan Gao Fu-Qing Wei Jia-Chun Feng Hong-Wen Sun;Fu-Shan Wang;Yan Gao;Fu-Qing Wei;Jia-Chun Feng

作者机构：State Key Laboratory of Molecular Engineering of PolymersDepartment of Macromolecular ScienceFudan UniversityShanghai200433China Lanzhou Petrochemical Corporation of PetroChinaLanzhou730060China Lanzhou Petrochemical Research CenterPetrochemical Research Institute of PetroChinaLanzhou730060China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2024年第42卷第2期

页      面：213-222,I0008页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51973037 and 52173056) PetroChina Company Limited,China 

主　　题：Metallocene-made isotactic polypropylene Talc Melt memory effect Crystal orientation 

摘      要：The melt memory effect is a widely observed phenomenon in semi-crystalline polymers. In practical applications, various additives are usually introduced into polymers, which may affect their melt memory behavior. In this work, the effect of talc on the melt memory effect of metallocene-made isotactic polypropylene(M-PP) was investigated in detail by using the differential scanning calorimetry. The results indicated that the introduction of talc significantly strengthened the melt memory effect of M-PP. Specifically, the upper limit temperature of Domain II increased from 161 ℃ to 174 ℃, resulting in a substantial widening of the temperature range of Domain IIa from 1 ℃ to 14 ℃. Analysis of the crystal orientation of the M-PP containing talc cooled from various Ts suggested that the remarkably enhanced melt memory effect could be ascribed to the stabilization of oriented nuclei facilitated by talc. This stabilizing effect was likely attributable to the prefreezing effect or the sorption interaction between talc and the M-PP chains.