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 

机构地区：[1]State Key Laboratory of Molecular Engineering of Polymers,Department of Macromolecular Science,Fudan University,Shanghai,200433,China [2]Lanzhou Petrochemical Corporation of PetroChina,Lanzhou,730060,China [3]Lanzhou Petrochemical Research Center,Petrochemical Research Institute of PetroChina,Lanzhou,730060,China

出　　处：《Chinese Journal of Polymer Science》2024年第2期213-222,I0008,共11页高分子科学（英文版）

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

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.

关 键 词：Metallocene-made isotactic polypropylene TALC Melt memory effect Crystal orientation 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]