The Effect of In situ Melt Pre-shear Induced Oriented Precursors on the Crystallization of Poly(1-butene)/Polypropylene Blends  

作　　者：Wen-Kang Wei Jing-Jing Zhao Chen-Guang Liu Dong Wang Ai-Hua He 

机构地区：[1]Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization,Key Laboratory of Rubber-Plastics(Ministry of Education),School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao,266042,China [2]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing,100029,China

出　　处：《Chinese Journal of Polymer Science》2024年第12期2011-2020,I0012,共11页高分子科学（英文版）

基　　金：supported by the Major Scientific and Technological Innovation Project of Shandong Province(Nos.2019JZZY010352 and 2021CXGC010901);Natural Science Foundation of Shandong Province(No.ZR2020ME079);Taishan Scholar Program.

摘　　要：Melt pre-shear induced crystallization of polymer blends holds great significance in industrial processing and product application.In this work,two typical PB/PP blends(50/50,90/10),possessing commercial value and academic hotspot,were employed to investigate the effect of melt pre-shear on the crystallization of isotactic poly(1-butene)(PB)and polypropylene(PP)by applying shearing slightly above the melting temperature of PP with subsequent non-isothermal crystallization to simulate actual processing conditions.It was discovered that in PB/PP(90/10)blend,in situ melt pre-shear generated oriented PP precursors induced the formation of PP-FIC(Flow-induced crystallization)which acted as row crystal nucleus significantly promoting PB crystallization into spherulite with higher melting temperatures(T_(m)),crystallinity(X_(c)),and thicker lamellar thickness(d_(c)).While in PB/PP(50/50)blend,the melt pre-shear generated PP-shish precursors induced the formation of PP shish-kebab that exerted a confining effect on the crystal growth of PB,resulting in truncated spherulite formation with higher T_(m) and thicker d_(c) but lower X_(c).This research provides insight into the mechanism underlying oriented crystal structure formation,crystal properties,and phase morphology of PB/PP blends under melt pre-shear fields,which have significant theoretical and practical implications for their industrial processing and preparation of high-performance products.

关 键 词：Meltpre-shear PB/PPblends Precursors CRYSTALLIZATION 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]