Exploring Nonlinear Rheological Behaviors in Entangled Semi-flexible Polymer Melts  

作　　者：Li-Cheng Ma Yong-Jin Ruan Zhen-Hua Wang Yu-Yuan Lu Li-Jia An 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei,230026,China

出　　处：《Chinese Journal of Polymer Science》2024年第11期1811-1823,I0014,共14页高分子科学（英文版）

基　　金：financially supported by the National Key R&D Program of China(Nos.2020YFA0713601 and 2023YFA1008800);the National Natural Science Foundation of China(Nos.22341304,22341303,22103079,22073092 and 22303100);the Cooperation Project between Jilin Province and CAS(No.2023SYHZ0003);Additional support for Y.Lu was provided by the Youth Innovation Promotion Association of CAS(No.Y202054)。

摘　　要：This study utilizes molecular dynamics simulation to investigate the complex dynamics of entangled semi-flexible polymer melts.The investigation reveals a significant stress overshoot phenomenon in the systems,demonstrating the intricate interplay between shear rates,chain orientation,and chain stretching dynamics.Additionally,the identification of metastable states,characterized by a dual-plateau phenomenon in the shear stress-strain curve at specific Rouse-Weissenberg number Wi_(R),showcases the system’s responsiveness to external perturbations and its transition to stable shear banding states.Moreover,the analysis of flow field deviations uncovers a progression of shear bands with increasing Wi_(R),displaying distinct behaviors in the system’s dynamics under different shear rates and chain lengths.These findings challenge established theoretical frameworks and advocate for refined modelling approaches in polymer rheology research.

关 键 词：Semi-flexible polymer melts Molecular dynamics simulation Stress overshoot Shear banding ENTANGLEMENT 

分 类 号：TQ317[化学工程—高聚物工业]