高等学校化学学报2026，Vol.47Issue(1)：1-18,18.DOI:10.7503/cjcu20250354
高分子流体剪切带的研究进展与挑战
Progress and Challenges in Shear Banding of Polymer Fluids
摘要
Abstract
Shear banding in polymer fluids represents a paradigmatic example of strain localization under strong nonlinear shear flow,with its physical origin and regulatory mechanisms standing as central scientific questions in polymer rheology.Large-scale molecular dynamics simulations have firmly established shear banding as an intrinsic bulk phenomenon under specific shear conditions,often accompanied by a stress plateau in the steady-state shear stress-shear rate curve.Emerging studies reveal that the spatial localization of shear bands is determined by the initial structural heterogeneity of the entanglement network,where pre-existing"weak spots"in the equilibrium state,such as regions with sparse multiple entanglements,act as nucleation sites for shear stain concentration.Investigations on bidisperse systems further demonstrate that chain-length-dependent migration and selective enrichment drive a"fast-band softening-slow-band hardening"coupling mechanism,which is critical for the long-term stability of shear bands.This review synthesizes recent advances in understanding shear banding,focusing on its intrinsic nature,formation mechanisms,dynamic evolution,and stability,and summarizes the key controversies,challenges,and future research directions in shear band studies.It emphasizes that achieving effective prediction and regulation of shear bands,through the development of high spatiotemporal resolution in-situ characterization techniques and the advancement of multi-scale simulations and theories,will provide critical theoretical support for guiding the precision forming of polymeric materials.This includes controlling rheological uniformity in processes such as injection molding and extrusion,as well as enabling the controlled fabrication of advanced products like ultra-thin films and ultra-fine fibers,thereby significantly enhancing processing efficiency and product performance.关键词
剪切带/非线性流变学/缠结/应变局域化/分子动力学Key words
Shear banding/Nonlinear rheology/Entanglement/Strain localization/Molecular dynamics分类
化学化工引用本文复制引用
LU Yuyuan,AN Lijia..高分子流体剪切带的研究进展与挑战[J].高等学校化学学报,2026,47(1):1-18,18.基金项目
国家自然科学基金(批准号:22341304)和国家重点研发计划项目(批准号:2023YFA1008800,2020YFA0713601)资助. Supported by the National Natural Science Foundation of China(No.22341304)and the National Key Research and Development Program of China(Nos.2023YFA1008800,2020YFA0713601). （批准号:22341304）
