2001/05/13 by Aleksey D. Drozdov, Drozdov, Aleksey D., Joachim Kaschta +1
Chemical Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Polymer Nanocomposites and Properties #Polymer crystallization and properties #Rheology and Fluid Dynamics Studies #Soft Condensed Matter (cond-mat.soft) #cond-mat.mtrl-sci #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.cond-mat/0105251
27 pages, 14 figures
arxiv created 2001/05/13 · openalex publication_date 2001/05/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The time-dependent response of polystyrene and poly(methyl methacrylate) is\nstudied in isothermal long-term shear creep tests at small strains and various\ntemperatures in the vicinity of the glass transition point. A micromechanical\nmodel is derived to describe the experimental results. Constitutive equations\nare developed under the assumption that the behavior of amorphous polymers is\ngoverned by two micro-mechanisms: rearrangement of cooperatively relaxing\nregions (CRR) reflects the viscoelastic response, whereas displacement of CRRs\nwith respect to each other is responsible for the anelastic response. It is\ndemonstrated that some critical temperature exists slightly above the glass\ntransition temperature, where the dependences of adjustable parameters on\ntemperature are dramatically changed. The critical temperature is associated\nwith transition from dynamic heterogeneity in amorphous polymers to static\ninhomogeneity.\n