A ‘frozen volume’ transition model and working mechanism for the shape memory effect in amorphous polymers

摘要: Phenomenological models based on frozen volume parameters could well predict shape recovery behavior of memory polymers (SMPs), but the physical meaning using to describe thermomechanical properties has not been well-established. In this study, fundamental working mechanisms effect (SME) in amorphous SMPs, whose temperature-dependent viscoelastic follows Eyring equation, have established with considerations both internal stress and its resulted volume. The stress-strain constitutive relation was initially modeled quantitatively effects stresses at macromolecular scale transient network theory. A phenomenological 'frozen volume' model then characterize macromolecule structure SME SMPs a two-site stress-relaxation model. Effects stress, strain rate SMP were investigated. Finally, simulation results compared experimental reported literature, good agreements between theoretical achieved. novelty key differences our newly proposed respect previous reports are (1). study is caused by governed theory, thus meaning. (2). can be applied thermal behaviors relationship parameters. It expected provide power tool investigate which characteristics predicted