A coupling model for cooperative dynamics in shape memory polymer undergoing multiple glass transitions and complex stress relaxations

Wang, Xiaodong, Liu, Yuheng, Lu, Haibao, Wu, Nan, Hui, David and Fu, Richard (2019) A coupling model for cooperative dynamics in shape memory polymer undergoing multiple glass transitions and complex stress relaxations. Polymer, 181. p. 121785. ISSN 0032-3861

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Official URL: https://doi.org/10.1016/j.polymer.2019.121785

Abstract

Modelling multi-shape memory effect (multi-SME) of shape memory polymers (SMPs) is a critical challenge for fields of engineering, mathematics/statistics and condensed-matter physics. These SMPs have a huge number of segments and their thermomechanical behaviors are determined by heating methods/history and cooperative relaxations (e.g., relaxation of all segments occurs simultaneously). In this study, a one-dimensional coupling model was proposed to investigate the cooperative dynamics of multiple glass transitions and thermomechanical behaviors of the SMPs. The overall relaxation behaviors of different tangled segments in the SMPs were formulated based on the Boltzmann’s superposition principle by coupling the highest
transition temperature ( max T ) and initial transition temperature ( min T ) of all segments.
Dependences of thermomechanical properties and relaxation strains upon the
parameters of max T , min T , relaxation time and heating rate were theoretically
investigated. Multiple glass transitions, thermomechanical and shape memory
behaviors of the SMPs have been well described using this newly proposed coupling
model. Finally, the simulation results were compared with the experimental data, and
good agreements between them were obtained.

Item Type: Article
Uncontrolled Keywords: shape memory polymer, shape memory effect, cooperative dynamics
Subjects: F100 Chemistry
F200 Materials Science
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 09 Sep 2019 08:31
Last Modified: 11 Oct 2019 13:19
URI: http://nrl.northumbria.ac.uk/id/eprint/40571

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