A cooperative domain model for multiple phase transitions and complex conformational relaxations in polymer with shape memory effect

Lu, Haibao, Wang, Xiaodong, Xing, Ziyu and Fu, Yong Qing (2019) A cooperative domain model for multiple phase transitions and complex conformational relaxations in polymer with shape memory effect. Journal of Physics D: Applied Physics, 52 (24). p. 245301. ISSN 0022-3727

[img] Text
final version of manuscript (Source Files).pdf - Accepted Version
Restricted to Repository staff only until 20 March 2020.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (631kB) | Request a copy
Official URL: https://doi.org/10.1088/1361-6463/ab1190

Abstract

Shape memory polymers (SMPs) are thermo-rheologically complex materials showing significant temperature and time dependences. Their segments often undergo cooperative phase transitions and conformational relaxations simultaneously along with shape memory effect (SME). In this study, a cooperative domain model is proposed to describe the composition dependence, multiple phase transitions and conformational relaxations of SMPs within their glass transition zones. Variations in local-area compositions and cooperative domains of the amorphous SMPs cause significant differences in their segmental relaxation. At a fixed domain size, both intermolecular activation energy and relaxation time significantly influence the SME and thermomechanical properties of the SMPs. Finally, the model is successfully applied to predict the shape memory behavior of SMPs with one stage SME and triple-SME, and the theoretical results have been validated by the experimental ones. This model could be a powerful tool to understand the working mechanisms and provide a theoretical guidance for the designs of multi-SME in SMPs.

Item Type: Article
Uncontrolled Keywords: Conformational relaxation, shape memory polymer, cooperative, model
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 18 Mar 2019 15:43
Last Modified: 11 Apr 2019 16:00
URI: http://nrl.northumbria.ac.uk/id/eprint/38434

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence