A thermodynamic model for tunable multi-shape memory effect and cooperative relaxation in amorphous polymers

Lu, Haibao, Wang, Xiaodong, Yu, Kai, Fu, Yong Qing and Leng, Jinsong (2019) A thermodynamic model for tunable multi-shape memory effect and cooperative relaxation in amorphous polymers. Smart Materials and Structures, 28 (2). 025031. ISSN 0964-1726

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Official URL: https://doi.org/10.1088/1361-665X/aaf528

Abstract

By integrating phase transition theory and Takayanagi principle, we have developed a thermodynamic model to describe working mechanism and thermomechanical behavior of shape memory polymers (SMPs) with tunable multi-shape memory effect (multi-SME). Thermodynamics and state/phase transitions of different segments in the SMPs were modeled by considering their cooperative relaxation, which is defined as a process where a group of segments undergo relaxation simultaneously, based on the Takayanagi principle. Dependences of thermomechanical behavior of amorphous polymers on volume fraction, cooperative relaxation and glass transition temperatures of both hard and soft segments were theoretically investigated. Working mechanisms of the multi-SME and cooperative relaxation of the amorphous polymers have well been explained using this newly proposed model, which offers an effective approach for designing new SMPs with multi-segments.

Item Type: Article
Subjects: F200 Materials Science
J400 Polymers and Textiles
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 30 Nov 2018 13:05
Last Modified: 06 Feb 2019 15:45
URI: http://nrl.northumbria.ac.uk/id/eprint/36996

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