Thermodynamically-consistent constitutive modeling of moisture- and thermo-responsive shape memory polymers

IF 3.7 3区材料科学 Q1 INSTRUMENTS & INSTRUMENTATION

Smart Materials and Structures Pub Date : 2024-08-29 DOI:10.1088/1361-665x/ad70e3

Jianping Gu, Changchun Wang, Xiaopeng Zhang, Hao Zeng, Mengqi Wan, Huiyu Sun

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引用次数: 0

Abstract

Taking into account that shape memory polymer (SMP)-based devices are often subject to multiple environmental conditions during application, it is difficult to accurately predict their shape memory effect (SME). Thus, constitutive modeling for SMPs in multi-field environments is of great importance. However, most of the models available are limited to describing the temperature-driven SME and do not refer to multi-field conditions. In this paper, a constitutive model for SMPs in hygrothermal environments is developed under a consistent thermodynamic framework. The derivation is based on an additive decomposition of the Helmholtz free energy density and satisfying the first law and second law of thermodynamics. In this paper, the absorbed moisture is categorized into free and bound phases and it is considered that they have different effects on the material properties. Accordingly, it is the first time to study the variation of configurational entropy with different phases in the polymer–moisture system during the moisture diffusion process. For the first time, the validity of the constitutive model proposed in this paper can be confirmed by systematically comparing the modeling results and experimental data of various types of hygrothermal-induced shape memory cycles.

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湿热响应型形状记忆聚合物的热力学一致构成模型

考虑到基于形状记忆聚合物（SMP）的设备在应用过程中通常会受到多种环境条件的影响，因此很难准确预测其形状记忆效应（SME）。因此，建立多场环境下的 SMP 构成模型非常重要。然而，现有的大多数模型仅限于描述温度驱动的 SME，并未涉及多场条件。本文在一个一致的热力学框架下，为湿热环境中的 SME 建立了一个构造模型。该模型的推导基于亥姆霍兹自由能密度的加法分解，并满足热力学第一定律和第二定律。本文将吸收的水分分为自由相和结合相，并认为它们对材料特性有不同的影响。因此，本文首次研究了聚合物-水分体系在水分扩散过程中构型熵随不同相的变化。通过系统比较各种类型湿热诱导形状记忆循环的建模结果和实验数据，首次证实了本文提出的构成模型的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Smart Materials and Structures 工程技术-材料科学：综合

CiteScore

7.50

自引率

12.20%

发文量

317

审稿时长

3 months

期刊介绍： Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.