Analysis of Shape Memory Behavior and Mechanical Properties of Shape Memory Polymer Composites Using Thermal Conductive Fillers.

Mijeong Kim,Seongeun Jang,Junghoon Yang,Duyoung Choi,Jungpil Kim,Sungwoong Choi

doi:10.3390/mi12091107

Mijeong Kim, Seongeun Jang + Show 4 more

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https://doi.org/10.3390/mi12091107

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Abstract

Shape memory polymers (SMPs) are attracting attention for their use in wearable displays and biomedical materials due to their good biocompatibility and excellent moldability. SMPs also have the advantage of being lightweight with excellent shape recovery due to their low density. However, they have not yet been applied to a wide range of engineering fields because of their inferior physical properties as compared to those of shape memory alloys (SMAs). In this study, we attempt to find optimized shape memory polymer composites. We also investigate the shape memory performance and physical properties according to the filler type and amount of hardener. The shape memory composite was manufactured by adding nanocarbon materials of graphite and non-carbon additives of Cu. The shape-recovery mechanism was compared, according to the type and content of the filler. The shape fixation and recovery properties were analyzed, and the physical properties of the shape recovery composite were obtained through mechanical strength, thermal conductivity and differential scanning calorimetry analysis.

Highlights

Shape memory materials have the property of remembering and returning to their original form in response to specific external stimuli such as heat, light, current and magnetic fields; heat is the main external stimulus [1,2,3,4,5,6,7]
Shape memory materials are transformed by applying an external force at a high temperature, and the shape is temporarily fixed when they are cooled
The shape memory effects of materials have been studied extensively since they were first discovered in Ni-Ti alloy at the U.S Naval Ordnance Laboratory in 1963, and by the 1980s, they had been put into practical use

Summary

Introduction

Shape memory materials have the property of remembering and returning to their original form in response to specific external stimuli such as heat, light, current and magnetic fields; heat is the main external stimulus [1,2,3,4,5,6,7]. Shape memory materials are transformed by applying an external force at a high temperature, and the shape is temporarily fixed when they are cooled. Later, they return to their original, permanent shape, which they remembered, at temperatures above the glass transition [8,9,10]. If the surrounding temperature rises above the glass transition temperature again, they return to the glassy state and the elastic modulus increases, thereby resulting in the original shape [13].

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