Near-Infrared Light-Responsive Shape Memory Polymer Fabricated from Reactive Melt Blending of Semicrystalline Maleated Polyolefin Elastomer and Polyaniline.

Min-Su Heo,Keon Soo Jang,Tae-Hoon Kim,Young-Wook Chang

doi:10.3390/polym13223984

Min-Su Heo, Keon Soo Jang + Show 2 more

Open Access

https://doi.org/10.3390/polym13223984

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Journal: Polymers	Publication Date: Nov 18, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Hanyang University, University of Suwon

Abstract

A shape memory polymer was prepared by melt mixing a semicrystalline maleated polyolefin elastomer (mPOE) with a small amount of polyaniline (PANI) (up to 15 wt.%) in an internal mixer. Transmission electron microscopy (TEM), FTIR analysis, DMA, DSC, melt rheological analysis, and a tensile test were performed to characterize the structure and properties of the mPOE/PANI blends. The results revealed that the blends form a physically crosslinked network via the grafting of PANI onto the mPOE chains, and the PANI dispersed at the nanometer scale in the POE matrix served as a photo-thermal agent and provided increased crosslinking points. These structural features enabled the blends to exhibit a shape memory effect upon near-infrared (NIR) light irradiation. With increasing PANI content, the shape recovery rate of the blend under NIR stimulation was improved and reached 96% at 15 wt.% of PANI.

Highlights

A shape memory polymer (SMP) is a smart material that can memorize its original shape and recover to its original shape from temporarily fixed shapes, and responds to various types of external stimuli, such as heat, light, water, and electric or magnetic fields
The most frequently employed approach to fabricate light-responsive SMPs is the incorporation of small amounts of photothermal reagents, such as gold [11], silver [12], titanium nitride [13], polydopamine [14], porphyrin [15], or carbon nanoparticles, such as CNT and graphene [16,17,18,19], into the shape memory polymer matrix
These additives act as photothermal heaters when the composites are irradiated with near infrared or sunlight, which enables the SMP nanocomposites to be indirectly heated above their transition temperature

Summary

Introduction

A shape memory polymer (SMP) is a smart material that can memorize its original shape and recover to its original shape from temporarily fixed shapes, and responds to various types of external stimuli, such as heat, light, water, and electric or magnetic fields. The most frequently employed approach to fabricate light-responsive SMPs is the incorporation of small amounts of photothermal reagents, such as gold [11], silver [12], titanium nitride [13], polydopamine [14], porphyrin [15], or carbon nanoparticles, such as CNT and graphene [16,17,18,19], into the shape memory polymer matrix These additives act as photothermal heaters when the composites are irradiated with near infrared or sunlight, which enables the SMP nanocomposites to be indirectly heated above their transition temperature. Polypyrrole was incorporated into a shape memory polyurethane to prepare an NIR-induced shape memory elastomer [26] Despite their excellent light-responsive behaviors, solution processing was needed to fabricate these SMPs, which was complicated and time consuming. Along with the examinations of photo-responsive shape memory effects, the thermo-mechanical and rheological properties of the blends were investigated

Materials and Sample Preparation

Characterization

Phase Morphology

Dynamic Mechanical Properties

Tensile Properties