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Gholam Reza Mahdavinia

Academic rank: Professor
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Education: PhD.
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Faculty: 1
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Research

Title
Preparation of amorphous nanocomposites with quick heat triggered shape memory behavior
Type
JournalPaper
Keywords
Poly(vinyl acetate); Graphene; Nanocomposite; Mechanical properties; Shape memory polymer
Year
2017
Journal POLYMER
DOI
Researchers Masoud Babaahmadi ، Mohammad Sabzi ، Gholam Reza Mahdavinia ، Mohsen Keramati

Abstract

The aim of this work was to prepare shape memory materials from poly(vinyl acetate) (PVAc), a low-cost commercial polymer, through the simple solution mixing method without need for complex synthetic routes. However, neat PVAc with inherent low strength and modulus exhibited inappropriate shape memory behavior. Therefore, stiff graphene nanoplatelets were incorporated within the PVAc matrix to improve its thermomechanical properties. Transmission electron microscopy (TEM) observations showed that graphene nanoplatelets built up a dense 3D network throughout PVAc. Furthermore, tensile and dynamic mechanical analysis (DMA) results demonstrated that the strength and modulus of PVAc were noticeably enhanced by introducing graphene nanoplatelets. DMA revealed that the PVAc/graphene nanocomposites possess excellent shape memory properties, as the fixation ratio (Rf) and recovery ratio (Rr) could be as high as 99.8 and 98.2%, respectively, and the original shape recovery time was ∼5 s. The remarkable improvement in the shape memory properties of nanocomposites was correlated to great stored elastic strain energy in nanocomposites providing a high driving force for subsequent quick and almost complete shape recovery. In addition, enhanced heat transfer rate in the presence of graphene network can also account for high speed thermal actuation of the developed nanocomposites.