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Shape Memory Polymers (SMPs) are materials capable of changing their primary shape to a secondary shape thanks to the so called Shape Memory Effect (SME) phenomenon. The shape-shifting is achieved through the action of an external stimulus, such as heat, electricity, pH, etc. In this paper, experiments on a thermally actuated thin film of a Shape M...
Context in source publication
Context 1
... above the glass transition temperature of the material, namely 70 • C, the material shows an almost liner behaviour, in accordance with the rubbery nature, without the formation of necking ( Figure 5B). The Young's modulus and the Poisson's ratio determined from the tests are reported in Table 2. ...Similar publications
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Citations
... Textiles applications of shape memory polymeric textiles nanoarchitectures.[31][32][33][34][35][36][37][38][39][40][41] ...
Due to the advent of nanotechnology, deficiencies and limitations inherent in stimuli-responsive shape memory polymeric matrices (SMP), have been effectively mitigated, through the inclusion of a versatile range of organic or inorganic nanoparticulates within the confines of SMP matrice/s. This phenomenon has resulted in the emergence of shape-memory polymeric nanoarchitectures (SMPNs) possessing enhanced and outstanding properties, when compared with the pristine SMP, and this has subsequently enlarged their scope of applications (civil engineering, biomedical gadgets, aerospace, bionics engineering, energy, electronic engineering, household products, and textile engineering). Furthermore, SMPNs enhances athermal stimuli-activities including electroactivity, magneto-activity, water-activity, and photo-activity, as well as shape memory effect (SME) including multiple-shape memory effect (MSME), spatial shape memory effect (SSME), as well as dual-route shape memory effect (DRSME). This elucidation is essential and imperative at this time to enlighten the polymeric universe on new advancements in fabrication, features and applications of stimuli responsive SMPNs. Therefore, this paper, presents, very recently emerging advancements, in construction, characterization, properties and multifunctional applications of stimuli-responsive SMPNs with special emphasis on carbon nanotubes (CNT), carbon nanofibers (CNF), cellulose nanocrystals, and nanoclay reinforced SMPNs. ARTICLE HISTORY
As a result of nanotechnological advancement, parameters inducing flaws in
shape memory polymers (SMP), such as weak mechanical properties, low electrical,
and thermal conductivities, and so on, were mitigated through the inclusion
of a versatile range of nanomaterials such as montmorillonites, carbon
nanotubes, graphene and derivatives, cellulose nanocrystals, carbon nanofibers,
and so on, thereby forming shape memory polymeric nanoarchitectures
(SMPNs). Hence, this work elucidates most recently emerging advancements
on multifunctional SMPNs filled by differing nanoparticulates. Varying multifunctional
SMPNs exhibit responsivity to varying forms of stimulation strategies,
including thermal responsivity, electroactivated, alternating magnetic
field responsivity, light sensitivity, and water induced SMPs. Therefore, this
article presents very recently emerging advancements in the construction,
characterization, properties, and multifunctional applications of stimuli responsive
SMPNs, with special emphasis on functional and stimuli-responsive
SMPNs. Furthermore, important functions of SMPNs such as stimuli-memory
effect and self-mending abilities, as well as prospective strategies for future
progress of these materials are highlighted.
Purpose
The purpose of this study is to investigate the thermomechanical condition on the shape memory property of Polybutylene adipate-co-terephthalate (PBAT). PBAT is a widely researched and rapidly developed biodegradable copolyester. In a tensile test, we found that the fractured PBAT samples had a heat-driven shape memory effect which piqued our interest, and it will lay a foundation for the application of PBAT in new fields (such as heat shrinkable film).
Design/methodology/approach
The shape memory effect of PBAT and the effect of the thermomechanical condition on its shape memory property were confirmed and systematically investigated by a thermal mechanical analyzer and tensile machine.
Findings
The results showed that the PBAT film had broad shape memory transform temperature and exhibited excellent thermomechanical stability and shape memory properties. The shape memory fixity ratio (Rf) of the PBAT films was increased with the prestrain temperature and prestrain, where the highest Rf exceeded 90%. The shape memory recovery ratio (Rr) of the PBAT films was increased with the shape memory recovery temperature and decreased with the prestrain value, and the highest Rr was almost 100%. Moreover, the PBAT films had high shape memory recovery stress which increased with the prestrain value and decreased with the prestrain temperature, and the highest shape memory recovery stress can reach 7.73 MPa.
Research limitations/implications
The results showed that PBAT had a broad shape memory transform temperature, exhibited excellent thermomechanical stability and shape memory performance, especially for the sample programmed at high temperature and had a larger prestrian, which will provide a reference for the design, processing and application of PBAT-based heat shrinkable film and smart materials.
Originality/value
This study confirmed and systematically investigated the shape memory effect of PBAT and the effect of the thermomechanical condition on the shape memory property of PBAT.
