Carbon-based reinforcement in shape-memory polymer composite for electrical actuation

Lu, Haibao; Yao, Yongtao; Lin, Long

doi:10.1108/prt-08-2013-0075

Cited by 43 publications

(33 citation statements)

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“…finite strain elasto-plastic analysis, shear bands, spherical and slender fillers, strain softening and hardening 1 | INTRODUCTION Rigid filler-reinforced polymers are used in several engineering applications such as in coatings and insulation [1] , microelectronic and bio-medical devices [2] , aerospace and structural components [3] , and shape memory structures [4,5] . Invariably, the functionality and reliability of the components depend upon the mechanical and fracture response of their constituent composites.…”

Section: Introductionmentioning

confidence: 99%

Deformation characteristics of glass‐filled epoxy composite under compression: Role of filler shape and volume fraction

2019

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The influence of filler shape on the compression behavior of low‐volume fraction glass‐filled epoxy composite is studied. Test materials are prepared by embedding two filler variants, spherical and slender, up to 10% volume fraction into the matrix. Although the slender fillers improve the yield and strain hardening characteristics of epoxy, the effect of spherical ones is observed only on the latter. The trends remain the same but magnifies when the filler content is increased. Optical analyses of deforming specimens reveal extensive presence of shear bands. The crushed sample micrographs show broken fillers and severe matrix cracking, indicating significant resistance to deformation provided by the slender fillers, whereas the debonded spherical particles appear to have lesser impact on the deformation characteristics. Finite strain elasto‐plastic finite element analyses on representative volume elements complement experimental observations. Simulations clearly indicate that the deformation in slender filler composites are filler dominated. On the contrary, due to large inter particle spacing, the matrix governs the deformation response in spherical particle composites. Interestingly, in any case, the inclusion shape has no effect on the average matrix stress.

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Section: Introductionmentioning

confidence: 99%

Deformation characteristics of glass‐filled epoxy composite under compression: Role of filler shape and volume fraction

2019

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“…Therefore, a great number of research works have been carried out to achieve the electrical actuation of SMPs (Lu et al, 2009;Lu et al, 2010;Luo and Mather, 2010;Le et al, 2011;Lu et al, 2011b;Lu et al, 2011a;Fejos et al, 2012;Lu, 2012a;Lu, 2012b;Fejos and Karger-Kocsis, 2013;Lu et al, 2013;Lu et al, 2013c;Lu et al, 2014b). In practice, the use of a variety of electrically conductive filler is essential for the electrically conductive SMP composites due to the fact that most pristine SMPs are inertness to electricity.…”

Section: Introductionmentioning

confidence: 99%

Functionally graded carbon nanotube and nafion/silica nanofibre for electrical actuation of carbon fibre reinforced shape memory polymer

Yao

Yin

et al. 2016

Pigment &Amp; Resin Technology

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Functionally graded carbon nanotube and nafion/silica nanofibre for electrical actuation of carbon fibre reinforced shape memory polymer Purpose -To study the synergistic effect of self-assembled carboxylic acid-functionalised carbon nanotube (CNT) and nafion/silica nanofibre nanopaper on the electro-activated shape memory effect (SME) and shape recovery behaviour of shape memory polymer (SMP) nanocomposite.Design/methodology/approach -Carboxylic acid-functionalised CNT and nafion/silica nanofibre are first self-assembled onto carbon fibre by means of deposition and electrospinning approaches, respectively, to form functionally graded nanopaper. The combination of carbon fibre and CNT is introduced to enable the actuation of the shape memory effect in SMP by means of Joule heating at a low electric voltage of 3.0-5.0 V.Findings -Nafion/silica nanofibre is employed to improve the shape recovery behaviour and performance of the SMP for enhanced heat transfer and electrical actuation effectiveness. Low electrical voltage actuation and high electrical actuation effectiveness of 32.5% in SMP has been achieved.Research implications -A simple way for fabricating electro-activated SMP nanocomposites has been developed by using functionally graded CNT and nafion/silica nanofibre nanopaper.Originality/value -The outcome of this study may help the fabrication of SMP composites with high electrical actuation effectiveness under low electrical voltage actuation.

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“…The phase or domain showing the highest thermal transition is responsible for the permanent shape. The other is the switching phase or domain that has, on the other hand, the ability to soften and is responsible for the temporary shape (Lendlein and Kelch 2002;Dietsch and Tong 2007;Lu and Huang 2013b;Lu et al, 2013;Sun et al, 2014;Lu and Du 2014). SMPs can retain two or sometimes three shapes, and cover a wide property ranging from stable to biodegradable, from soft to hard, and from elastic to rigid (Tobushi et al, 2001;Miaudet et al, 2007;Sun and Huang 2010).…”

Section: Introductionmentioning

confidence: 99%

“…shape memory effect (SME)] (Mather et al, 2009;Xie, 2011;Sun et al, 2012). SMPs could be manipulated and ÒfixedÓ to a temporary shape under specific conditions of temperature and stress, and subsequently relax to the permanent state upon application of external stimuli, such as heat, light, magnetic field, or electrically resistive heating (Lendlein and Langer, 2002;Meng and Hu 2009;Liu et al, 2009;Lu and Gou 2012;Hu et al, 2012;Zhao et al, 2012;Lu et al, 2013;Lu et al, 2014a). The mechanism behind shape memory capability lies in their molecular network structure, which contains at least two separate phases or domains (Rousseau 2008;Nguyen et al, 2008;Xie 2010;Huang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Most of the current research in the field of SMPs is focused on the intrinsic function of the SME, functional composite, the exploitation of different stimuli as triggers and demonstration of potential application (Ma et al, 2013;Bellin et al, 2006;Tobushi et al, 2008;Lu et al, 2009;Lu et al, 2010;Luo and Mather 2010;Lantada et al, 2010;Le et al, 2011;Lu et al, 2011b;Lu et al, 2011a;Fejos et al, 2012;Lu 2012a;Lu 2012b;Fejos and Karger-Kocsis 2013;Lu et al, 2013;Lu et al, 2013c;Lu et al, 2014b).…”

Section: Introductionmentioning

confidence: 99%

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Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

Yao

Lin

2015

Pigment &Amp; Resin Technology

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Purpose -The study reported here intended to create and to study multifunctional shape memory polymer (SMP) composite having temperature sensing and actuating capabilities by embedding thermochromic particles within the polymer matrix.Design/methodology/approach -The multifunctional materials were fabricated following a process consisting of blending (of the thermochromic particles and the SMP at various ratios), mixing, degasing, moulding and thermal curing, thus incorporating thermochromic particles within the polymer. The effect of the thermochromic particles on the thermomechanical properties and thermally responsive shape memory effect (SME) of the resulting multifunction SMP composites were characterised and interpreted.Findings -It was found that exposure of the composites to temperatures above 70°C led to a pronounced, reproducibly reversible change of their colour that was recorded by the thermal and electrical actuation approaches. It was also found that the colour of the composites was independent of the mechanical state of the SMP. Such effects enabled monitoring of the onset of the set/release temperature of the SMP matrix. Furthermore, the combination of thermochromic additive and the SMP resulted in significantly improved thermomechanical strength, absorption of infrared radiation and temperature distribution of the SMP composites.1 Corresponding author, e-mail: yaoyt@hit.edu.cnResearch implications -The temperature sensing and actuating capabilities of the polymeric shape memory composites developed through this study will help to extend the field of potential applications of such composites to fields including sensors, actuators, security labels and information dissemination, where colour indication is an advantageous feature.Originality/value -The shape memory polymer (SMP) composites capable of temperature sensing and actuating are novel.

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Carbon-based reinforcement in shape-memory polymer composite for electrical actuation

Cited by 43 publications

References 44 publications

Deformation characteristics of glass‐filled epoxy composite under compression: Role of filler shape and volume fraction

Deformation characteristics of glass‐filled epoxy composite under compression: Role of filler shape and volume fraction

Functionally graded carbon nanotube and nafion/silica nanofibre for electrical actuation of carbon fibre reinforced shape memory polymer

Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

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