Active composites based on shape memory polymers: overview, fabrication methods, applications, and future prospects

Melly, Stephen Kirwa; Liu, Liwu; Liu, Yanju; Leng, Jinsong

doi:10.1007/s10853-020-04761-w

Cited by 77 publications

(41 citation statements)

References 449 publications

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“…Filler dispersed materials have been used to improve shape recovery characteristics, such as increasing the recovery rate and recovery force exerted by the material. In the same way, the effects of continuous fibres within an SMP matrix have been investigated to obtain high load-bearing SMPCs (Khoo et al, 2015;Melly et al, 2020;Meng and Li, 2013;Sadasivuni et al, 2019;Xin et al, 2019).…”

Section: Overview Of Shape Memory Polymer Compositesmentioning

confidence: 99%

“…Addition of particles, short or long reinforcements or other polymer-based filler materials can enhance the recovery, stiffness and strength, thermal and electrical conductivity, as well as magnetic shielding and barrier properties. Improvements on these properties by particle doping have been covered in many reviews with respect to conventional manufacturing techniques (Khoo et al, 2015;Melly et al, 2020;Meng and Li, 2013;Sadasivuni et al, 2019;Xin et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Advances in additive manufacturing of shape memory polymer composites

Garces

Ayranci

2021

RPJ

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Purpose A review on additive manufacturing (AM) of shape memory polymer composites (SMPCs) is put forward to highlight the progress made up to date, conduct a critical review and show the limitations and possible improvements in the different research areas within the different AM techniques. The purpose of this study is to identify academic and industrial opportunities. Design/methodology/approach This paper introduces the reader to three-dimensional (3 D) and four-dimensional printing of shape memory polymers (SMPs). Specifically, this review centres on manufacturing technologies based on material extrusion, photopolymerization, powder-based and lamination manufacturing processes. AM of SMPC was classified according to the nature of the filler material: particle dispersed, i.e. carbon, metallic and ceramic and long fibre reinforced materials, i.e. carbon fibres. This paper makes a distinction for multi-material printing with SMPs, as multi-functionality and exciting applications can be proposed through this method. Manufacturing strategies and technologies for SMPC are addressed in this review and opportunities in the research are highlighted. Findings This paper denotes the existing limitations in the current AM technologies and proposes several directions that will contribute to better use and improvements in the production of additive manufactured SMPC. With advances in AM technologies, gradient changes in material properties can open diverse applications of SMPC. Because of multi-material printing, co-manufacturing sensors to 3D printed smart structures can bring this technology a step closer to obtain full control of the shape memory effect and its characteristics. This paper discusses the novel developments in device and functional part design using SMPC, which should be aided with simple first stage design models followed by complex simulations for iterative and optimized design. A change in paradigm for designing complex structures is still to be made from engineers to exploit the full potential of additive manufactured SMPC structures. Originality/value Advances in AM have opened the gateway to the potential design and fabrication of functional parts with SMPs and their composites. There have been many publications and reviews conducted in this area; yet, many mainly focus on SMPs and reserve a small section to SMPC. This paper presents a comprehensive review directed solely on the AM of SMPC while highlighting the research opportunities.

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Section: Overview Of Shape Memory Polymer Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in additive manufacturing of shape memory polymer composites

Garces

Ayranci

2021

RPJ

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“…The rational design and realization of smart materials are one of the fast-growing fields in materials science and engineering [1][2][3][4][5][6][7][8]. The functional materials with a controllable and intelligent response to external stimuli are of particular appeal and practical import, especially when the responsiveness is inherently incorporated in the materials [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Cellulose membranes as moisture-driven actuators with predetermined deformations and high load uptake

Jiang

Tian

Xuan

et al. 2021

International Journal of Smart and Nano Materials

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We report the synthesis of cellulose membranes from balsa wood with an exceptionally high responsivity to humidity change by chemical processing and mechanical compression. By varying the ambient humidity, the produced cellulose membranes can provide a variety of predetermined deformations, such as curve, s-like deformation and curl. The high humidity responsivity is originated from a self-maintained moisture gradient induced by an asymmetrical design of membrane surfaces, aided by the hygroscopic swelling of the cellulose. The moisture-driven actuators are then demonstrated as a three-finger gripper that can grab, hold and release objects 40 times the weight of its own. The combination of natural wood and stimuli-responsive behavior open a way to designing smart structures, actuators and soft robots with environmentally friendly, recyclable and biocompatible materials.

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“…NiTi shape memory alloys (SMAs) are known as smart engineering materials which exhibit excellent mechanical resistance, in addition to the shape memory effect and superelasticity. [1][2][3] These properties, combined with their biocompatibility, render NiTi to be highly appreciated in biomedical, aerospace, and civil engineering applications. [4][5][6] Nowadays, to further expand the potential applications of NiTi SMAs, it is necessary to develop joining methods with high efficiency and reliability owing to the difficulty in machining these materials.…”

Section: Introductionmentioning

confidence: 99%

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

Zhang

et al. 2020

Materials and Manufacturing Processes

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NiTi thin sheets were ultrasonic spot welded with a Cu interlayer, where different welding vibration amplitudes were applied to study the influence on the surface and interface microstructural characteristics, phase transformation behavior and mechanical response of the joints, which aimed to enhance the joint performance by proper optimization of the process parameters. An excellent bonding interface was achieved when an optimized vibration amplitude was applied, with a recrystallized microstructure formed in the Cu foil side near the bonding interface, which helped to improve the mechanical performance of the joints. Joints made with vibration amplitude of 55 μm had an improved strength compared to the NiTi base material.

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Active composites based on shape memory polymers: overview, fabrication methods, applications, and future prospects

Cited by 77 publications

References 449 publications

Advances in additive manufacturing of shape memory polymer composites

Advances in additive manufacturing of shape memory polymer composites

Cellulose membranes as moisture-driven actuators with predetermined deformations and high load uptake

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

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