Reinforcement of shape-memory poly(ethylene-co-vinyl acetate) by carbon fibre to access robust recovery capability under resistant condition

Xie, Hui; Li, Lü; Deng, Xiaoying; Cheng, Chuan-Ying; Yang, Ke‐Ke; Wang, Yu‐Zhong

doi:10.1016/j.compscitech.2018.01.031

Cited by 50 publications

(21 citation statements)

References 34 publications

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“…This observation was caused by the increase in crosslink density, which impedes the movement of the molecular chain and crystal growth. Meanwhile, the self-adjustment ability and chain mobility of the chain segments decreased due to the crosslinked network and then restrict the growth of EVA crystals [40,44]. Owing to good orientation in the drafting process, the mechanical properties of EVA fiber have been remarkably enhanced.…”

Section: Resultsmentioning

confidence: 99%

“…Considering the molecular structure of 2W-SMPs, the premise of fiber with 2W-SME is that the fibers must have crosslinked network. Commercial semi-crystalline polymers such as polyethylene, polypropylene, poly(ε-caprolactone), and ethylene-vinyl acetate copolymer (EVA) have been widely used to design 2W-SMPs due to their low cost and ease of processing [39,40,41,42,43,44]. Our previous research indicated that EVA with crystallization and crosslinked structure exhibited melting induced contraction (MIC) and crystallization induced elongation (CIE) under constant stress and stress-free conditions [42,45].…”

Section: Introductionmentioning

confidence: 99%

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Design of Ethylene-Vinyl Acetate Copolymer Fiber with Two-Way Shape Memory Effect

Yang

Wang

et al. 2019

Polymers

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One-dimensional shape memory polymer fibers (SMPFs) have obvious advantages in mechanical properties, dispersion properties, and weavability. In this work, a method for fabricating semi-crystallization ethylene-vinyl acetate copolymer (EVA) fiber with two-way shape memory effect by melt spinning and ultraviolet (UV) curing was developed. Here, the effect of crosslink density on its performance was systematically analyzed by gel fraction measurement, tensile tests, DSC, and TMA analysis. The results showed that the crosslink density and shape memory properties of EVA fiber could be facilely adjusted by controlling UV curing time. The resulting EVA fiber with cylindrical structure had a diameter of 261.86 ± 13.07 μm, and its mechanical strength and elongation at break were 64.46 MPa and 114.33%, respectively. The critical impact of the crosslink density and applied constant stress on the two-way shape memory effect were analyzed. Moreover, the single EVA fiber could lift more than 143 times its own weight and achieve 9% reversible actuation strain. The reversible actuation capability was significantly enhanced by a simple winding design of the single EVA fiber, which provided great potential applications in smart textiles, flexible actuators, and artificial muscles.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Ethylene-Vinyl Acetate Copolymer Fiber with Two-Way Shape Memory Effect

Yang

Wang

et al. 2019

Polymers

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“…Along with the high cycle life (based on self-healing behavior), it could also lift a mass 500 times its weight within 5 s and the maximum power density registered was half of the mammalian skeletal muscles ( Figure 5 b). Moreover, Xie et al [ 89 ] introduced poly (ethylene-co-vinyl acetate)/graphene (cEVA/G) shape-memory actuators. They developed a series of EVA-carbon fiber based composites (EVA/CF) with a remarkably enhanced recovery stress both in a free state and under compressive stress.…”

Section: Applications Of Shape-memory Polymeric Artificial Musclesmentioning

confidence: 99%

“…Copyright (2018) John Wiley and Sons); ( b ) the actuation and grasping behavior of the PUPCL-DS copolymer (Reprinted from Materials and Design [ 88 ]. Copyright (2019) Elsevier); ( c ) the deployable device structure made up of cEVA/CF composites shape recovery behavior (Reprinted (adapted) with permission [ 89 ]. Copyright (2018) Elsevier).…”

Section: Figurementioning

confidence: 99%

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

Chen

Rehman

et al. 2020

Molecules

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Shape-memory materials are smart materials that can remember an original shape and return to their unique state from a deformed secondary shape in the presence of an appropriate stimulus. This property allows these materials to be used as shape-memory artificial muscles, which form a subclass of artificial muscles. The shape-memory artificial muscles are fabricated from shape-memory polymers (SMPs) by twist insertion, shape fixation via Tm or Tg, or by liquid crystal elastomers (LCEs). The prepared SMP artificial muscles can be used in a wide range of applications, from biomimetic and soft robotics to actuators, because they can be operated without sophisticated linkage design and can achieve complex final shapes. Recently, significant achievements have been made in fabrication, modelling, and manipulation of SMP-based artificial muscles. This paper presents a review of the recent progress in shape-memory polymer-based artificial muscles. Here we focus on the mechanisms of SMPs, applications of SMPs as artificial muscles, and the challenges they face concerning actuation. While shape-memory behavior has been demonstrated in several stimulated environments, our focus is on thermal-, photo-, and electrical-actuated SMP artificial muscles.

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“…Considering the molecular structure of 2W-SMPs, the premise of fiber with 2W-SME is that the fibers must have crosslinked network. Commercial semi-crystalline polymers such as polyethylene, polypropylene, poly(ε-caprolactone) and ethylene-vinyl acetate copolymer (EVA) have been widely used to design 2W-SMPs due to their low cost and ease of processing [39][40][41][42][43][44]. Our previous research indicated that EVA with crystallization and crosslinked structure exhibited melting induced contraction (MIC) and crystallization induced elongation (CIE) under constant stress and stress-free condition [42,45].…”

Section: Introductionmentioning

confidence: 99%

Design of ethylene-vinyl acetate copolymer fiber with two-way shape memory effect

Yang

Wang

et al. 2019

Preprint

View full text Add to dashboard Cite

One-dimensional shape memory polymer fibers (SMPFs) have obvious advantages in mechanical properties, dispersion properties and weavability. In this work, a method for fabricating semi-crystallization ethylene-vinyl acetate copolymer (EVA) fiber with two-way shape memory effect by melt spinning and ultraviolet (UV) curing was developed. Here, the effect of crosslink density on its performance was systematically analyzed by gel fraction measurement, tensile tests, DSC and TMA analysis. The results showed that the crosslink density and shape memory properties of EVA fiber could be facilely adjusted by controlling UV curing time. The resulting EVA fiber with cylindrical structure had a diameter of 247.13 ± 10.07 μm, and its mechanical strength and elongation at break were 64.46 MPa and 114.33%, respectively. The critical impact of the crosslink density and applied constant stress on the two-way shape memory effect were analyzed. Moreover, the single EVA fiber could lift more than 143 times its own weight and achieve 9% reversible actuation strain. The reversible actuation capability was significantly enhanced by a simple winding design of the single EVA fiber, which provided great potential applications in smart textiles, flexible actuators and artificial muscles.

show abstract

Reinforcement of shape-memory poly(ethylene-co-vinyl acetate) by carbon fibre to access robust recovery capability under resistant condition

Cited by 50 publications

References 34 publications

Design of Ethylene-Vinyl Acetate Copolymer Fiber with Two-Way Shape Memory Effect

Design of Ethylene-Vinyl Acetate Copolymer Fiber with Two-Way Shape Memory Effect

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

Design of ethylene-vinyl acetate copolymer fiber with two-way shape memory effect

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