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

Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Polymers 2019, 11(10), 1599; https://doi.org/10.3390/polym11101599
Received: 23 August 2019 / Revised: 17 September 2019 / Accepted: 27 September 2019 / Published: 30 September 2019
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. View Full-Text
Keywords: shape memory polymer fiber; two-way shape memory effect; melt spinning; UV curing shape memory polymer fiber; two-way shape memory effect; melt spinning; UV curing
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MDPI and ACS Style

Qi, X.; Yang, W.; Yu, L.; Wang, W.; Lu, H.; Wu, Y.; Zhu, S.; Zhu, Y.; Liu, X.; Dong, Y.; Fu, Y. Design of Ethylene-Vinyl Acetate Copolymer Fiber with Two-Way Shape Memory Effect. Polymers 2019, 11, 1599.

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