Poly(ethylene-co-vinyl acetate)/graphene shape-memory actuator with a cyclic thermal/light dual-sensitive capacity

2019 ◽  
Vol 173 ◽  
pp. 41-46 ◽  
Author(s):  
Hui Xie ◽  
Lu Li ◽  
Chuan-Ying Cheng ◽  
Ke-Ke Yang ◽  
Yu-Zhong Wang
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Thermal Light ◽  
Poly Ethylene

Tunable shape memory behaviors of poly(ethylene vinyl acetate) achieved by adding poly(L-lactide)

2015 ◽  
Vol 24 (12) ◽  
pp. 125002 ◽  
Author(s):  
Zhi-xing Zhang ◽  
Fei Liao ◽  
Zhen-zhen He ◽  
Jing-hui Yang ◽  
Ting Huang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Poly Ethylene

Vapor-grown carbon nanofiber/poly(ethylene-co-vinyl acetate) composites with electrical-active two-way shape memory behavior

2017 ◽  
Vol 28 (19) ◽  
pp. 2749-2756 ◽  
Author(s):  
Chen Qian ◽  
Yaofeng Zhu ◽  
Yubing Dong ◽  
Yaqin Fu
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Carbon Nanofibers ◽  
Carbon Nanofiber ◽  
Analytical Techniques ◽  
Heating And Cooling ◽  
The Matrix ◽  
Device Applications ◽  
Poly Ethylene ◽  
Vapor Grown Carbon Nanofiber

Vapor-grown carbon nanofibers were filled into poly(ethylene-co-vinyl acetate) through solution mixing to achieve electrical-active two-way shape memory. The vapor-grown carbon nanofiber/poly(ethylene-co-vinyl acetate) nanocomposites were systematically and explicitly investigated through combined analytical techniques. Experimental results showed an increase in crystallization temperature ( Tc) and a decrease in melting temperature ( Tm) as the vapor-grown carbon nanofiber concentration in the nanocomposites increased. This result indicates that carbon nanofibers can act as nucleating agents during crystallization but may hinder the formation of thermodynamically stable crystals. The nanocomposites had a higher modulus but a lower strength than pure poly(ethylene-co-vinyl acetate). In two-way shape memory testing, a decrease in reversible strain and shape recovery occurred in the nanocomposites. Nevertheless, obvious two-way shape switching was observed in all samples during cyclic heating and cooling. The nanocomposite with 15% vapor-grown carbon nanofibers could be electrically heated rapidly and uniformly because of the high conductivity of vapor-grown carbon nanofibers and their uniform distribution in the matrix. Finally, the electrical-active two-way shape memory effect was achieved. This work contributes to the design of electrical-active two-way shape memory polymers in device applications for advanced functions.

Water-actuated shape-memory and mechanically-adaptive poly(ethylene vinyl acetate) achieved by adding hydrophilic poly (vinyl alcohol)

2018 ◽  
Vol 98 ◽  
pp. 237-245 ◽  
Author(s):  
Zhi-xing Zhang ◽  
Xiao-dong Qi ◽  
Song-tai Li ◽  
Jing-hui Yang ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Ethylene Vinyl Acetate ◽  
Poly Vinyl Alcohol ◽  
Poly Ethylene

Triple-Shape Memory Materials Based on Cross-Linked Poly(ethylene vinyl acetate) and Poly(ε-caprolactone)

2016 ◽  
Vol 55 (47) ◽  
pp. 12232-12241 ◽  
Author(s):  
Zhi-xing Zhang ◽  
Xiao Wei ◽  
Jing-hui Yang ◽  
Nan Zhang ◽  
Ting Huang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Shape Memory Materials ◽  
Triple Shape Memory ◽  
Poly Ethylene

Achieving multimodal locomotion by a crosslinked poly(ethylene-co-vinyl acetate)-based two-way shape memory polymer

2021 ◽  
Author(s):  
Yao Zhao ◽  
Kaiyuan Peng ◽  
Jiaxin Xi ◽  
Shima Shahab ◽  
Reza Mirzaeifar
Keyword(s):  
Shape Memory ◽  
Vinyl Acetate ◽  
Smart Materials ◽  
Shape Memory Polymer ◽  
Soft Actuator ◽  
Output Force ◽  
Poly Ethylene ◽  
Underlying Mechanisms ◽  
Soft Actuators ◽  
Hot Surface

Abstract Locomotion is a critically important topic for soft actuators and robotics, however, the locomotion applications based on two-way shape memory polymers have not been well explored so far. In this work, a crosslinked poly(ethylene-co-vinyl acetate) (cPEVA)-based two-way shape memory polymer is synthesized using dicumyl peroxide (DCP) as the crosslinker. The influence of the DCP concentration on the mechanical properties and the two-way shape memory properties is systematically studied. A Venus flytrap-inspired soft actuator is made by cPEVA, and it is shown that the actuator can efficiently perform gripping movements, indicating that the resultant cPEVA SMP is capable of producing large output force and recovering from large deformations. This polymer is also utilized to make a self-rolling pentagon-shaped device. It is shown that the structure will efficiently roll on a hot surface, proving the applicability of the material in making sophisticated actuators. With introducing an energy barrier, jumping can be accomplished when the stored energy is fast released. Finite element simulations are also conducted to further understand the underlying mechanisms in the complex behavior of actuators based on cPEVA SMP. This work provides critical insights in designing smart materials with external stimulus responsive programmable function for soft actuator applications.

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