scholarly journals Origami hand for soft robotics driven by thermally controlled polymeric fiber actuators

2021 ◽  
Author(s):  
Muhammad Farhan ◽  
Marc Behl ◽  
Karl Kratz ◽  
Andreas Lendlein
Keyword(s):  
Vinyl Acetate ◽  
Elastic Recovery ◽  
Work Capacity ◽  
Soft Robotics ◽  
Artificial Muscles ◽  
Smart Textiles ◽  
Single Fibers ◽  
Poly Ethylene ◽  
Polymeric Fiber

AbstractActive fibers can serve as artificial muscles in robotics or components of smart textiles. Here, we present an origami hand robot, where single fibers control the reversible movement of the fingers. A recovery/contracting force of 0.2 N with a work capacity of 0.175 kJ kg−1 was observed in crosslinked poly[ethylene-co-(vinyl acetate)] (cPEVA) fibers, which could enable the bending movement of the fingers by contraction upon heating. The reversible opening of the fingers was attributed to a combination of elastic recovery force of the origami structure and crystallization-induced elongation of the fibers upon cooling. Graphic abstract

Contribution to the determination of relative increment of internal energy at low deformation of cross-linked rubber

1980 ◽  
Vol 45 (8) ◽  
pp. 2315-2318 ◽  
Author(s):  
Vladimír Pollák ◽  
Andrej Romanov
Keyword(s):  
Internal Energy ◽  
Vinyl Acetate ◽  
Temperature Changes ◽  
Relative Increment ◽  
Poly Ethylene ◽  
Small Deformations

The relative charge of the internal energy, fU/f, during deformation of cross-linked elastomers, poly(ethylene-co-propylene) and poly(ethylene-co-vinyl acetate), was determined at various temperatures. Anomalies in the dependence of fU/f on relative dilatation in the region of small deformations ( 35%) are to a large extent besides other factors due to the sensibility of the formula used to calculate fU/f to temperature changes.

Uniformly aligned liquid crystal molecules on reformed poly(ethylene-co-vinyl acetate) layers driven by ion beam exposure

2021 ◽  
pp. 1-10
Author(s):  
Dong Wook Lee ◽  
Eun Mi Kim ◽  
Gi Seok Heo ◽  
Ju Hwan Lee ◽  
Dong Hyun Kim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Vinyl Acetate ◽  
Ion Beam ◽  
Poly Ethylene

Preparation of Well-Exfoliated Poly(ethylene-co-vinyl acetate)/α-Zirconium Phosphate Nanocomposites

Langmuir ◽  
2021 ◽  
Author(s):  
Mingzhen Zhao ◽  
Joseph Baker ◽  
Zhiyuan Jiang ◽  
Zewen Zhu ◽  
Hong-Mao Wu ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Zirconium Phosphate ◽  
Poly Ethylene

Athermal Artificial Muscles with Drastically Improved Work Capacity from pH-Responsive Coiled Polymer Fibers

2021 ◽  
pp. 129703
Author(s):  
Sevketcan Sarikaya ◽  
Frank Gardea ◽  
Jeffrey T. Auletta ◽  
Jamshid Kavosi ◽  
Alex Langrock ◽  
...  
Keyword(s):  
Work Capacity ◽  
Polymer Fibers ◽  
Artificial Muscles ◽  
Ph Responsive

The modification of bitumen with styrene–butadiene–styrene, ethylene vinyl acetate and varying the amount of reactive ethylene terpolymer

2017 ◽  
Vol 50 (3) ◽  
pp. 241-255 ◽  
Author(s):  
Seyfullah Keyf
Keyword(s):  
Vinyl Acetate ◽  
Softening Point ◽  
Elastic Recovery ◽  
Ethylene Vinyl Acetate ◽  
Modified Bitumen ◽  
Penetration Index ◽  
Different Types ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

In this article, 50/70 penetration grade TUPRAS bitumen was modified. Reactive elastomeric terpolymer (Elvaloy RET; DuPont Company), ethylene vinyl acetate (EVA) and styrene–butadiene–styrene (SBS) polymers were used in bitumen modification. Set hours of the tests were applied to samples taken from the obtained modified bitumen mixture. Varying amount of reactive ethylene terpolymer with weight ratios of 0.5%, 1.0%, 1.5%, 2.0% and 2.5% were introduced to the mixture of raw bitumen with 1.0% SBS and 1.0% EVA. Penetration, penetration index, softening point, ductility and elastic recovery tests were performed with these modified bitumen and raw bitumen. The samples of raw bitumen and modified bitumens of 2.0% Elvaloy RET, 1.0% SBS and 1.0% EVA were investigated by means of IR spectroscopy. The raw bitumen was modified with SBS, EVA and RET, and it was determined that penetration and ductility values were decreased while penetration index, softening point and elastic recovery were increased. The purpose of this study is to research the improving properties of 50/70 penetration grade–modified bitumen used in highways of Turkey. The most important characteristics (such as softening point, penetration and % elastic recovery) of new polymer-modified bitumen (NPMB) containing 2.5% EVA, 1% RET and 1% SBS were compared with eight different types of polymer-modified bitumens in Turkey (TPMB). NPMB provided all required parameters (softening point, penetration and % elastic recovery) for five different types of TPMBs (TPMB 70-16, TPMB 70-22, TPMB 76-16, TPMB 76-22 and TPMB 82-16).

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