Transparent, High‐Strength, and Shape Memory Hydrogels from Thermo‐Responsive Amino Acid–Derived Vinyl Polymer Networks

2020 ◽  
Vol 41 (7) ◽  
pp. 1900650 ◽  
Author(s):  
Tomoyuki Koga ◽  
Kotoha Tomimori ◽  
Nobuyuki Higashi
Keyword(s):  
Amino Acid ◽  
Shape Memory ◽  
Polymer Networks ◽  
High Strength ◽  
Vinyl Polymer

scholarly journals Thermally-Induced Shape-Memory Behavior of Degradable Gelatin-Based Networks

2021 ◽  
Vol 22 (11) ◽  
pp. 5892
Author(s):  
Axel T. Neffe ◽  
Candy Löwenberg ◽  
Konstanze K. Julich-Gruner ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Recovery ◽  
Polymer Networks ◽  
Water Soluble ◽  
Compression Tests ◽  
Thermally Induced ◽  
Thermomechanical Process ◽  
Triple Helices

Shape-memory hydrogels (SMH) are multifunctional, actively-moving polymers of interest in biomedicine. In loosely crosslinked polymer networks, gelatin chains may form triple helices, which can act as temporary net points in SMH, depending on the presence of salts. Here, we show programming and initiation of the shape-memory effect of such networks based on a thermomechanical process compatible with the physiological environment. The SMH were synthesized by reaction of glycidylmethacrylated gelatin with oligo(ethylene glycol) (OEG) α,ω-dithiols of varying crosslinker length and amount. Triple helicalization of gelatin chains is shown directly by wide-angle X-ray scattering and indirectly via the mechanical behavior at different temperatures. The ability to form triple helices increased with the molar mass of the crosslinker. Hydrogels had storage moduli of 0.27–23 kPa and Young’s moduli of 215–360 kPa at 4 °C. The hydrogels were hydrolytically degradable, with full degradation to water-soluble products within one week at 37 °C and pH = 7.4. A thermally-induced shape-memory effect is demonstrated in bending as well as in compression tests, in which shape recovery with excellent shape-recovery rates Rr close to 100% were observed. In the future, the material presented here could be applied, e.g., as self-anchoring devices mechanically resembling the extracellular matrix.

scholarly journals Experimental Study and Modeling of the Fatigue Fracture of High-Strength FeMnSi-based Shape Memory Alloy

2020 ◽  
Vol 28 ◽  
pp. 2110-2117
Author(s):  
Fedor S. Belyaev ◽  
Margarita E. Evard ◽  
Eugeny S. Ostropiko ◽  
Aleksandr E. Volkov
Keyword(s):  
Experimental Study ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fatigue Fracture ◽  
High Strength

Martensitic transformations γ-ɛ (α) and the shape-memory effect in aging high-strength manganese austenitic steels

2008 ◽  
Vol 106 (6) ◽  
pp. 630-640 ◽  
Author(s):  
V. V. Sagaradze ◽  
V. I. Voronin ◽  
Yu. I. Filippov ◽  
V. A. Kazantsev ◽  
M. L. Mukhin ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
High Strength ◽  
Martensitic Transformations ◽  
Austenitic Steels

Effects of aging on the shape memory and superelasticity behavior of ultra-high strength Ni 54 Ti 46 alloys under compression

2016 ◽  
Vol 678 ◽  
pp. 93-100 ◽  
Author(s):  
I. Kaya ◽  
H. Tobe ◽  
H.E. Karaca ◽  
B. Basaran ◽  
M. Nagasako ◽  
...  
Keyword(s):  
Shape Memory ◽  
High Strength ◽  
Effects Of Aging

Development of High-Strength, Fine, and Ultrafine-Grained Shape Memory Alloys

2018 ◽  
Vol 119 (13) ◽  
pp. 1346-1349
Author(s):  
V. G. Pushin ◽  
N. N. Kuranova ◽  
A. V. Pushin
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Strength ◽  
Ultrafine Grained

Shape memory behavior of high strength Ni54Ti46 alloys

2013 ◽  
Vol 580 ◽  
pp. 66-70 ◽  
Author(s):  
H.E. Karaca ◽  
I. Kaya ◽  
H. Tobe ◽  
B. Basaran ◽  
M. Nagasako ◽  
...  
Keyword(s):  
Shape Memory ◽  
High Strength ◽  
Shape Memory Behavior

High-Strength Triple Shape Memory Elastomers from Radiation-Vulcanized Polyolefin Elastomer/Polypropylene Blends

2019 ◽  
Vol 1 (7) ◽  
pp. 1735-1748 ◽  
Author(s):  
Aizezi Maimaitiming ◽  
Maojiang Zhang ◽  
Hairong Tan ◽  
Minglei Wang ◽  
Mingxing Zhang ◽  
...  
Keyword(s):  
Shape Memory ◽  
High Strength ◽  
Polyolefin Elastomer ◽  
Triple Shape Memory ◽  
Polypropylene Blends
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