Polyelectrolyte Complex Fiber of Alginate and Poly(diallyldimethylammonium chloride): Humidity-Induced Shape Memory and Mechanical Transition

2020 ◽  
Vol 2 (6) ◽  
pp. 2119-2125 ◽  
Author(s):  
Wentao Huang ◽  
Jiefu Li ◽  
Dezhong Liu ◽  
Shuaixia Tan ◽  
Pengfei Zhang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyelectrolyte Complex ◽  
Diallyldimethylammonium Chloride ◽  
Mechanical Transition

Tough strained fibers of a polyelectrolyte complex: pretensioned polymers

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46675-46679 ◽  
Author(s):  
Qifeng Wang ◽  
Joseph B. Schlenoff
Keyword(s):  
Shape Memory ◽  
Polyelectrolyte Complex ◽  
Hot Water ◽  
Polyelectrolyte Complexes ◽  
Highly Strained

Polyelectrolyte complexes, long considered “unprocessible”, are transformed from brittle to tough by extrusion into highly strained fibers with a salt/temperature equivalence relaxation and efficient shape memory in hot water.

scholarly journals Two-step polyaniline loading in polyelectrolyte complex membranes for improved pseudo-capacitor electrodes

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 194-199
Author(s):  
Pimchaya Luangaramvej ◽  
Stephan Thierry Dubas
Keyword(s):  
Cyclic Voltammetry ◽  
Polyelectrolyte Complex ◽  
Composite Membranes ◽  
Ammonium Persulfate ◽  
Second Step ◽  
Styrene Sulfonate ◽  
Diallyldimethylammonium Chloride ◽  
Co Precipitation ◽  
Poly Styrene Sulfonate ◽  
Loading Procedure

Abstract A two-step polyaniline (PANI) loading procedure has been developed to produce polyelectrolyte complex composite membranes (CPECs) to be used as supercapacitor electrodes. In the first step, CPECs were prepared by co-precipitation of poly(styrene sulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDADMAC) mixed with various amounts of PANI as a filler. CPECs were formed by compression molding into 100 micron membranes using NaCl as a plasticizer and characterized for their electrochemical properties. In the second step, the highest capacitance CPEC membranes with 60% PANI loading were further modified and doped by crossflow polymerization of aniline through the composite membranes. By using a two-compartment crossflow reactor containing aniline and ammonium persulfate on each side, the PANI content of the composite membrane was further increased. Cyclic voltammetry showed a doubling in the capacitance of the membranes after the crossflow polymerization. The resulting electrodes were flexible with high capacitance and could be used to improve pseudocapacitor performance.

Tensile Failure of 55-Nitinol Wire

1975 ◽  
Vol 33 ◽  
pp. 46-47
Author(s):  
F. I. Grace
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stoichiometric Composition ◽  
Tensile Failure ◽  
Initial State ◽  
Initial Shape ◽  
Nitinol Wire ◽  
Cscl Type ◽  
Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

TEM study of order, structure and defects of β and martensite in Cu-Al-Mn shape memory alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 188-189
Author(s):  
J.M. Guilemany ◽  
F. Peregrin
Keyword(s):  
Shape Memory ◽  
Orthophosphoric Acid ◽  
Isopropyl Alcohol ◽  
Metastable Phase ◽  
Characteristic Temperature ◽  
Ethanol Solution ◽  
Order Structure ◽  
Thin Foils ◽  
Polycrystalline Alloys ◽  
Diamond Saw

The shape memory effect (SME) shown by Cu-Al-Mn alloys stems from the thermoelastic martensitic transformation occuring between a β (L2,) metastable phase and a martensitic phase. The TEM study of both phases in single and polycrystalline Cu-Al-Mn alloys give us greater knowledge of the structure, order and defects.The alloys were obtained by vacuum melting of Cu, Al and Mn and single crystals were obtained from polycrystalline alloys using a modified Bridgman method. Four different alloys were used with (e/a) ranging from 1.41 to 1.46 . Two different heat treatments were used and the alloys also underwent thermal cycling throughout their characteristic temperature range -Ms, Mf, As, Af-. The specimens were cut using a low speed diamond saw and discs were mechanically thinned to 100 μm and then ion milled to perforation at 4 kV. Some thin foils were also prepared by twin-jet electropolishing, using a (1:10:50:50) urea: isopropyl alcohol: orthophosphoric acid: ethanol solution at 20°C. The foils were examinated on a TEM operated at 200 kV.

Atomic Order and Martensitic Transformation in Cu-Al-Be Shape Memory Alloys

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-973-C8-978
Author(s):  
M. Jurado ◽  
Ll. Mañosa ◽  
A. González-Comas ◽  
C. Stassis ◽  
A. Planes
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Atomic Order
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