Ferroelectric behavior in the high temperature paraelectric phase in a poly(vinylidene fluoride-co-trifluoroethylene) random copolymer

Polymer ◽  
2012 ◽  
Vol 53 (3) ◽  
pp. 728-739 ◽  
Author(s):  
Run Su ◽  
Jung-Kai Tseng ◽  
Mao-Sheng Lu ◽  
Minren Lin ◽  
Qiang Fu ◽  
...  
Keyword(s):  
High Temperature ◽  
Vinylidene Fluoride ◽  
Paraelectric Phase ◽  
Random Copolymer ◽  
Ferroelectric Behavior ◽  
Poly Vinylidene Fluoride

Numerical Study on the Interfacial Modification Effects of Soy Protein on Poly(Vinylidene Fluoride)

2019 ◽  
Author(s):  
Zhuoyuan Zheng ◽  
Chen Xin ◽  
Yumeng Li
Keyword(s):  
High Temperature ◽  
Soy Protein ◽  
Disulfide Bonds ◽  
Vinylidene Fluoride ◽  
Numerical Study ◽  
Protein Molecule ◽  
Heat Denaturation ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Underlying Mechanisms

Abstract The application of bio-degradable green materials is a rising global trend during the past decades for the sake of environment protection and sustainable development. Soy protein-based biomaterial is a promising candidate to replace the petroleum-based synthetic materials and was proved to be an effective functional modifier for polymers from our previous studies. Molecular dynamic (MD) simulation is implemented in this study to provide insights in understanding the underlying mechanisms. 11S molecule is chosen as a representative of soy protein, and three different denaturation processes are applied, including heat denaturation at two temperatures and the breaking of disulfide bonds. It is observed that by controlling the denaturation conditions, the hydrophobicity of the protein molecule is manipulated: high temperature denaturation can increase the exposed area of hydrophilic residues; whereas, by breaking the disulfide bonds, the hydrophobic residues of the molecules can be largely exposed. Besides, the mechanisms of using protein as functional modifier to tune the structures of the hydrophobic Poly(vinylidene fluoride) (PVDF) polymer (amorphous and β-crystal phases) are studied. S-S debond protein is found to favor the formation of amorphous PVDF; whereas, high temperature denatured one has stronger interactions with β phase.

High Temperature Ultrafiltration With Kynar® Poly(Vinylidene Fluoride) Membranes

1980 ◽  
Vol 15 (4) ◽  
pp. 1193-1204 ◽  
Author(s):  
W. D. Benzinger ◽  
B. S. Parekh ◽  
J. L. Eichelberger
Keyword(s):  
High Temperature ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride

Temperature Response of Magnetostrictive/Piezoelectric Polymer Magnetoelectric Laminates

2012 ◽  
Vol 1398 ◽  
Author(s):  
Jon Gutiérrez ◽  
Andoni Lasheras ◽  
Jose Manuel Barandiarán ◽  
Jose Luis Vilas ◽  
María San Sebastián ◽  
...  
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Vinylidene Fluoride ◽  
Temperature Response ◽  
Laminated Composite ◽  
Laminate Composites ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
New Type ◽  
Magnetoelectric Response

ABSTRACTThe temperature effect on the magnetoelectric response of hybrid magnetostrictive/piezoelectric laminated composites in the range from room temperature up to 85 ºC is presented. The samples analyzed consisted of alternating, stacked, layers of a magnetostrictive amorphous metal, and a piezoelectric polymer, bonded to each other with an epoxy. The maximum magnetoelectric effect was observed when the composites were driven at their electromechanical resonance. First, we present results on the fabricability of the laminated composite sensor consisting on Vitrovac 4040® (Fe39Ni39Mo4Si6B12) as the magnetostrictive amorphous component and two different piezoelectric polymers: poly(vinylidene fluoride) (PVDF) and 2,6(β-CN)APB/ODPA (poli 2,6) polyimide, a new type of high temperature piezoelectric polymer. At room temperature induced magnetoelectric voltages of 79.6 and 0.35 V/cm.Oe were measured when using PVDF and poli 2,6 polyimide respectively as the piezoelectric components. When heating, we have observed that the magnetoelectric response of the PVDF-containing device quickly decayed to about 5 V/cm.Oe, while for the poli 2,6- containing one it remained almost constat. We discuss the advantage of using this new piezoelectric polymer due to its good performance at high temperatures, making these magnetoelectric laminate composites suitable for high temperature applications.

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