scholarly journals The Influence Mechanism of Temperature and Storage Period on Polarization Properties of Poly (Vinylidene Fluoride–Trifluoroethylene) Ultrathin Films

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 301
Author(s):  
Xingjia Li ◽  
Zhi Shi ◽  
Xiuli Zhang ◽  
Xiangjian Meng ◽  
Zhiqiang Huang ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Remanent Polarization ◽  
Vinylidene Fluoride ◽  
Storage Period ◽  
Testing Temperature ◽  
Fatigue Properties ◽  
Inhibition Mechanism ◽  
Poly Vinylidene Fluoride ◽  
High Level ◽  
And Storage

The effect of testing temperature and storage period on the polarization fatigue properties of poly (vinylidene fluoride-trifluoroethylene) (P(VDF–TrFE)) ultrathin film devices were investigated. The experimental results show that, even after stored in air for 150 days, the relative remanent polarization (Pr/Pr(0)) of P(VDF–TrFE) of ultrathin films can keep at a relatively high level of 0.80 at 25 °C and 0.70 at 60 °C. To account for this result, a hydrogen fluoride (HF) formation inhibition mechanism was proposed, which correlated the testing temperature and the storage period with the microstructure of P(VDF–TrFE) molecular chain. Moreover, a theoretical model was constructed to describe the polarization fatigue evolution of P(VDF–TrFE) samples.

Temperature dependence of imprint mechanism in poly(vinylidene fluoride-trifluoroethylene) copolymer ultrathin films

2014 ◽  
Vol 104 (10) ◽  
pp. 103505 ◽  
Author(s):  
Xiuli Zhang ◽  
Xiaoli Du ◽  
Ying Hou ◽  
Zhaoyue Lü ◽  
Haisheng Xu
Keyword(s):  
Temperature Dependence ◽  
Ultrathin Films ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride

Degradation of a Vinylidene Fluoride-Hexafluoropropylene Copolymer in Neutral and Alkaline Aqueous Solutions

1977 ◽  
Vol 50 (1) ◽  
pp. 83-89 ◽  
Author(s):  
C. J. Bryan
Keyword(s):  
Tensile Strength ◽  
Aqueous Solutions ◽  
Storage Tank ◽  
Vinylidene Fluoride ◽  
Careful Examination ◽  
Corrosion Control ◽  
Coolant Water ◽  
Poly Vinylidene Fluoride ◽  
And Storage

Abstract During the preparation for the launch of Skylab I, it was noted that the poly(vinylidene fluoride co hexarluoropropylene) (Viton A®, FKM), bladder in the Apollo telescope mount coolant storage tank was perforated, and coolant water, buffered to a pH of 9.2 for corrosion control, was found in the gas pressurization side of the storage tank. Careful examination of the bladder and storage tank before disassembly revealed that the position of the hole in the bladder did not coincide with any protrusion or irregularity in the tank. After disassembly of the system, the bladder was found to have several cracks in the surface exposed to the coolant water in addition to the previously mentioned hole. Samples of the failed bladder were tested on an Instron, and the tensile strength and elongation were found to have decreased to 48% and 42.5%, respectively, of the values determined by the fabricator at the time of manufacture. In order to better understand the degradation of FKM in neutral and alkaline aqueous solutions, the rate and extent of change in the tensile strength, elongation, and per cent swell of FKM were studied as a function of temperature (50°, 70°, and 90°C), pH (7.0, 9.0, and 11.0), and time of exposure to the test solutions.

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