Dielectric relaxation behavior and its relation to microstructure in relaxor ferroelectric polymers: High-energy electron irradiated poly(vinylidene fluoride–trifluoroethylene) copolymers

2002 ◽  
Vol 92 (11) ◽  
pp. 6749-6755 ◽  
Author(s):  
Z.-Y. Cheng ◽  
Q. M. Zhang ◽  
Fred B. Bateman
Keyword(s):  
Dielectric Relaxation ◽  
Vinylidene Fluoride ◽  
High Energy ◽  
Relaxor Ferroelectric ◽  
Relaxation Behavior ◽  
Energy Electron ◽  
High Energy Electron ◽  
Ferroelectric Polymers ◽  
Poly Vinylidene Fluoride ◽  
Dielectric Relaxation Behavior

Effect of High-Energy-Electron Irradiation on Nonisothermal Crystallization Kinetics in P(VDF-TrFE) 65/35 mol% Copolymers

2005 ◽  
Vol 889 ◽  
Author(s):  
Zhi-Min Li ◽  
Z.-Y. Cheng
Keyword(s):  
Electron Irradiation ◽  
Crystallization Temperature ◽  
Vinylidene Fluoride ◽  
High Energy ◽  
Energy Electron ◽  
Three Dimensions ◽  
High Energy Electron ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Poly Vinylidene Fluoride

ABSTRACTThe effect of the high-energy-electron irradiation on the crystallization process in poly(vinylidene fluoride-trifluoroethyelene) [(P(VDF-TrFE)] 65/35 mol% copolymers was studied by nonisothermal crystallization using the differential scanning calorimetry (DSC) technique. The experimental data are analyzed using modified Avrami, Ozawa, and combined Avrami-Ozawa methods. It is found that the crystals grow in three dimensions in the irradiated samples. It is found that the irradiation results in a lower crystallization temperature and a lower crystallization activation energy. It is also found that the irradiated samples have a lower crystallization temperature than the unirradiated samples. All these results indicate that the crystals grown in the irradiated samples have a smaller surface energy, which corresponds to a thicker interfacial layer.

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