TY - JOUR
T1 - Effects of film processing conditions on electric energy storage for pulsed power applications
AU - Guan, Fangxiao
AU - Wang, Jing
AU - Zhu, Lei
AU - Pan, Jilin
AU - Wang, Qing
N1 - Funding Information:
He is the recipient of NSF Career Award, Rustum and Della Roy Innovation in Materials Research Award, and Virginia S. and Philip L.
Funding Information:
The authors are indebted to Prof. Steven Boggs at University of Connecticut and Prof. Jerome Lando at Case Western Reserve University for helpful discussion. This work is supported by ONR (N00014-05-1-0338) and NSF DMR-0907580.
PY - 2011/8
Y1 - 2011/8
N2 - Processing conditions have significant influence on the crystalline morphology in poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] copolymer films and in turn determine the electric energy storage in the final products. The electric energy storage and discharge behaviors in these P(VDF-HFP) films obtained from different processing conditions were studied by electric displacement (D) - electric field (E) loop measurements. Under the same mechanical stretching conditions in terms of stretching ratio and stretching rate, more α-crystals could be transformed into β-crystals when stretching at a lower temperature than at a higher temperature. As a result, strong coupling interactions among ferroelectric domains were induced in the films stretched at low temperatures due to a high β-crystal content. The strong coupling interactions facilitated the dipole switching behavior under the forward poling field and prevented the oriented dipoles from switching to the random (or antiferroelectric-like) state upon the reverse poling. Therefore, more electric energy was stored but less was discharged for films with a high β-crystal content. If the crystalline morphology with a high β-crystal content can be further modified to help the discharge process, a polymer capacitor film with high energy densities can be achieved.
AB - Processing conditions have significant influence on the crystalline morphology in poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] copolymer films and in turn determine the electric energy storage in the final products. The electric energy storage and discharge behaviors in these P(VDF-HFP) films obtained from different processing conditions were studied by electric displacement (D) - electric field (E) loop measurements. Under the same mechanical stretching conditions in terms of stretching ratio and stretching rate, more α-crystals could be transformed into β-crystals when stretching at a lower temperature than at a higher temperature. As a result, strong coupling interactions among ferroelectric domains were induced in the films stretched at low temperatures due to a high β-crystal content. The strong coupling interactions facilitated the dipole switching behavior under the forward poling field and prevented the oriented dipoles from switching to the random (or antiferroelectric-like) state upon the reverse poling. Therefore, more electric energy was stored but less was discharged for films with a high β-crystal content. If the crystalline morphology with a high β-crystal content can be further modified to help the discharge process, a polymer capacitor film with high energy densities can be achieved.
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U2 - 10.1109/TDEI.2011.5976130
DO - 10.1109/TDEI.2011.5976130
M3 - Article
AN - SCOPUS:80051734694
SN - 1070-9878
VL - 18
SP - 1293
EP - 1300
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
IS - 4
M1 - 5976130
ER -