Fangxiao Guan
University of Connecticut
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Publication
Featured researches published by Fangxiao Guan.
Applied Physics Letters | 2009
Fangxiao Guan; Zhongzhe Yuan; Essay Wen Shu; Lei Zhu
Although a high electric energy density was recently reported for defect-modified poly(vinylidene fluoride) (PVDF) copolymers at millisecond discharge, they usually deliver less energy at a high pulse rate. In this letter, a low loss polystyrene (PS) was grafted as side chains onto the P(VDF-chlorotrifluoroethylene) main chain. After PVDF crystallization, dielectric PS side chains were segregated to the crystalline-amorphous interface, forming a finite confinement layer for ferroelectric PVDF crystals. We speculated that less space charge was induced during electric poling because of the nanoscale confinement effect. Consequently, a fast discharge speed and a relatively high energy density were achieved.
IEEE Transactions on Dielectrics and Electrical Insulation | 2011
Fangxiao Guan; Jing Wang; Lei Zhu; Jilin Pan; Qing Wang
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.
Macromolecules | 2007
Yi Liu; Li Cui; Fangxiao Guan; Yi Gao; Nyle E. Hedin; Lei Zhu; Hao Fong
Macromolecules | 2010
Fangxiao Guan; Jilin Pan; Jing Wang; Qing Wang; Lei Zhu
Macromolecules | 2010
Fangxiao Guan; Jing Wang; Jilin Pan; Qing Wang; Lei Zhu
Advanced Functional Materials | 2011
Fangxiao Guan; Lianyun Yang; Jing Wang; Bing Guan; Kuo Han; Qing Wang; Lei Zhu
Macromolecules | 2011
Fangxiao Guan; Jing Wang; Lianyun Yang; Jung-Kai Tseng; Kuo Han; Qing Wang; Lei Zhu
Macromolecules | 2013
Lianyun Yang; Elshad Allahyarov; Fangxiao Guan; Lei Zhu
Journal of Polymer Science Part B | 2014
Jing Wang; Fangxiao Guan; Li Cui; Jilin Pan; Qing Wang; Lei Zhu
Chinese Journal of Polymer Science | 2011
Fangxiao Guan; Jing Wang; Jilin Pan; Qing Wang; Lei Zhu