The Experts below are selected from a list of 2916 Experts worldwide ranked by ideXlab platform

Fangxiao Guan - One of the best experts on this subject based on the ideXlab platform.

  • crystal orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
    Macromolecules, 2013
    Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao Guan
    Abstract:

    Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the crystal orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, crystal orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented Films upon increasing the extension ratio. For a fully Stretched Film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...

  • crystal orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
    Macromolecules, 2013
    Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao Guan
    Abstract:

    Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the crystal orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, crystal orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented Films upon increasing the extension ratio. For a fully Stretched Film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...

Wenping Hu - One of the best experts on this subject based on the ideXlab platform.

  • Solar Thermal Storage and Room-Temperature Fast Release Using a Uniform Flexible Azobenzene-Grafted Polynorborene Film Enhanced by Stretching
    Macromolecules, 2019
    Co-Authors: Linxia Fu, Jixing Yang, Liqi Dong, Huitao Yu, Fei Zhai, Yunhua Xu, Yanfeng Dang, Fulai Zhao, Wenping Hu
    Abstract:

    Deformation-controlled solar thermal storage and release are important for thermal management of dynamic systems. However, few researchers have examined cyclic solid-state solar thermal utilization with different deformations. A uniform flexible stretchable solar thermal fuel Film is presented using polynorbornene-templated azobenzene (PNB-Azo) with ring-opening metathesis polymerization and covalent grafting. This Film has a high degree of isomerization and good storage stability compared to push–pull electronic interaction. At 20% strain rate, the Film combines high-degree photocharging (85%), high energy density (49.0 Wh kg–1), and high rate of heat release induced by blue light (475 nm) at room temperature. Greater free volume improves isomerization and the first-order kinetic constant is increased by 1 order of magnitude. Reversible electric-driven dynamic stretching during charging and discharging enables PNB-Azo“fingers” to release heat more rapidly than static Stretched Film, resulting in a temper...

Lianyun Yang - One of the best experts on this subject based on the ideXlab platform.

  • crystal orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
    Macromolecules, 2013
    Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao Guan
    Abstract:

    Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the crystal orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, crystal orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented Films upon increasing the extension ratio. For a fully Stretched Film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...

  • crystal orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
    Macromolecules, 2013
    Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao Guan
    Abstract:

    Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the crystal orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, crystal orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented Films upon increasing the extension ratio. For a fully Stretched Film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...

Ichiro Ishizuka - One of the best experts on this subject based on the ideXlab platform.

  • Development and industrialization of a biaxially Stretched nano-alloyed Film
    Polymer Journal, 2012
    Co-Authors: Tetsuya Tsunekawa, Takuji Higashioji, Hirofumi Hosokawa, Akira Kubota, Ichiro Ishizuka
    Abstract:

    We have proposed the concept and significance of nano-alloyed polymer, which includes nano-dispersed domains, and have developed the biaxially Stretched Film with higher glass transition temperature and improved dimensional stability as compared with regular poly(ethylene terephthalate) Film (Figures 1 and 2). Highly concentrated polyimide master batches are made at much lower temperature compared with regular processing temperature. The nano-alloyed Film is obtained by Film-making process having biaxial stretching and heat treatment. The nano-sized domains have an important role as pseudo-cross-linkage points, for demonstrating good drawing process ability and high orientation. The novel concept and significance of a nano-alloyed polymer, which includes nano-dispersed domains, is proposed, and a biaxially Stretched nano-alloyed Film is developed. The developed Film has a higher glass transition temperature and improved dimensional stability compared with regular poly(ethylene terephthalate) (PET) Films. Nano-sized polyimide domains are dispersed with our original melting extrusion process, which produces highly concentrated polyimide master batches at much lower temperatures than the regular processing temperature of the polyimide. The biaxially Stretched Film has been industrialized for use as a substrate for data storage tapes and can additionally be applied to materials in the fields of electronic devices, automobile, environmental and energy devices.

  • Development and industrialization of a biaxially Stretched nano-alloyed Film
    Polymer Journal, 2012
    Co-Authors: Tetsuya Tsunekawa, Takuji Higashioji, Hirofumi Hosokawa, Akira Kubota, Ichiro Ishizuka
    Abstract:

    We have proposed the concept and significance of nano-alloyed polymer, which includes nano-dispersed domains, and have developed the biaxially Stretched Film with higher glass transition temperature and improved dimensional stability as compared with regular poly(ethylene terephthalate) Film (Figures 1 and 2). Highly concentrated polyimide master batches are made at much lower temperature compared with regular processing temperature. The nano-alloyed Film is obtained by Film-making process having biaxial stretching and heat treatment. The nano-sized domains have an important role as pseudo-cross-linkage points, for demonstrating good drawing process ability and high orientation. The novel concept and significance of a nano-alloyed polymer, which includes nano-dispersed domains, is proposed, and a biaxially Stretched nano-alloyed Film is developed. The developed Film has a higher glass transition temperature and improved dimensional stability compared with regular poly(ethylene terephthalate) (PET) Films. Nano-sized polyimide domains are dispersed with our original melting extrusion process, which produces highly concentrated polyimide master batches at much lower temperatures than the regular processing temperature of the polyimide. The biaxially Stretched Film has been industrialized for use as a substrate for data storage tapes and can additionally be applied to materials in the fields of electronic devices, automobile, environmental and energy devices.

Yanfeng Dang - One of the best experts on this subject based on the ideXlab platform.

  • Solar Thermal Storage and Room-Temperature Fast Release Using a Uniform Flexible Azobenzene-Grafted Polynorborene Film Enhanced by Stretching
    Macromolecules, 2019
    Co-Authors: Linxia Fu, Jixing Yang, Liqi Dong, Huitao Yu, Fei Zhai, Yunhua Xu, Yanfeng Dang, Fulai Zhao, Wenping Hu
    Abstract:

    Deformation-controlled solar thermal storage and release are important for thermal management of dynamic systems. However, few researchers have examined cyclic solid-state solar thermal utilization with different deformations. A uniform flexible stretchable solar thermal fuel Film is presented using polynorbornene-templated azobenzene (PNB-Azo) with ring-opening metathesis polymerization and covalent grafting. This Film has a high degree of isomerization and good storage stability compared to push–pull electronic interaction. At 20% strain rate, the Film combines high-degree photocharging (85%), high energy density (49.0 Wh kg–1), and high rate of heat release induced by blue light (475 nm) at room temperature. Greater free volume improves isomerization and the first-order kinetic constant is increased by 1 order of magnitude. Reversible electric-driven dynamic stretching during charging and discharging enables PNB-Azo“fingers” to release heat more rapidly than static Stretched Film, resulting in a temper...

  • Solar Thermal Storage and Room-Temperature Fast Release Using a Uniform Flexible Azobenzene-Grafted Polynorborene Film Enhanced by Stretching
    2019
    Co-Authors: Jixing Yang, Liqi Dong, Fei Zhai, Fulai Zhao, Qinghai Yan, Yanfeng Dang
    Abstract:

    Deformation-controlled solar thermal storage and release are important for thermal management of dynamic systems. However, few researchers have examined cyclic solid-state solar thermal utilization with different deformations. A uniform flexible stretchable solar thermal fuel Film is presented using polynorbornene-templated azobenzene (PNB-Azo) with ring-opening metathesis polymerization and covalent grafting. This Film has a high degree of isomerization and good storage stability compared to push–pull electronic interaction. At 20% strain rate, the Film combines high-degree photocharging (85%), high energy density (49.0 Wh kg–1), and high rate of heat release induced by blue light (475 nm) at room temperature. Greater free volume improves isomerization and the first-order kinetic constant is increased by 1 order of magnitude. Reversible electric-driven dynamic stretching during charging and discharging enables PNB-Azo“fingers” to release heat more rapidly than static Stretched Film, resulting in a temperature increase of 1.5 °C. The result indicates that PNB-AzoFilm can be used as a high-power dynamic solar heat source by controlling the deformation