Thermal stability of internal electric field and polarization distribution in blend of polyvinylidene fluoride and polymethylmethacrylate

1993 ◽  
Vol 74 (5) ◽  
pp. 3366-3372 ◽  
Author(s):  
Naoto Tsutsumi ◽  
Yoshiaki Ueda ◽  
Tsuyoshi Kiyotsukuri ◽  
Aimé S. DeReggi ◽  
G. Thomas Davis
Keyword(s):  
Thermal Stability ◽  
Electric Field ◽  
Polyvinylidene Fluoride ◽  
Internal Electric Field ◽  
Polarization Distribution ◽  
Thermal Stability Of

scholarly journals Influence of dopant on the specific features of formation and properties of nanocomposites of poly(3-methylthiophene) with polyvinylidene fluoride

2021 ◽  
pp. 159-174
Author(s):  
Alexander A. Pud ◽  
◽  
Nikolay A. Ogurtsov ◽  
Olga S. Kruglyak ◽  
◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Thermal Studies ◽  
Shell Morphology ◽  
Inhomogeneous Layer ◽  
Transmission Electron ◽  
Oxidant Concentration ◽  
Poly Vinylidene Fluoride ◽  
Thermal Stability Of

The work is devoted to the development and study of conducting nanocomposites of poly(3-methylthiophene) (P3MT) and poly(vinylidene fluoride) (PVDF), suitable for changing properties when interaction with of the environment components, and to find factors of influence on properties of such materials. The kinetic aspects of P3MT formation in the process of 3-methylthiophene (3MT) polymerization in PVDF dispersions in the presence of dopants of different nature, in particular, chloride (Cl-), as well as surface-active dodecylbenzenesulfonate (DBS-) and perfluorooctanoate (PFO-) anions are studied. It is found that DBS- and PFO- anions inhibit 3MT oxidation and decrease P3MT yield in comparison with those of chloride anions. It is shown that P3MT is formed through two consecutive kinetically different reactions of pseudo-first order in terms of the oxidant concentration. Transmission electron microscopy revealed that as a result of such polymerization nanoparticles of doped P3MT formed a surface inhomogeneous layer on PVDF particles, thus forming nanocomposite particles with core-shell morphology. Thermal studies showed higher thermal stability of the doped P3MT phase in the nanocomposite compared to the pure polymer. It is found that thermal stability of the P3MT phase in the PVDF/P3MT-DBS nanocomposites is higher than in the PVDF/P3MT-Cl. The influence of the dopant nature and content of doped P3MT on conductivity and sensitivity of the nanocomposites to vapors of harmful volatile organic compounds (acetone and isopropanol) is characterized. The strongest responses to acetone are shown by the nanocomposite with PFO- dopant. In the DBS- dopant case medium intensity responses are found and the lowest ones are observed for Cl- dopant. It is shown that the sensitivity of nanocomposites extremely depends on the conducting polymer content.

Heartbeat Monitoring Technique Based on Corona-Poled PVDF Film Sensor for Smart Apparel Application

2007 ◽  
Vol 124-126 ◽  
pp. 299-302 ◽  
Author(s):  
You Min Chang ◽  
Jong Soon Lee ◽  
Kap Jin Kim
Keyword(s):  
Electric Field ◽  
Polyvinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Computer Applications ◽  
Polymer Materials ◽  
Pvdf Film ◽  
Internal Electric Field ◽  
Film Sensor ◽  
Β Phase ◽  
Voltage Amplifier

Flexible piezoelectric polymer materials for smart apparel and wearable computer applications are of great interest. Among known ferroelectric and piezoelectric polymers, polyvinylidene fluoride (PVDF) exhibit β-phase under poling and is known to give highest piezo-, pyro-, and ferroelectric properties. Previous reports suggests that, during corona poling of the PVDF film, a high surface electric potential is generated resulting in a high internal electric field within the polymer film causing the polarization of the dipoles along the direction of the applied electric field. The resultant phase change from α- to β-phase and the dipole switching generates displacement of charges or piezoelectricity. And also mechanical variation would change dipole density of PVDF film. In this report, we measured human heartbeat signal from an DAQ interfaced with a custommade voltage-amplifier with specific frequency filtering function using the corona-poled PVDF film of various sizes and thickness as a piezoelectric sensor and analyzed it. We employed elastic textile band to sensor system for comfortable fit on wrist or ankle. And then, we found the feasibility of applying flexible PVDF film sensor to smart apparel application which can sense heartbeat rate, blood pressure, respiration rate, accidental external impact on human body, etc.

Thermal stability of NO on Ga-doped graphene and effect of external electric field

2018 ◽  
Vol 151 ◽  
pp. 214-221 ◽  
Author(s):  
Xiongyi Liang ◽  
Siu-Pang Ng ◽  
Ning Ding ◽  
Chi-Man Lawrence Wu
Keyword(s):  
Thermal Stability ◽  
Electric Field ◽  
External Electric Field ◽  
Doped Graphene ◽  
Thermal Stability Of

scholarly journals Exploring ultrafast threshold switching in In3SbTe2 phase change memory devices

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Nishant Saxena ◽  
Christoph Persch ◽  
Matthias Wuttig ◽  
Anbarasu Manivannan
Keyword(s):  
Thermal Stability ◽  
Electric Field ◽  
Phase Change ◽  
High Speed ◽  
Phase Change Materials ◽  
Phase Change Memory ◽  
Threshold Switching ◽  
Experimental Findings ◽  
Thermal Stability Of ◽  
Change Memory

AbstractPhase change memory (PCM) offers remarkable features such as high-speed and non-volatility for universal memory. Yet, simultaneously achieving better thermal stability and fast switching remains a key challenge. Thus, exploring novel materials with improved characteristics is of utmost importance. We report here, a unique property-portfolio of high thermal stability and picosecond threshold switching characteristics in In3SbTe2 (IST) PCM devices. Our experimental findings reveal an improved thermal stability of amorphous IST compared to most other phase change materials. Furthermore, voltage dependent threshold switching and current-voltage characteristics corroborate an extremely fast, yet low electric field threshold switching operation within an exceptionally small delay time of less than 50 picoseconds. The combination of low electric field and high speed switching with improved thermal stability of IST makes the material attractive for next-generation high-speed, non-volatile memory applications.

Method of evaluating the thermal stability of the pyroelectric properties of polyvinylidene fluoride: Effects of poling temperature and field

1982 ◽  
Vol 53 (10) ◽  
pp. 6520-6525 ◽  
Author(s):  
Danilo DeRossi ◽  
Aime S. DeReggi ◽  
Martin G. Broadhurst ◽  
Steven C. Roth ◽  
G. Thomas Davis
Keyword(s):  
Thermal Stability ◽  
Polyvinylidene Fluoride ◽  
Pyroelectric Properties ◽  
Poling Temperature ◽  
Thermal Stability Of

Magnetic properties and thermal stability of polyvinylidene fluoride—Fe2O3 nanocomposites

2020 ◽  
Vol 35 (2) ◽  
pp. 132-140 ◽  
Author(s):  
Victor Kuncser ◽  
Dorina Chipara ◽  
Karen S. Martirosyan ◽  
Gabriel Alexandru Schinteie ◽  
Elamin Ibrahim ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Polyvinylidene Fluoride ◽  
Image Position ◽  
Thermal Stability Of

Abstract

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