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High dielectric permittivity and percolative behavior of polyvinyl alcohol/potassium dihydrogen phosphate composites
Author(s) -
Uddin Md Jamal,
Sannigrahi J.,
Masud Md G.,
Bhadra D.,
Chaudhuri B. K.
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36483
Subject(s) - materials science , dielectric , polyvinyl alcohol , composite material , permittivity , dielectric loss , composite number , relative permittivity , percolation threshold , percolation (cognitive psychology) , anhydrous , polymer , casting , organic chemistry , chemistry , electrical resistivity and conductivity , electrical engineering , optoelectronics , engineering , neuroscience , biology
A new kind of anhydrous, transparent, and flexible potassium dihydrogen phosphate (KH 2 PO 4 or KDP)/polyvinyl alcohol (PVA) composite in the form of film (0.10 mm) has been prepared by solution casting technique. KDP is well dispersed in the polymer matrix as observed from the microstructural studies. Frequency and temperature dependent dielectric properties of the composites have been studied with varying KDP concentrations. The PVA/KDP composite films exhibited extraordinarily high relative permittivity ε′ ∼ 430 (80 times higher compared with pure PVA and even higher than KDP) near the percolation threshold (ϕ C = 2.5 wt % KDP) with low dielectric losses (∼ 0.15) at 1 kHz and room temperature. Such flexible, low loss and high dielectric permittivity material has enormous importance for application in devices. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012