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Transient currents in poly(vinyl alcohol)–poly(vinyl pyrrolidone) polymer blend films
Author(s) -
Narayana K. Lakshmi,
Dasaradhudu Y.,
Rao V. V. R. Narasimha
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210350403
Subject(s) - vinyl alcohol , materials science , polymer , polymer chemistry , dielectric , polymer blend , isothermal process , space charge , relaxation (psychology) , polarization (electrochemistry) , analytical chemistry (journal) , dipole , composite material , chemistry , thermodynamics , organic chemistry , copolymer , psychology , social psychology , physics , optoelectronics , quantum mechanics , electron
Transient currents (charging and discharging currents) in poly(vinyl alcohol) (PVA)–poly(vinyl pyrrolidone) (PVP) polymer blend films were measured over the temperature range 30–150°C at field strengths of 2.32–23.2 × 10 6 Vm −1 . Polymer films were prepared by the isothermal immersion technique. Activation energies were evaluated from quasi‐steady‐state currents. A single relaxation peak was observed both from isochronal currents and low frequency dielectric relaxation. Activation energies evaluated from these two methods are found to be in fairly good agreement. The polarization is considered to be due to space charge origin along with some contribution from dipolar groups. The maximum loss was observed in Sample I (PVA: PVP = 25:75), suggesting maximum heterogeneity in this blend ratio.