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Thermally stimulated depolarization current studies on PC/PTBF blends
Author(s) -
Kalkar A. K.,
Kundagol Shankar,
Chand Suresh,
Chandra Subhas
Publication year - 1994
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.1994.070541218
Subject(s) - electret , polycarbonate , materials science , poling , polarizability , electric field , polarization (electrochemistry) , analytical chemistry (journal) , depolarization , polymer blend , dipole , activation energy , dielectric , polymer chemistry , polymer , composite material , chemistry , physics , organic chemistry , optoelectronics , ferroelectricity , medicine , quantum mechanics , molecule , copolymer , endocrinology
Thermally stimulated depolarization current (TSDC) studies have been carried out on blends of polycarbonate (PC) and poly( p ‐ t ‐butyl phenolformaldehyde) (PTBF) using electric poling at temperatures ranging from 348°K to 383°K. The PC/PTBF blends poled at identical electric field ( E p ) and temperature ( T p ) exhibit a continuous distribution of polarizability (in general, in the range 300°K to 450°K) with a blend composition dependent single peak ( T M ). With increasing E p and T p , the TSDC peak of a blend shifts toward higher temperature with increasing peak current ( I M ) and charge ( Q ) associated with the peak. The effects of polarization field and temperature indicate that the polarization in the blend system is due to induced dipole formation. The activation energy decreases with increasing PTBF content in the blend, indicating shallow traps in PC/PTBF electret. The present blend electrets, however, comparative to its two components PC and PTBF, store more charge but decay faster. © 1994 John Wiley & Sons, Inc.