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Dielectric investigation on poly(methylmethacrylate) films doped with p ‐nitroaniline
Author(s) -
Shafee E. El.
Publication year - 1995
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.1995.210360308
Subject(s) - dopant , relaxation (psychology) , materials science , dielectric , activation energy , doping , nitroaniline , analytical chemistry (journal) , dielectric loss , dipole , atmospheric temperature range , range (aeronautics) , polymer chemistry , chemistry , composite material , thermodynamics , organic chemistry , physics , optoelectronics , psychology , social psychology
The dielectric behaviour of solution‐grown thin films of poly(methylmethacrylate) containing p‐nitroaniline (p‐NA) as a dopant was investigated within the temperature range 60–90°C and a 20–10 5 Hz frequency band. It is shown that these mixtures exhibit only one relaxation process similar to that of pure PMMA. However, the addition of p‐NA increases both the height and the relaxation strength of the peaks and also shifts log f m to higher frequencies. The additive causes narrowing of the loss curves and increases the activation energy for relaxation. These results are interpreted in terms of the hydrogen bonding effects of p‐NA on localized motions of carboxymethyl dipoles in PMMA. An insight into the possible origins of the β‐ and α‐relaxations in PMMA is also presented.