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Dielectric investigation of isotropic and anisotropic solutions of hydroxypropyl cellulose in dioxan
Author(s) -
Moteleb M. M. Abdel,
Naoum M. M.,
Shalaby M. M.,
Saad G. R.
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.1994.210340402
Subject(s) - isotropy , anisotropy , dielectric , materials science , dipole , refractive index , moment (physics) , relaxation (psychology) , absorption (acoustics) , analytical chemistry (journal) , thermodynamics , condensed matter physics , optics , chemistry , composite material , physics , chromatography , organic chemistry , classical mechanics , psychology , social psychology , optoelectronics
The dielectric behaviour of hydroxypropyl cellulose in dioxan has been studied at 10–50°C over a range of concentration of 10–55 wt% to include the isotropic and anisotropic phases. The study showed that the loss maximum ε″ max magnitude of polarization ε 0 − ε ∞ relaxation time 1/2πf m degree of broadening of the absorption curves 1– h or α, and the mean‐square dipole moment 〈 g μ 2 〉, steadily increase with concentration up to 42 wt%, above which a rapid decrease takes place. This indicates that the isotropic solution transforms to an anisotropic solution with a smaller mean dipole moment. The critical concentration is realized to be temperature invariant. This was evidenced by measuring the refractive index of solutions covering the same concentration and temperature ranges.