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Microwave dielectric relaxation study of poly(propylene glycol) in dilute solution
Author(s) -
Sengwa R J,
Chaudhary Rakhee,
Kaur Kulvinder
Publication year - 2000
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 - 10.1002/1097-0126(200011)49:11<1308::aid-pi477>3.0.co;2-d
Subject(s) - dielectric , ethylene glycol , cyclohexane , relaxation (psychology) , solvent , benzene , polyvinyl alcohol , polymer chemistry , dipole , intermolecular force , materials science , carbon tetrachloride , molecule , chemistry , dielectric loss , organic chemistry , psychology , social psychology , optoelectronics
Dielectric relaxation studies of poly(propylene glycol), average molecular weight 2000 g mol −1 , in dilute solution of cyclohexane, decaline, benzene and carbon tetrachloride have been carried out at 10.10 GHz and 35 °C. Average relaxation time τ 0 , and relaxation times corresponding to segmental motion τ 1 , group rotations τ 2 and dipole moment µ have been determined. It is found that τ 0 , τ 1 and µ are influenced by the solvent environment while the τ 2 value is solvent‐independent. A comparison has been made with the dielectric behaviour of poly(ethylene glycol), average molecular weight 1500 g mol −1 , in dilute solutions of benzene and carbon tetrachloride because both systems have an equal number of monomer units. The effect of methyl side‐groups on dielectric relaxation in poly(propylene glycol) molecules is discussed. The Kirkwood correlation factor is also evaluated in dilute solutions with concentration variation and it is found that these molecules exist in cluster form due to intermolecular hydrogen bonding. © 2000 Society of Chemical Industry