Dipole moment of poly(ethylene oxide) in solution and its dependence on molecular weight and temperature

Abstract

The dipole moment of poly(ethylene oxide) (PEO) and its dependence on molecular weight and temperature is investigated by measuring the dielectric constant and density of PEO-benzene solutions in the temperature from 25 to 55°C. The dipole moments of the PEO polymers 〈μmolecule2〉1/2. increased linearly with the square root of the degree of polymerization n. The following dipole moment ratio and temperature coefficient were obtained: 〈μ2〉/m2 = 0.472 ± 0.002 (25 °C) and d ln〈μ2〉/dT = (2.11 ±0.28) × 10-3K-1. © 2009 The Society of Polymer Science, Japan.