Abstract
AbstractDielectric relaxation studies of poly(ethylene glycols), average molecular weight 200–9000, have been carried out in carbon tetrachloride solutions at microwave frequency, i.e. 9.83 GHz. Average relaxation times τ0 and relaxation times corresponding to segmental motion τ1, and group rotations τ2 have been calculated. The variations of relaxation times with increase in degree of polymerization and temperature have been determined. With the increase in the degree of polymerization the flexibility increases and hence the coiling of the chain increases. At a certain temperature there is a decrease in the relaxation time corresponding to segmental motion, suggestive of some switch‐over mechanism in higher polymers. The relaxation time corresponding to group rotations is independent of temperature and degree of polymerization.
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