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Abstract
The solubility parameter (δ) of chlorosulfonated polyethylene-Hypalon™ 45 was determined by means of theoretical calculations, equilibrium swelling and turbidimetric techniques. The average repeating unit of the polymer was determined from chlorine and sulphur determinations and from NMR and thermal degradation data. Calculated δ from the individual contributions of atoms and groups yielded δ = 9.46 (cal cm3)1 2. Equilibrium swelling measurements gave δ = 7.2 ± 1.9 (cal cm3)1 2 and turbidimetric measurements δ = 7.4 + 1.9 (cal cm3)1 2. The latter technique also made it possible the determination of the spatial components of δ: dispersive δd = 7.2 ± 1.7(cal cm3)1 2. dipolar δp = 0.9 ± 0.3(cal cm3)1 2 and hydrogen bonded δh = 1.4 ± 0.3 (cal cm3)1 2.