YU SHIH-CHENG, CHANG YU-YING. TEMPERATURE DEPENDENCE OF THE UNPERTURBED DIMENSION OF POLYDIMETHYLSILOXANE Ⅱ. THE EFFECT OF SOLVENT[J]. Acta Polymerica Sinica, 1965,7(6):461-464.
YU SHIH-CHENG, CHANG YU-YING. TEMPERATURE DEPENDENCE OF THE UNPERTURBED DIMENSION OF POLYDIMETHYLSILOXANE Ⅱ. THE EFFECT OF SOLVENT[J]. Acta Polymerica Sinica, 1965,7(6):461-464.DOI:
The instrinsic viscosities of five fractions of polydimethylsiloxane in the molecular weight range .Mη= 2.8×105-2.5×106 were determined in two θ-solvents
butanone (Tθ= 20℃) and bromobenzene (Tθ=78℃). Viscometric data of both systems conform to the relationship [η]θ = KθM0.50 with Kθ= 6.80×10-2 and 7.73×10-2 in butanone and bromobenzene respectively. The value of △1n[η]θ/△1nT thus obtained from thevalues of Kθ at two θ-temperatures is 0.71. Using the Flory-Fox theory of intrinsicviscosity
we get d 1n h02/d-dlnT=0.47. The value is higher than that obtained in the ethyl-benzene-diethylphthalate mixed solvent system.