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Citation: 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. shu

TEMPERATURE DEPENDENCE OF THE UNPERTURBED DIMENSION OF POLYDIMETHYLSILOXANE Ⅱ. THE EFFECT OF SOLVENT

Received Date: 5 May 1965

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.
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