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Citation: YU SHIH-CHENG, CHEN TING-PIN. THE EXPANSION OF POLYDIMETHYLSILOXANE CHAIN DIMENSION IN SOLUTIONS[J]. Acta Polymerica Sinica, ;1965, 7(5): 345-348. shu

THE EXPANSION OF POLYDIMETHYLSILOXANE CHAIN DIMENSION IN SOLUTIONS

Received Date: 19 January 1965

The intrinsic viscosities of twelve fractions of polydimethylsiloxane (Mη = 9.1×104-6.0×106) were determined in heptane and toluene solutions at 25℃. The values ofexpansion factor calculated from the Flory-Fox theory of intrinsic viscosity, α3 = [η]/[η]θ , givelinear plots of α5-α3 vs Mnnnnnnn1/2, and the molecular weight dependence of a is not in accord with the theory of Kurata-Stockmayer-Roig.
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