Viscosity-Molecular Weight Relation for High Molecular Weight Poly-(dimethylsiloxane)

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  • FURUYA Susumu
    Nippon Telegraph and Telephone Public Corporation, Electrical Communication Laboratory

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  • 高粘度ポリジメチルシロキサンの粘度と分子量の関係
  • コウネンド ポリジメチルシロキサン ノ ネンド ト ブンシリョウ ノ カンケイ

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Viscosities of five poly-(dimethylsiloxane) samples of molecular weights ranging from 6.1×104 to 23.5×104 were determined by using capillary pipette, falling sphere and cone-and-plate viscometers. The molecular weights were estimated from intrinsic viscosities in toluene at 25°C., using Kolorelov et al.'s equation, instead of Barry's equation employed by previous investigators.<br>The melt viscosities measured at low shear rates were related to molecular weight M by the eqation, logη40°C=3.5logM-14.88.

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