Abstract
AbstractA theory of association and entanglement explaining many of the anomalous physical properties of linear high polymers has been evolved. The theory was developed from a Carothers type of relationship in which the apparent molecular weight resulting from entanglement and/or association of long polymer chains was related to the true molecular weight of the free molecules. The effects of molecular weight and association or entanglement have been related to the viscometric behavior of linear polymers. Good agreement between theory and experiment was obtained by introducing experimentally determined constants into the theoretical expression relating molecular weight and zero shear bulk viscosity for dimethylpolysiloxanes and polyisobutylenes. Theory predicts the observed increase in energy of activation for viscous flow and increase in non‐Newtonian behavior with increasing molecular weight.
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