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The transversal dimension of the statistical coil formed by a long‐chain molecule in solution or in bulk rubber is independent of the longitudinal dimension, h1, of the coil as long as h1 is small compared with the length of the stretched molecule. On the other hand, the lateral dimension of a coil whose longitudinal vector, h1, is oriented in the direction of stretch undergoes a forced contraction during the deformation of bulk rubber. The forced contraction of the transversal dimension is therefore supplying an extra contribution to the entropy change. Its amount has been estimated in earlier work and it influences the numerical factor occurring in the formula connecting the strain‐stretch relation for rubber with the molecular weight of the net fragments.

Es hat sich gezeigt, dass die Eigenschaften von Losungen hochpolymerer aus Fadenmolekeln bestehender Verbindungen stark vom P o l y m e r i s a t i o n s g r a d e Z und Ton d e r G e s t a l t der Fadenmolekel abhangen. Zu den Eigenschaften, welche von der Gestalt besonders stark abhangen, gehoren die Visko s i t ii t der Losungen, der B e t r a g und die O r i e n t i e r u n g der S t r o m u n g s d o p p e lb r e c h u n g , sowie die Grossen, welche sich durch Kombination dieser

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