Note on the Influence of Structure on Internal Pressure in Polymeric Systems

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Abstract
The development of the preceding paper is applied to the calculation of the internal pressure contribution arising from the nature of the polymer structure. A network structure imposes a positive (compressive) internal pressure which increases with the degree of interlinking. In polymers composed of finite molecules the internal pressure should, of course, decrease in proportion to the reciprocal of the molecular weight. A general formula for the dependence of the internal pressure on polymer structure is given which embraces both of these extreme cases and includes also imperfect network structures possessing unattached terminal groups. Magnitudes of the calculated internal pressure contributions are sufficient to alter the specific volumes perceptibly.

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