Abstract
The influence of the degree of crystallinity of polymers on their elasticity modulus has been analyzed. Consideration was made of the situation when the amorphous parts of the polymers were in the rubbery state. A semi-crystalline polymer was considered in the form of a polymeric network in which the crystallites played the role of physical cross-links. Generalized equation of the rubber elasticity was applied to the analysis; this equation contained the Van-der-Waals volume of the cross-links and also the volume of a repeat unit of linear fragments. It was found that reduction of the crystallites size down to nanosize essentially increased the elasticity modulus at their fixed concentration.
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