Determination of nucleus density in semicrystalline polymers from non-isothermal crystallization curves.

Menyhárd, Alfréd and Bredács, Márton and Simon, Gergely and Horváth, Zsuzsanna (2015) Determination of nucleus density in semicrystalline polymers from non-isothermal crystallization curves. MACROMOLECULES, 48 (8). pp. 2561-2569. ISSN 0024-9297

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Abstract

The present study introduces a new calculation method for obtaining nucleus density formed during non-isothermal crystallization of semicrystalline polymers. Isotactic polypropylene homopolymer (iPP) was used as a semicrystalline model polymer and its crystalline structure was modified using highly efficient nucleating agents or different cooling rates in order to manipulate nucleus density (N) within a wide range. The melting and crystallization characteristics were studied by calorimetry (DSC) and the nucleus density was calculated from the crystallization curves recorded under non-isothermal conditions at constant cooling rate. The nucleus density was correlated to the optical property, in fact to the haze index of injection molded plaques in order to qualify the calculated values of N. It was found that N increases more orders of magnitude in nucleated samples and correlates strongly to the optical properties. These observations are according to our expectations and indicate clearly the reliability of the proposed calculation approach.

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