Effect of the molecular structure of the polymer and nucleation on the optical properties of polypropylene homo-and copolymers

Zsuzsanna Horváth, Alfréd Menyhárd, Petar Doshev, Markus Gahleitner, György Vörös, József Varga, Béla Pukánszky

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21 Citations (Scopus)

Abstract

Two soluble nucleating agents were used to modify the optical properties of nine PP homo-and random copolymers. The ethylene content of the polymers changed between 0 and 5.3 wt %. Chain regularity was characterized by the stepwise isothermal segregation technique (SIST), while optical properties by the measurement of the haze of injection molded samples. Crystallization and melting characteristics were determined by differential scanning calorimetry (DSC). The analysis of the results proved that lamella thickness and change in crystallinity influence haze only slightly. A model was introduced which describes quantitatively the dependence of nucleation efficiency and haze on the concentration of the nucleating agent. The model assumes that the same factors influence the peak temperature of crystallization and optical properties. The analysis of the results proved that the assumption is valid under the same crystallization conditions. The parameters of the model depend on the molecular architecture of the polymer. Chain regularity determines supermolecular structure and thus the dependence of optical properties on nucleation.

Original languageEnglish
Pages (from-to)7456-7463
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number10
DOIs
Publication statusPublished - May 28 2014

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Keywords

  • crystalline structure
  • haze
  • molecular structure
  • nucleation
  • polypropylene

ASJC Scopus subject areas

  • Materials Science(all)

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