Trigonal P-phase

Polypropylene (PP) with predominant amount of P-phase within the crystalline portion of the material, i.e. P-nucleated polypropylene (P-PP), has been rated as an effective alternative to the common PP (a-PP) due to its specific properties. Material containing trigonal p-phase possesses significantly higher toughness and drawability, however, lower stiffness as compared to material with predominant monoclinic a-phase [1-4]. Excepting the physical properties, the supermolecular stracture plays also an important role in the process of degradation [5-8]. 

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