Influence of structure gradients in injection moldings of isotactic polypropylene on their mechanical properties

The internal structure of injection molded model components made from a commercial non-nucleated isotactic polypropylene grade is investigated by wide angle X-ray diffraction and polarized-light optical microscopy

Nasir Mahmood

2020

Scholarcy highlights

  • The internal structure of injection molded model components made from a commercial non-nucleated isotactic polypropylene grade is investigated by wide angle X-ray diffraction and polarized-light optical microscopy
  • Changes in the polymorphic state, degree of crystallinity and spherulitic superstructure are quantified depending on the distance from the outer surface d
  • The influence of structural features on mechanical properties is studied using thin quasi-homogenous films microtomed at different depth from the injection molded component
  • A significant variation of the storage part of the tensile modulus E′ and the toughness Wt depending on the local semi-crystalline state is observed
  • General conclusion is that a deeper understanding of relations between structural state of semi-crystalline polymers determined by the processing conditions and mechanical parameters is of major importance for predicting the properties of injection molded components

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