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Influence of nucleating agent self-assembly on structural evolution of isotactic polypropylene during uniaxial stretching

Polymer, ISSN: 0032-3861, Vol: 138, Page: 329-342
2018
  • 37
    Citations
  • 0
    Usage
  • 21
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    37
    • Citation Indexes
      37
  • Captures
    21

Article Description

Dotlike, needlelike, and treelike morphologies of N,N′-dicyclohexyl-2,6-naphthalene dicarboxamide (NJS) are induced via self-assembly. Isotactic-polypropylene (iPP)/NJS composite with treelike NJS shows the highest β-iPP relative crystallinity ( K β ). During uniaxial stretching, a higher K β could increase the number of voids. However, the size of voids is similar regardless of the NJS morphology. The β-α phase transition takes place after void formation. During intralamellar and interlamellar slip, no obvious polymer chains orientation can be found for α-iPP. In the strain range of 0.1–0.6, the c -axis of the β-iPP crystal tends to orient perpendicular to the stretching direction. This is caused by lamellae twisting, a unique deformation mode of β-iPP lamellae. The lamellae twisting is proposed to be responsible for the intense voids formation of the composite with higher K β. At a strain larger than 0.6, the drastic increase of orientation is mainly caused by the rotation of the residual fragmented lamellae and the orientation of the newly formed crystals.

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