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Graphene-Induced Oriented Interfacial Microstructures in Single Fiber Polymer Composites.

John P Abdou1, Gregory A Braggin1, Yanqi Luo1

  • 1Department of Chemistry and Biochemistry, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, California 93407, United States.

ACS Applied Materials & Interfaces
|June 10, 2015
PubMed
Summary
This summary is machine-generated.

Graphene fibers induce oriented isotactic polypropylene (iPP) crystals, forming a transcrystalline (TC) interphase. This study reveals insights into polymer crystallization and interfacial adhesion in graphene-polymer nanocomposites.

Keywords:
adhesioncrystallization kineticsfibersgrapheneinterfacial interactionspolymer composites

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanocomposites

Background:

  • Interfacial interactions are crucial for graphene-enhanced polymer nanocomposite reinforcement.
  • Understanding polymer crystallization behavior around fillers is key to optimizing material properties.

Purpose of the Study:

  • To investigate the dynamic process of graphene-induced oriented interfacial crystals in isotactic polypropylene (iPP) single fiber composites.
  • To analyze the factors influencing transcrystallization and determine interfacial properties.

Main Methods:

  • Preparation of graphene fibers via chemical reduction of graphene oxide fibers.
  • Observation of polymer transcrystallization using polarized optical microscopy (POM) and scanning electron microscopy (SEM).
  • Application of Lauritzen-Hoffman theory for analyzing transcrystallization kinetics.

Main Results:

  • Isotactic polypropylene (iPP) lamellar crystals grow perpendicular to graphene fibers, forming an oriented transcrystalline (TC) interphase.
  • Microstructural analysis revealed a cross-hatched lamellar morphology and strong iPP-graphene interfacial adhesion.
  • Both α-form and, under specific conditions, β-form transcrystals were observed.

Conclusions:

  • Graphene fibers effectively induce oriented transcrystallization in iPP, creating a robust interphase.
  • The study provides a framework for understanding and controlling interfacial structures in graphene-polymer nanocomposites.
  • Findings contribute to the design of advanced materials with enhanced mechanical properties.