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Area of Science:

  • Polymer Science
  • Materials Science
  • Rheology

Background:

  • Flow-induced crystallization significantly impacts semicrystalline polymer properties.
  • Understanding shear effects on melt processing is crucial for material enhancement.
  • Current packaging often relies on multilayer structures for desired properties.

Purpose of the Study:

  • Investigate shear-induced crystallization using ultrasonic fields in polymer melt flow.
  • Explore the potential of ultrasonic-assisted extrusion for high-density polyethylene (HDPE) films.
  • Develop single-material films with enhanced properties to replace multilayer packaging.

Main Methods:

  • Utilized a custom-built sonication die to control shear and temperature during melt flow.
  • Applied conventional and ultrasonic shear rates to HDPE melts.
  • Analyzed polymer structure and properties using Wide- and Small-Angle X-ray Scattering (WAXS/SAXS), tensile testing, and Oxygen Transmission Rate (OTR).

Main Results:

  • Ultrasonic shear rates significantly influenced lamellar spacing and amorphous fraction redistribution.
  • Both conventional and ultrasonic shear affected crystalline domain structure.
  • Processing conditions directly correlated with mechanical and gas barrier performance.

Conclusions:

  • Ultrasonic-assisted processing can accelerate crystallinity and manipulate morphology in HDPE films.
  • Enhanced crystallinity leads to improved mechanical and gas barrier properties.
  • This technology offers potential for single-material films in packaging, reducing reliance on complex multilayer structures.