Ultrasonic-Assisted Extrusion Processing for Enhancing Physical Properties of High-Density Polyethylene by Flow-Induced Crystallization
Mansoureh Jamalzadeh, David O. Kazmer, Patrick Casey, E. Bryan Coughlin, Margaret J. Sobkowicz
TL;DR
This paper explores using ultrasonic-assisted extrusion to improve the crystallinity and properties of high-density polyethylene films.
Contribution
The novel use of ultrasonic fields during extrusion to induce crystallinity and enhance polymer properties without additives.
Findings
Ultrasonic shear rates significantly influence lamellar spacing and amorphous fraction redistribution in HDPE.
Ultrasonic-assisted extrusion improves mechanical and oxygen barrier properties of monolayer films.
Regression models correlate HDPE structure, processing, and performance effectively.
Abstract
The evolution of crystallinity resulting from stress imposed on a melt, known as flow-induced crystallinity, can strongly influence the mechanical and physical properties of semicrystalline polymers. This study investigates shear-induced crystallization by applying an ultrasonic field to the melt flow as it passes through dies with various geometries. A custom-built sonication die is employed for controlling the dynamic temperature and shear environment, resulting in molecular alignment and potential for flow-induced crystallization. Application of both conventional and ultrasonic shear rates at the equilibrium melt temperature of high-density polyethylene (HDPE) was investigated to accelerate crystallinity and manipulate the crystal morphology across the film in pursuit of improved mechanical and gas barrier properties without the need for additives or other polymer layers. The…
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Taxonomy
TopicsPolymer crystallization and properties · Polymer Foaming and Composites · Injection Molding Process and Properties