Abstract
The ability of fluoropolymer based polymer processing aids (PPA) to eliminate surface melt fracture (sharkskin) during extrusion of polyethylene is studied in relation to blend morphology (PPA droplet size) and processing conditions (shear rate). Under a constant throughput, the die entrance pressure, the PPA coating thickness and the degree of fracture are simultaneously monitored. The thickness of the fluoropolymer coating on the die surface is measured in situ through frustrated total internal reflection. A substantial enhancement in the coating rate and the magnitude of the steady state coating thickness as well as the faster elimination of sharkskin upon increase of PPA droplet size have been determined. These results are consistent with a recently developed model of the coating process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
