Improving the performance of a catalytic system for the synthesis of ultra high molecular weight polyethylene with a reduced number of entanglements

Sara Ronca, Dario Romano, Giuseppe Forte, Efren Andablo-Reyes, Sanjayc Rastogi

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Based on the PVT (pressure–volume–temperature) behavior of polymer, a novel process control methodology for injection molding is presented in this study.With the present control method, the process pressure is controlled by cavity temperature instead of time, which is used in a conventional injection-molding process; thus the relationship between P (pressure) and T (temperature) can be controlled, which means that the V (volume) or part weight can be controlled because of the invariable PVT relationship of polymer. The objective of this study is to validate the feasibility of this process control methodology and examine its consistency. Experiments were conducted on an injection-molding machine with an opened-loop microprocessor controller. The weight of the molded parts serves as the mainmeasure to probe the process capabilities. The variation of the mold temperature was monitored. The experimental results reveal that the present PVT control method yields much better part quality and uniform part weight than the conventional P–time (pressure–time) control method. It is also proved that the novel process control methodology can be used to accommodate the product weight change due to variation of themelt or mold temperature
Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalAdvances in Polymer Technology
Volume31
Issue number3
DOIs
Publication statusPublished - Sep 2012

Keywords

  • Catalysis
  • Entanglements
  • Melt Rheology
  • Polyolefins
  • UHMWPE

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