Melt extrudate swell behavior of graphene nano-platelets filled-polypropylene composites

J. Z. Liang, Q. Du, L. Y. Wei, Chi Pong Tsui, Chak Yin Tang, Wing Cheung Law, S. D. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


Abstract The extrudate swell ratios of polypropylene (PP) composite melts filled with graphene nano-platelets (GNPs) were measured using a capillary rheometer within a temperature range of 180-230°C and apparent shear rate varying from 100 to 4000 s-1in order to identify the effects of the filler content and test conditions on the melt die-swell behavior. It was found that the values of the extrudate swell ratio of the composites increased with increasing apparent shear rate, with the correlation between them obeying a power law relationship, while the values of the extrudate swell ratio decreased almost linearly with rise in temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, and decreased roughly linearly with an increase of the GNP weight fraction. In addition, the extrudate swell mechanisms are discussed from the observation of the fracture surface of the extrudate using scanning electronic microscopy. This study provides a basis for further development of graphene reinforced polymer composites with desirable mechanical performance and good damage resistance.
Original languageEnglish
Article number4453
Pages (from-to)179-184
Number of pages6
JournalPolymer Testing
Publication statusPublished - 2 Jul 2015


  • Die-swell
  • Extrusion
  • Graphene nano-platelets
  • Melt
  • Polymer-matrix composites
  • Polypropylene

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry


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