Studies on melt flow properties during capillary extrusion of PP/Al(OH)3/Mg(OH)2flame retardant composites

J. Yang, J. Z. Liang, Chak Yin Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


The apparent melt shear viscosity of polypropylene (PP) composites filled with aluminium hydroxide (Al(OH)3) and magnesium hydroxide (Mg(OH)2) was measured by means of a melt flow rate instrument under experimental conditions of temperature ranging from 170 to 195 °C and load varying from 2.16 to 12.5 kg, to identify the effects of particle size and content. The results showed that the melt shear flow of the composites obeyed the power law under the experimental conditions, the dependence of the melt apparent shear viscosity (ηa) on temperature was consistent with the Arrhenius equation, and the sensitivity of the ηafor the composite melts to temperature increased with addition of flame retardant. The ηaof the composites decreased with increasing apparent shear rate. The ηaincreased with an increase of the content of flame retardant, but this rate of increase decreased with a rise of temperature or load. When the particle size of flame retardant was smaller than 5 μm, the ηaof the composites increased with increase of particle size of flame retardant, and then reduced with a further increase of particle size of flame retardant.
Original languageEnglish
Pages (from-to)907-911
Number of pages5
JournalPolymer Testing
Issue number8
Publication statusPublished - 1 Dec 2009


  • Composite
  • Flame retardant
  • Flow property
  • Polypropylene

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics


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