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Melt density and volume flow rate of polypropylene/Al(OH) 3 /Mg(OH) 2 flame retardant composites
Author(s) -
Liang J. Z.,
Tang C. Y.,
Zhang Y. J.
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32370
Subject(s) - zinc borate , polypropylene , materials science , composite material , fire retardant , melt flow index , composite number , hydroxide , volumetric flow rate , volume fraction , volume (thermodynamics) , mass fraction , aluminium hydroxide , magnesium , aluminium , polymer , chemistry , metallurgy , organic chemistry , physics , quantum mechanics , copolymer
Polypropylene (PP) flame retardant composites filled with aluminum hydroxide (Al(OH) 3 ), magnesium hydroxide (Mg(OH) 2 ) as well as zinc borate (ZB) were prepared with a twin‐screw extruder. The melt volume flow rate ( MVR ) and density of the composites were measured by means of a melt flow rate instrument under experimental conditions with temperature of 180°C and load varying from 2.16 to 5 kg, to identify the effects of the particle size and content. The results showed that MVR of the composites decreased with an increase of the filler weigh fraction (ϕ f ) when ϕ f was more than 10 phr. The MVR decreased first and then increased with an increase of the filler diameter ( d ). The melt density (ρ m ) of the composites increased linearly with an increase of ϕ f and decreased linearly with the increase of d . In addition, the ρ m increased with an increase of load. Under the same experimental conditions, the MVR decreased slightly while the ρ m increased somewhat with addition of ZB for the PP/Al(OH) 3 /Mg(OH) 2 composite systems. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010