Journal:polym. bull.
Abstract:The effects of allophane (ALL) as a synergistic agent on the flame
retardancy and thermal stability of intumescent flame-retardant (IFR) polypropylene
composites were studied by limiting oxygen index (LOI), UL-94 test, cone
calorimeter test (CONE) and thermogravimetric analysis. The incorporation of ALL
led to enhanced thermal stability, LOI value and UL-94 ratings. CONE tests indicated
that heat release rate, peak rate of heat release, smoke production rate, total
smoke production and mass loss values of PP/IFR/ALL sample were much lower
than those of PP/IFR and pure PP samples. Fourier transform infrared spectrometry
result proved the presence of silicoaluminophosphate which can act as a catalytic
agent to enhance the oxidative dehydration crosslinking charring process. Scanning
electron microscopy and Raman spectra observation demonstrated that ALL could
promote forming homogenous and compact char layer. The mechanical properties
of PP composites were also improved by the loading of ALL.
Issue:72
Page Number:2089–2104
Translation or Not:no
Date of Publication:2015-04-22
Included Journals:SCI