Abstract
The halloysite nanotubes (HNTs-Si) was filled with poly-siloxane and introduced into polypropylene (PP) composite containing intumescent flame retardants (IFR) in order to simultaneously improve the fire performance and mechanical properties. The fire behavior investigation indicated that the peak heat release rate and the peak smoke release rate of PP/IFR sample containing HNTs-Si were reduced by 31% and 26% respectively compared with that of the PP/IFR sample containing HNTs. The elongation at break was greatly increased by the presence of HNTs-Si. The charring mechanism analysis suggested that HNTs-Si was capable of keeping the original tube structure and twisting with degraded PP chains to form “fiber-like” compact char layers in the high temperature range. Consequently, the combination of HNTs-Si and IFR exhibited excellent heat and smoke suppression during the combustion of PP composite. This work has proved that HNTs-Si is an effective synergist in producing flame retardant PP composites with comprehensive properties.
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