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Improved FR properties of polyolefins and polycondensates compounds

Several concepts to achieve nanodispersion of Polypropylene (PP) and Polyamide (PA6) nanocomposite systems were developed. A functional oligomer was used as a comptabiliser and clay modified by organic groups was used as filler for PP, however unmodified raw bentonite was used for PA6.

For the PA6 nanocomposite, it was shown that the flammability properties of the PA6 nanocomposites decrease significantly - by more than 50% in comparison with virgin PA6. The synergism with some conventional flame retardant fillers shows interesting properties in respect to electrical applications. It reaches a V0 UL 94 classification and passes the glow wire test for 960°C.

For the PP nanocomposite: No significant results were achieved in terms of flammability. The intumescence concept was tested using the association of PP/PA6 blends and Ammonium PolyPhosphates (AP 750). A significant decrease in the peak of RHR is obtained (80%) in comparison to virgin PP. The combination of micro and nano fillers leads to an increase of mechanical and fire performances. A patent application for the FR compounds was deposited.

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