FIRE RETARDANCY OF GAIALENE? A BIOBASED POLYMER

摘要

This paper describes the flame retardancy of a new biobased polymer i.e. the Gaialene?. Because ofrnits particular composition, namely a starch grafted PP, its fire retardancy was focused on intumescentrnsystem. Indeed fire retardancy of PP by intumescence is well known and also starch has proved itsrneffectiveness as ingredient in intumescent systems. The ingredients chosen were melamine,rnammonium polyphosphate (AP) and organo-modified clay as potential synergist and different ratiosrnwere tested. The fire retardancy was evaluated through mass loss calorimeter (35kW/m~2), UL-94rn(1.6mm) and limiting oxygen index (LOI). It appears that the best formulation is that containing onlyrnAP (30wt.-%). It exhibits 66% reduction of the peak of heat release rate (pRHR) and 85% of the totalrnof heat release (THR). Moreover a V-0 ranking is achieved and the LOI jump from 18 vol.-% to 30rnvol.-% compared to the neat Gaialene?. Thermogravimetric analyses indicate that in all thernformulations a stabilization zone is observed as usually observed in intumescent systems.