writer：Zhang T*, Yan HQ, Shen L, Fang ZP, Zhang XM, Wang JJ, Zhang BY.
keywords：Polyethylenimine, Phytic acid, Polyelectrolyte complex, Polypropylene, Flammability properties
source：期刊
specific source：RSC Advances, 2014.10, 4: 48285-48292
Issue time：2014年
A new polyelectrolyte complex (PEC), containing phosphorus, nitrogen and carbon elements, has been prepared from positively charged polyethylenimine and negatively charged phytic acid. The PEC shows good performance on improving the thermal stability and flame retardancy of polypropylene (PP). When the content of PEC is 20 wt %, the char residues at 600 oC for the PP/PEC composites (PP/20PEC) is 10.58 wt % under air atmosphere, showing 10.06 wt % higher than that of the pristine PP. Meanwhile, the peak heat release rate and total heat release of PP/20PEC are 815 W g-1 and 33.4 kJ g-1, showing 314 W g-1 and 7.7 kJ g-1 lower than those of pristine PP, respectively. Furthermore, the char residues of PP/20PEC are considerably full and compact, surface of which are covered with perfect intumescent layer. This work proposes a new guideline for designing and fabricating intumescent flame retardant system.