Carbon nanotubes bridged cerium phenylphosphonate hybrids, fabrication and their effects on the thermal stability and flame retardancy of HDPE
writer：Ran SY, Guo ZH, Chen C, Zhao LP, Fang ZP*
keywords：Carbon nanotubes; Cerium phenylphosphonate; Flame retardancy; Thermal stability
source：期刊
specific source：J Mater Chem. A, 2014, 2(9), 2999-3007
Issue time：2014年
Multiwalled carbon nanotubes (MWNTs) bridged cerium phenylphosphonate (CeHPP) hybrids (Ce-MWNTs) were facilely prepared through in situ introduction of MWNTs into the hydrothermal reaction system of CeHPP, aiming at enhancing flame retardancy of polymer. Morphological observations indicated that MWNTs were acted as bridges to connect CeHPP lamellas to form a consecutive structure. Moreover, due to the good dispersion of CeHPP and the acting force between CeHPP and MWNTs, the hybrids were dispersed uniformly resisting the strong intermolecular attractions. The hybrids led to a reduction in the peak heat release rate (PHRR) of conventional flame retardant high-density polyethylene (HDPE) composite and improved the UL-94 grade from V-2 to V-0, indicating that they could confer better flame retardancy on HDPE compared to CeHPP or MWNTs alone. The results of pyrolysis products and the morphology of chars gave the evidence that Ce-MWNTs could enhance the physical barrier effect to retard the vaporization of flammable gases and the transfer of heat because of the mutual complementarity of CeHPP and MWNTs.