writer：Gu, Limin，Ge, Zhen，Huang, Muhua， Luo, Yunjun*
keywords：flame retardance; functionalization of polymers; polyurethanes; thermogravimetric analysis
source：期刊
specific source：Journal of Applied Polymer Science
Issue time：2015年
A novel phosphorus-nitrogen flame retardant, octahydro-2,7-di(N,N-dimethylamino)-1,6,3,8,2,7-dioxadiazadiphosphecine (ODDP), with bi-phosphonyl in a cyclic compd., was synthesized by the reaction of POCl3, NH(CH3)2·HCl with OHCH2CH2NH2 in CH2Cl2 soln., and characterized by Fourier transform IR spectrometer, NMR, and mass spectrum.  ODDP has been successfully reacted with polyurethane (PU) as a chain extender to prep. phosphorus-nitrogen synergistic halogen-free flame-retardant waterborne PU (DPWPU).  Limiting oxygen index (LOI), UL-94, thermogravimetric anal. and SEM suggest the excellent flame retardancy of the DPWPU polymer.  When the content of ODDP was 15 wt %, the LOI of DPWPU was 30.6% and UL-94 achieved a V-0 classification.  Compared with the unmodified WPU, the thermodecompn. temp. of the DPWPU was reduced and the amt. of carbon residue was increased to 18.18%.  The surface of carbon residue was shown to be compact and smooth without holes, which would be favorable for resisting oxygen and heat. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41288. [on SciFinder(R)]