摘要
In order to improve the mechanical properties without reducing its flame retardancy of phenolic foams(PFs),9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO)was introduced in the structure of cashew nut shell liquid(CNSL)to improve its flame retardant,and the product of DOPO grafting CNSL(DOPO-g-CNSL)was obtained to modify phenolic resin,and to prepare DOPO-g-CNSL modified PFs(DCMPFs).The structures of DOPO-g-CNSL were verified by Fourier transform infrared spectroscopy(FT-IR)and nuclear magnetic resonance(1H-NMR).Compared with CNSL,thermal stability of DOPO-g-CNSL was decreased and Ti decreased by 3.53%,but the residual carbon(800°C)was increased by 35.05%.Compared with pure PF,the mechanical properties,toughness and flame retardancy of DCMPFs were increased when the ratio of DOPO-g-CNSL to phenol(DOPO-g-CNSL/P)was no more than 10%.With the dosage of DOPO-g-CNSL/P increased,Ti of DCMPFs was slightly increased,but the carbon residues(800°C)were almost unchanged.And the cell sizes of DCMPFs were basically the same as the pure PF.By comprehensive analysis,the suitable dosage of DOPO-g-CNSL/P was no more than 10%.
基金
by The Youth Innovation Fund of Nanjing Forestry University(CX2016011)
Nanjing Forestry University High-Level(High-Educated)Talents Scientific Research Funds(GXL2014033)。
