Effect of Iron acetylacetonate on the crosslink structure, thermal and flammability properties of novel aromatic diamine-based benzoxazines containing cyano group
writer：Yan HQ, Wang HQ, Cheng J, Fang ZP*
keywords：benzoxazine; Iron acetylacetonate; thermal property; flammability property
source：期刊
specific source：RSC Advances, 2015.1, 5: 18538-18545
Issue time：2015年
Iron acetylacetonate (Fe(AcAc)3) was chosen as catalyst for a novel aromatic diamine-based benzoxazine containing cyano group (BAPBACP). Its effect on the curing process, thermal and flammability properties of BAPBACP were investigated. The results indicated that without Fe(AcAc)3 the ring-opening polymerization of the BAPBACP monomer occurred and an arylamine Mannich bridge structure was formed at the low curing temperature stage; and then cyclotrimerization of cyano group followed at the high curing temperature stage, but the cyano group was not fully cyclotrimerized even after curing at 350 oC for 0.5h. Addition of 3.5% Fe(AcAc)3 speeded up the curing reaction and the cyano group was fully cyclotrimerized at 350 oC. Thermogravimetric analysis and microscale combustion calorimetry results showed that the poly(BAPBACP) resins possess excellent thermal and flammability properties due to the existence of the arylamine Mannich bridge structure and triazine ring in their crosslinked structure.