Abstract: 9,9-bis(4-hydroxyphenyl)-fluorene (Bisphenol Fluorene，BHPF) was synthesized from phenol and 9-fluorenone using 98% sulfuric acid as catalyst and 2-mercaptopropionic as promoter, and then a liner BHPF-diamine benzoxazine (BF-eda resin) was synthesized using BHPF, ethylenediamine and paraformaldehyde. Chemical structure of the BF-eda resin were verified by Fourier transform infrared spectroscopy (FT-IR), 1H and 13C nuclear magnetic resonance spectroscopies(NMR). The GPC analysis presents the number average molecular weight of BF-eda resin is 4690，and the polydispersity index (PDI) is 2.93. The curing behavior of BF-eda resin was studied by differential scanning calorimetry (DSC) and the thermal stabilization of polybenzoxazine was evaluated with thermogravimetric analysis (TGA).The ring-opening polymerization temperature of BF-eda resin is about 253℃, the thermal decomposition temperature of polybenzoxazine is 344℃, the temperature at 5% weight loss is 357℃, and the char yield ratio is 51% at 900℃.

Key words: 9,9-bis(4-hydroxyphenyl)-fluorene(BHPF), benzoxazine, liner bisphenol fluorene-diamine benzoxazine, thermal resistance