novel benzoxazine-containing temperature T-sensitive fluorescent polyfluorenes (BluePF-BZ) had been prepared. A benzoxazine monomer (BHPF-paa) was firstly synthesized with 9,9-Bis(4-hydroxyphenyl) fluorene, propargylamine and paraformaldehyde through Mannich condensation reaction. The as prepared BHPF-paa was then incorporated into the preparation of polyfluorenes, and the main-chain BIuePF-BZ could finally be obtained. The structures of the obtained monomer and polyfluorenes were characterized by H-1 NMR and FTIR. The BluePF-BZ was finally incorporated into epoxy resin (E44 + D230) to fabricate the T-sensitive material. The thermal stability, optical stability, and T-sensitive fluorescent properties of BluePF-BZ/E44 + D230 were investigated. The BluePF-BZ/E44 + D230 system showed high spectral thermal stability and reversible T-sensitive fluorescent response in relative high temperature (>433 K). To the best of our knowledge, this is the first report about the T-sensitive fluorescent property of PE Its mechanism of T-sensitive fluorescent property was also studied by comparative experiment and molecular simulation. (C) 2016 Elsevier Ltd. All rights reserved.