Synthesis of heat-resistant benzoxazine-based polyfluorene and its reversible temperature-sensitive fluorescence

Publication date: 27 January 2017
Source:Polymer, Volume 109
Author(s): Weizhi Li, Xiangai Yuan, Jin Huang, Bang'an Peng, Feng Zhou, Jing Ma, Xudong Jia
A 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 BluePF-BZ could finally be obtained. The structures of the obtained monomer and polyfluorenes were characterized by ¹H 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 PF. Its mechanism of T-sensitive fluorescent property was also studied by comparative experiment and molecular simulation.

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