Macromolecular Research, Vol.28, No.1, 74-81, January, 2020
Synthesis and Properties of Benzoxazine Monomers Bearing Both 3-Methyltetrahydrophtalimide and Nitrile Groups: Para-Para vs. Ortho-Ortho
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Two 3-methytetrahydrophtalimide-functional benzoxazine monomers containing nitrile group have been prepared in order to achieve the basic design rules for developing high-performance thermosets via multifunctional benzoxazines. The chemical structures of the two new synthesized benzoxazine monomers have been confirmed by 1H NMR, 13C NMR and FT-IR. Besides, the polymerization behavior has been studied by using DSC and in situ FT-IR. In addition, the thermal stability and flame retardant properties of the resulting polybenzoxazines have also been investigated using TGA and MCC. The polybenzoxazine based on ortho-3-methytetrahydrophtalimide functional benzoxazine containing ortho-nitrile group exhibits excellent thermal stability and low flammability, with a Td10 of 378 °C and a HRC value of 180 J/(g K).
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