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• W2285207900 abstract "A series of novel type bisphthalonitriles with different molecular weight main-chain polybenzoxazines as linkages have been successfully synthesized using 4, 4′-diaminodiphenyl methane, paraformaldehyde, bisphenol A and 4-nitrophthalonitrile as initial materials. The structures were characterized by Fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (1H-NMR). The formation of benzoxazine and the existence of nitrile groups were confirmed by the absorbance at 950cm−1 of benzene attached with oxazine ring and 2231 cm−1 of nitrile groups. The characteristic resonance peaks observed at about 4.52 (C-CH2-N) and 5.28 ppm (N-CH2-O) also determined the structure of benzoxazine ring. The curing behaviors were monitored by differential scanning calorimetry (DSC) and FT-IR. Two-stage polymerization mechanisms were observed according to the ring-opening of benzoxazine and the polymerization of nitrile groups catalyzed by phenolic hydroxyl groups, which generated during the curing reaction of benzoxazine. The polymerization of these bisphthalonitriles exhibited self-promoted curing behaviors. The completion of polymerization was proved by the disappearance of the band located at 950 cm−1 in FT-IR. Thermogravimetric analysis (TGA) was used to investigate the thermal stability, and the results showed that the cured polymers achieved extremely high char yield from 61.1% up to 74.2% at 800°C under nitrogen and exhibited increasing decomposition temperature as the contents of phthalonitrile groups increased, which indicated that the polymerization of phthalonitriles could improve the thermal stability." @default.
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• W2285207900 date "2016-02-02" @default.
• W2285207900 modified "2023-10-18" @default.
• W2285207900 title "Synthesis and characterization of novel bisphthalonitrile resins linked by different molecular weight main-chain polybenzoxazines" @default.
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• W2285207900 doi "https://doi.org/10.1080/10601325.2015.1132919" @default.
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