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A series of thermally stable spiro-centered bis(benzoxazine) monomers (BPSPI/SPBC-Bz)s was synthesized using spirobiindane/spirobischroman phenol, different amines (aniline, p -toluidine, and 2-(4-aminophenyl)ethanol) and paraformaldehyde and was characterized by FT-IR, 1 H and 13 C NMR, and elemental analysis. The effect of incorporation of two different types of spiro-center on polymerization temperature of benzoxazine and thermal stability of resulting polymers was evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The curing occurred at high temperatures in both BPSPI-Bzs and SPBC-Bzs (275 °C), which lowered by incorporating hydroxyl group (250 °C) at the end. Spirobiindane based polybenzoxazines showed higher thermal stability with T g in the range of 295–354 °C, initial degradation temperature at 10% weight loss at 397–405 °C and char yield of 37–42% at 600 °C compared to spirobischroman polybenzoxazines.
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Kolanadiyil et al. (2015) studied this question.
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