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- W4307756528 endingPage "111679" @default.
- W4307756528 startingPage "111679" @default.
- W4307756528 abstract "Sodium cyanoborohydride (NaCNBH3) and sodium borohydride (NaBH4) were used as catalysts to lower the ring-opening polymerization (ROP) temperature of 1,3-benzoxazines. According to the dynamic scanning calorimeter (DSC) and Fourier transform infrared (FTIR) studies, the onset ROP temperatures of model benzoxazine were decreased by ca. 80 °C. The activation energies of catalyzed ROP were estimated by Kissinger and Ozawa methods. Moreover, the room temperature behavior of the catalysts in benzoxazine was revealed by 1H NMR and FTIR, and it was found to be dormant at low temperatures and active after 170 °C. Besides catalytic activity, the borohydrides reduced the intense colorization of benzoxazines during curing, and the color changes of catalyzed and uncatalyzed polybenzoxazine samples were measured by colorimetry. Moreover, the thermal stabilities of the catalyzed polybenzoxazines were analyzed and compared to their un-catalyzed counterparts by thermal gravimetric analyses (TGA)." @default.
- W4307756528 created "2022-11-05" @default.
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- W4307756528 date "2022-12-01" @default.
- W4307756528 modified "2023-10-17" @default.
- W4307756528 title "Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring" @default.
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- W4307756528 doi "https://doi.org/10.1016/j.eurpolymj.2022.111679" @default.
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