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Effect of La2O3 on the thermal stability of polybenzoxazine based on 4,4′-diaminodiphenyl methane

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Abstract

La2O3/polybenzoxazine composite was prepared through incorporating La2O3 into benzoxazine based on phenol and 4,4′-diaminodiphenyl methane (BB) to study the effect of La2O3 on the thermal stability of crosslinked polybenzoxazines. The ring-opening polymerization of BB benzoxazine was analyzed by DSC and measurement of viscosity. The structure and the thermal stability of BB polybenzoxazine were characterized by FTIR, TGA and DMA. The thermal degradation processes of polybenzoxazine were investigated using TGA-FTIR. The results showed that La2O3 could form coordination interaction with the nitrogen atoms of BB and thus promoted the polymerization of BB benzoxazine. The coordination interaction could not influence the volatilization of the amine degradation gases during the thermal degradation process of BB polybenzoxazine due to the amine structure existing in the chemical crosslinking network of polybenzoxazine and being stable. Furthermore, the coordination interaction weakened the C-N and C-C bonds in CH2-NR-CH2- of BB polybenzoxazine and thus accelerated the appearance and volatilization of the phenolic gases during the thermal degradation process, resulting in the decrease of the thermal stability and char yield at 800 °C of BB polybenzoxazine.

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Acknowledgments

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (NO. 20774060).

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Authors and Affiliations

  1. State Key Laboratory of Polymeric Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China

    Yongfei Zhu, Hong Ling & Yi Gu

  2. Guangxi Teachers Education University, Nanning, Guangxi, 530001, China

    Yongfei Zhu

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  1. Yongfei Zhu
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  2. Hong Ling
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  3. Yi Gu
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Correspondence to Yi Gu.

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Zhu, Y., Ling, H. & Gu, Y. Effect of La2O3 on the thermal stability of polybenzoxazine based on 4,4′-diaminodiphenyl methane. J Polym Res 19, 9904 (2012). https://doi.org/10.1007/s10965-012-9904-7

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  • DOI: https://doi.org/10.1007/s10965-012-9904-7

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