Both pyrogallol-furfurylamine-based and pyrogallol-aniline-based di-benzoxazines (PG-FA and PG-A) possess a free hydroxyl and latent catalytic characteristics. To decrease the ring-opening polymerization (ROP) temperature of benzoxazine based on phenol and 4,4′-diaminodiphenylmethane (P-DDM) and increase simultaneously thermal property of its polymer, PG-FA and PG-A as catalysts were introduced into P-DDM. DSC and FTIR tests were used to investigate the effect of PG-FA and PG-A on the ROP of P-DDM; DMA, FTIR and TGA were performed to study their effects on the hydrogen bonds and thermal property of the cured P-DDM (PP-DDM). The results indicate that the ROP temperature of P-DDM remarkably decreased with the incorporation of PG-FA and PG-A. FTIR and DMA results illustrate that the total amounts of hydrogen bonds in PP-DDM increased with the addition of PG-FA or PG-A; however, its fraction of –OH⋯N (intra) and O−⋯+HN (intra) hydrogen bonds decreased. The decrease in –OH⋯N hydrogen bonds made the cross-linked density of polybenzoxazine increase, resulting in that the thermal stability of PP-DDM enhanced with the introduction of PG-FA and PG-A.

中文翻译：

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联苯三酚基苯并恶嗪的加入促进苯并恶嗪的开环聚合及其热性能

基于连苯三酚-糠胺和基于连苯三酚-苯胺的二苯并恶嗪（PG-FA 和 PG-A）均具有游离羟基和潜在催化特性。为了降低基于苯酚和 4,4'-二氨基二苯甲烷 (P-DDM) 的苯并恶嗪的开环聚合 (ROP) 温度并同时提高其聚合物的热性能，将 PG-FA 和 PG-A 作为催化剂引入 P -DDM。DSC和FTIR测试用于研究PG-FA和PG-A对P-DDM ROP的影响；进行 DMA、FTIR 和 TGA 以研究它们对固化 P-DDM (PP-DDM) 的氢键和热性能的影响。结果表明，随着PG-FA和PG-A的掺入，P-DDM的ROP温度显着降低。FTIR和DMA结果表明PP-DDM中的氢键总量随着PG-FA或PG-A的加入而增加；然而，它的–OH⋯N（内部）和O−⋯+HN（内部）氢键的比例减少了。–OH⋯N氢键的减少使聚苯并恶嗪的交联密度增加，导致PP-DDM的热稳定性随着PG-FA和PG-A的引入而增强。