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Investigation on the Effects of Bridging Groups in Aromatic Diphenol-Based Benzoxazines: Curing Reaction and H Bonds
journal contribution
posted on 2020-06-19, 16:35 authored by Yuan Liu, Yunyan Peng, Jun Luo, Jingkai Liu, Xiaoqing LiuA bridging
group is an indispensable element for the preparation
of diphenol-based benzoxazines, and inevitably, its electronic features
will affect the H-bond formation of obtained benzoxazine, which is
a crucial factor that not only makes a difference on curing behaviors
of benzoxazine but also poses significant influence on the performances
of cured resins. However, systematical investigation about the effects
of the bridging group on the H bonds in benzoxazine is still in a
barren state. Herein, we bridge the gap with three high-purity model
benzoxazine monomers. The results showed that electron-donating bridge
groups made the benzoxazine monomers tend to start the curing reaction
earlier, whereas the electron-withdrawing bridging groups had the
opposite effect. In addition, it was also confirmed that the H bonds
in polybenzoxazine could be readily tailored by carefully selecting
the bridge groups of aromatic diphenols. In this work, some basic
characteristics about benzoxazine have been revealed, which are helpful
for us to understand its structure–properties relationship
more deeply.