Effect of hydrogen bonds on the polymerization of benzoxazines: influence and control
RSC ADVANCES(2016)
Abstract
This work aims to disclose the reason that prohibited the preparation of highly crosslinked polybenzoxazines. Based on experimental study and computer simulations, we found that the dominant -OH center dot center dot center dot N hydrogen bond (Type I -OH center dot center dot center dot N hydrogen bond) of polybenzoxazines blocked high-degree polymerization and resulted in a low crosslink density by decreasing the charge densities of corresponding hydroxyl groups on phenols. As a solution, by introducing additional hydrogen-bond acceptors, the formation of Type I -OH center dot center dot center dot N hydrogen bonds could be suppressed, which enables a high-degree of polymerization of benzoxazines. This novel insight about benzoxazine polymerization is anticipated to help researchers explore more types of polybenzoxazines with enhanced properties.
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Key words
benzoxazines,hydrogen bonds,polymerization
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