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Latent curing systems stabilized by reaction equilibrium in homogeneous mixtures of benzoxazine and amine
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Latent curing systems stabilized by reaction equilibrium in homogeneous mixtures of benzoxazine and amine
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Journal Article
Latent curing systems stabilized by reaction equilibrium in homogeneous mixtures of benzoxazine and amine
2016
Overview
Latent curing systems are widely used in industrial thermosets in applications such as adhesion, coating, and composites. Despite many attempts to improve the practicality of this dormant reaction system, the majority of commercially available latent products still use particulate hardeners or liquid compounds with blocked active groups. These formulations generally lack fluidity or rapid reaction characteristics and thus are problematic in some industry applications. Here we describe a novel concept that stabilizes highly reactive benzoxazine/amine mixtures by reaction equilibrium. These new latent benzoxazine curing systems have a long storable lifetime but very short gel time at 150 °C. The reversible reaction between benzoxazine and amine is further demonstrated by FT-IR spectral measurements and rheological experiments, and it is shown that the overall characteristics of the latent system are promising for many industrial applications.
Publisher
Nature Publishing Group UK,Nature Publishing Group
