A basic type of amino acid, lysine, was used as a novel ecofriendly curing agent of epoxy in electronic materials. Differential scanning calorimetry and in situ Fourier transform infrared spectroscopy characterizations suggested a different reactivity and reaction mechanism for amino acid cured epoxy than for a typical amine or carboxylic acid cured epoxy. The primary amine in the lysine participated in the curing reaction first and was followed by the protonation of the secondary amine NH on another epoxy group and the esterification of the carboxylic group in lysine with epoxide. The crosslinked epoxy with amino acid was thermally degradable and could be used as a reworkable resin as well.
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Li et al. (2005) studied this question.
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