Degradation of anhydride-cured epoxy resin using simultaneously recyclable solvent and organic base catalyst
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Alkaline catalyst is usually used for solvolysis of thermoplastic and thermoset polymers containing ester bonds. However, inorganic catalyst is difficult to remove from products of resin degradation. Here, we reported an efficient and mild degradation method using an organocatalyst, N-methyl-4-piperidinol, in ethylene glycol to degrade methylcyclohexene-1,2-dicarboxylic anhydride (MeTHPA)-cured epoxy resin. N-Methyl-4-piperidinol and ethylene glycol were simultaneously recovered by vacuum distillation. The effects of reaction temperature and catalyst concentration on the reaction rate and kinetics of the degradation reaction were analyzed. The recovery and reuse of ethylene glycol and the catalyst for three cycles were also demonstrated. The degradation products from the epoxy resin were identified by electrospray ionization-mass spectrometry (ESI-MS), and a transesterification mechanism for the degradation of epoxy resin was proposed.
KeywordsEpoxy resin Organic base Recyclable Ethylene glycol Degradation
The work is financially supported by the National Natural Science Foundation of China (NSFC 51103154), the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (KGCX2-YW-230 and KGCX2-EW-211) and Jilin Province Science and Technology Development Program (20140204057GX).
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