Shape Memory and Recycling Assessment of Novel Epoxy-Acid based Vitrimer with Two Healing Methods
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Thermosets have excellent performances such as high mechanical properties, solvent resistance, and creep resistance. But, they have limitations about recyclability and reprocessability, which raises the problem of creating plastic waste. To solve this problems, recyclable thermosets came out, it is called “vitrimers”. The first vitrimer known by Leibler is an epoxy-acid based vitrimer, which is known to exchange bonds through transesterification reactions. These vitrimers have been studied in various ways and many applications. We synthesized a novel epoxy-acid based vitrimer by adding a molecule that can convert between oligomers and networks through photodimerization/cleavage by UV irradiation in the backbone of a simply epoxy-acid based vitrimer. This is a network state that has both recyclability and reprocessability through vitrimeric behavior induced by heat and pressure, as well as photoreversible by light. It also effectively represents shape memory behavior.