Synthesis of Di(2-diazo-2-phenylacetic acid)-1,4-Butanediol Ester and Its Application in the Crosslinking of Polycaprolactone
Under certain conditions,the diazo compound can release nitrogen to form carbene structure,which can cross-link the low surface energy polycaprolactone material to obtain the cross-linked polycaprolactone material with shape memory effect.In this paper,a diazo crosslinker,di(2-diazo-2-phenylacetic acid)-1,4-butanediol ester,was synthesized successfully.The synthesis conditions of the crosslinker were optimized,and the yield of the crosslinker is up to 92.8％.The synthesized di(2-diazo-2-phenylacetic acid)-1,4-butanediol ester was successfully applied to the crosslinking of polycaprolactone(PCL).When the additive amount of di(2-diazo-2-phenylacetic acid)-1,4-butanediol ester is 20％of the mass of PCL,the gel content of PCL is 61.1％.The crosslinked PCL presents good shape memory performance.The shape recovery rate is greater than 95％,and the shape fixing rate can reach 100％.
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