A New Thermally Re-Mendable and Recyclable Epoxy Thermoset Based on Siloxane Equilibration

摘要

A new thermally re-mendable and recyclable epoxy thermoset was developedfrom diglycidyl ether of ethoxylated bisphenol-A (DGEBAEO) and bis (potassium)oligoaminopropylmethylsiloxanediolate (K-PAMS). The DGEBAEO/K-PAMSsystem was a highly crosslinked thermoset with Tg of 75 °C and elastic modulus about2.2Gpa (Figure 1). K-PAMS contained active potassium aminopropylmethylsilanolateend groups that can catalyze the siloxane equilibration to restructure the crosslinknetwork, enabling the fractured thermoset to be self-healed and the pulverizedthermoset grains to be reprocessed like thermoplastics under elevated temperature(about 110 °C) (Figure 2). The healing efficiency of tensile strength achieved 80%after 24 h healing and the recyclable specimen showed fully recovery in storagemodulus.