Synthesis of urethane-modified aliphatic epoxyusing CO<sub>2</sub> for epoxy composites with tunable properties:Toughened polymer, elastomer, and pressure-sensitive adhesive
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내용
Herein, various epoxy composites, including a toughened polymer, elastomer, and pressure-sensitive adhesive (PSA), with tunable mechanical properties were prepared by adjusting the ratio of a rigid aromatic epoxy and flexible aliphatic epoxy. A flexible aliphatic epoxy that incorporated urethane linkages was used to extend the tuning range; it was synthesized via an eco-friendly route utilizing CO2 without isocyanate. The prepared toughened polymer-like and elastomeric epoxy composites can be used in structural epoxy adhesive and flexible electronics, respectively, as confirmed through single lap shear, cyclic tensile, and Izod impact tests. The most flexible among the prepared epoxy composites exhibited PSA properties that were comparable to those of conventional tapes. A viscoelastic window also supported that the prepared PSA can be utilized as a general-purpose PSA and a removable PSA.