Effects of Crosslink Density on Photomechanical Jumping of Glassy Liquid Crystalline Polymer Networks
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초록
내용
In nature, jumping is a key survival strategy for living animals as it allows them to rapidly navigate through rough terrains and overcome obstacles that are often several times their body size. In our previous report, we newly demonstrated a UV-induced photo-mechanical jumping of polymer monolith by introducing snap-through buckling of azobenzene functionalized liquid crystal polymer networks (azo-LCNs). However, the long-term UV irradiation of high intensity required for high jumping has raised concerns over the possible bond breakage and the subsequent decrease in the jumping capacity. Herein, we control the duration of UV irradiation for photopolymerization to vary the crosslink density and investigate the effect of the structure-property relationship on mild-condition jumping. Remarkably, a maximum jumping height of 15.9 mm is reached at a milder light intensity of 0.1 W cm-2, which is a 214% increase in height compared to the previous result obtained at identical UV light conditions.