本研究利用熱的方式調控熱固性高分子之相變化(玻璃轉換),使其切換力學材料至阻尼材料兩種極端的材料特性。加熱的來源選擇精準且方便外在調控的歐姆熱,可由加入奈米碳管改質熱固性高分子使其具有導電性並在施加電壓後產生熱能。實驗結果顯示,所使用之奈米碳管/環氧樹脂複合材料在室溫呈現約30%的能量吸收比,在加溫至80oC後可達到約90%之能量吸收比,並具均勻性與可逆性。主要可應用在突發振動發生時之結構制震系統設計,以及改進現有相關制震裝置(例如:制震壁)的效能。最後在其他機械性質如硬度、楊氏模數對溫度變化的量測中,探討相變化對機械性質的影響,並決定了此元件的可能應用工作溫度範圍。
A rigidity controllable material is designed by applying the thermo-induced phase transition (glass transition) of a thermo-setting polymer. This transition of a conductive MWNT/epoxy composite took place due to associated ohmic heat once a voltage was applied. Energy absorption percentage of an external impact changes from about 30% to 90% at room temperature and 80oC respectively, revealing that the originally rigid matrix is able to turn into a damping material rapidly when needed. Other mechanical properties such as hardness, Young’s modulus were also measured with varied temperature to understand the mechanism.