Analysis of force transferring mechanism depending on crosslinking density via spiropyran molecular sensor in PMMA, the glassy polymer system
발표자
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초록
내용
Although researches have been conducted for decades in order to grasp force transfer inside polymer, there still exist many difficulties in quantitatively understanding its mechanism. Recently, a novel method has been proposed to activate spiropyran(SP) molecules by force, not by UV nor heat. When a force is applied to polymer where SP is chemically incorporated, it is transferred to the SP molecule through polymer chain, resulting in SP activation into a merocyanine (MC) form. In this study, we have investigated the force transmission to polymer chain via SP molecular force sensor located at crosslink. The crosslinking density was controlled by adding the other cross-linker, EGDMA, such that the mechanism of the force transfer would be analyzed based on crosslinking. Interestingly, as crosslinking density increased, the force on polymer itself went up while the force transferred to the crosslink was decreased.