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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of Tethering Probes on the Rotational Dynamics of a Polymer near the Glass Transition

2019년 9월 9일 11시 56분 27초
PHYS.P-228 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Physical Chemistry
저자 및
Jiwon Choi, Soohyun Lee, Keewook Paeng*
Department of Chemistry, Sungkyunkwan University, Korea
The segmental dynamics of polymer, which is the relevant dynamics of the glass transition, can be probed by analyzing the rotation of the fluorescent molecules in polymer matrices via imaging rotational fluorescence correlation microscopy. Although tethered probes have broad applicability, only the rotational dynamics of untethered probes has been studied. Therefore, we tethered probes to polymer by changing the length of the flexible linkers and the number of tethering points. The rotational dynamics of tethered probes was found to be slower than freely rotating probes due to the restricted motion by linkers, but the temperature dependence of polymer dynamics and the shape of the correlation decay were not changed. In case of the bigger size of untethered probe, rotational dynamics was slower than smaller probes as tethered probes, but its mechanism is different : probe averaged over different regions of the dynamics heterogeneity. As a result, if the size of the probes was corresponding to that of the dynamics heterogeneity of the host system, tethered probes exactly report dynamics related to glass transition, regardless of tethering conditions.