Nguyen Hung K, Inutsuka Manabu, Kawaguchi Daisuke, Tanaka Keiji
ACS Macro Lett. 2018 Oct 16;7(10):1198-1202. doi: 10.1021/acsmacrolett.8b00411. Epub 2018 Sep 17.
Sum-frequency generation spectroscopy was employed to follow the conformation evolution of polystyrene chains at the surface of a spin-coated film in a temperature-ramping mode as well as under isothermal annealing. The conformation of surface chains in an as-cast film was observed to be in a nonequilibrium state, in accordance with reported results for polymer chains in thin spin-coated films. While the relaxation of surface nonequilibrium chains was induced by the enhanced surface mobility, the whole chain motion such as reptation might be a key factor in determining the time scale for equilibrating the surface chain conformation.
采用和频振动光谱法，以升温模式以及等温退火方式跟踪旋涂膜表面聚苯乙烯链的构象演变。观察到，铸膜中表面链的构象处于非平衡态，这与关于旋涂薄膜中聚合物链的报道结果一致。虽然表面非平衡链的弛豫是由增强的表面迁移率引起的，但诸如链的蠕动等整个链的运动可能是决定表面链构象达到平衡的时间尺度的关键因素。
