Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film
Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film
复制标题
聚对苯二甲酸乙二醇酯薄膜中的构象敏感表面动力学
DOI：
10.1021/acs.macromol.8b02284
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发表时间：
2019-03
期刊：
影响因子：
5.5
通讯作者：
Wang Xinping
中科院分区：
文献类型：
--
作者：
Xu Jianquan;Zhang Haosong;Li Jiachen;Zhang Li;Zuo Biao;Ophelia K. C. Tsui;Wang Xinping
通过调节相应的三氟乙酸（TFA）旋涂溶液中的水含量来调节聚对苯二甲酸乙二醇酯（PET）薄膜的表面平均构象，并通过表面敏感和频发生（SFG）振动光谱证实。分子动力学模拟结果表明，添加的水分子部分破坏了TFA分子与PET链之间的氢键网络，使得在PET薄膜形成过程中保留薄膜表面统计平均块状球形构象成为可能。当表面平均构象从定向扁椭球构象转变为各向同性球形构象时，观察到较慢的表面结晶动力学、较高的表面玻璃化转变温度（Tgsurface）和抑制的Tg限制效应，这表明表面动力学对链构象非常敏感。
The surface average conformation of poly(ethylene terephthalate) (PET) films was modulated by adjusting the water content in corresponding trifluoroacetic acid (TFA) spin-coating solutions, which was confirmed by surface-sensitive sum frequency generation (SFG) vibrational spectroscopy. Molecular dynamics simulation results showed that the added water molecules partly disrupt the hydrogen bond network between TFA molecules and PET chains and make it possible to preserve the statistical average bulk-like spherical conformation at the film surface during the formation of PET film. Slower surface crystallization kinetics, higher surface glass transition temperature (Tgsurface), and suppressed Tg-confinement effect were observed when the surface average conformation changed from oriented oblate ellipsoidal conformation to isotropic spherical conformation, showing that surface dynamics is very sensitive to chain conformation.
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