Probing Glass Transitions in Thin and Ultrathin Polystyrene Films by Stick鈥揝lip Behavior during Dynamic Wetting of Liquid Droplets on Their Surfaces

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• 作者：Biao Zuo ; Chao Qian ; Donghuan Yan ; Yingjun Liu ; Wanglong Liu ; Hao Fan ; Houkuan Tian ; Xinping Wang
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：March 12, 2013
• 年：2013
• 卷：46
• 期：5
• 页码：1875-1882
• 全文大小：388K
• 年卷期：v.46,no.5(March 12, 2013)
• ISSN：1520-5835

文摘

A novel method was developed to detect the glass transition of thin and ultrathin polystyrene (PS) films by correlating the relationships between the temperature-dependent viscoelasticity of the PS films and stick鈥搒lip behavior on their surfaces during dynamic wetting of glycerol or oligo-poly(ethylene glycol) droplets. The peak temperature (T_jm) obtained from the jumping angle鈥揻ilm temperature curve, in which the jumping angle 螖胃 was employed to scale the stick鈥搒lip behavior, was nearly identical to the corresponding T_g (or T_伪) of the PS film. This was confirmed by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The change of the measured T_jm with film thickness and substrate chemistry (SiO₂鈥揝i and H鈥揝i) further confirmed that the developed method is very sensitive for detecting the dynamics of ultrathin polymer films.