Observation of constraint surface dynamics of polystyrene thin films by functionalization of a silsesquioxane cage

POLYMER

卷:105

Article

Hoshino, Taiki^1,2  Nojima, Shiki^1,3  Sato, Masanao³  Hirai, Tomoyasu^1,3,4,5  Higaki, Yuji^1,3,4,5,6  Fujinami, So¹  Murakami, Daiki^4,6  Ogawa, Shigesaburo⁶  Jinnai, Hiroshi^6,7  Takahara, Atsushi^1,3,4,5,6  Takata, Masaki^1,7 

[1] RIKEN, SPring Ctr 8, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan

[2] Tokyo Inst Technol, JST PRESTO, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268502, Japan

[3] Kyushu Univ, Grad Sch Engn, Fukuoka 812, Japan

[4] Kyushu Univ, Inst Mat Chem & Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[6] Kyushu Univ, JST, ERATO Takahara Soft Interfaces Project, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[7] Tohoku Univ, IMRAM, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

关键词: Capillary wave;    Polymer thin film;    X-ray photon correlation spectroscopy;   

DOI  :  10.1016/j.polymer.2016.08.040

来源: Elsevier

【 摘 要 】

The surface dynamics of polyhedral oligomeric silsesquioxane (POSS)-functionalized polystyrene (PS-POSS) thin films above the glass transition temperature were studied by grazing-incidence X-ray photon correlation spectroscopy in order to elucidate the effects of POSS at the end of the polystyrene chains. Much slower fluctuations were observed in the surface of PS-POSS thin films than in the polystyrene thin films, despite the negligible difference in their bulk viscosity. Quantitative analysis based on fluctuation-dissipation theorem indicated that there is a high-viscosity layer at the surface of the PS-POSS films, and that the substrate interface originated from POSS segregation. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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