Melt-induced transition in thickness and interfacial molecular orientation of poly(ethylene oxide) thin films

被引：1

作者：

Inutsuka, Manabu ^{[1
,3
]}

Watanabe, Hirohmi ^{[1
]}

Aoyagi, Masaru ^{[1
]}

Maruyama, Yusuke ^{[2
]}

Satou, Taiki ^{[2
]}

Ikehara, Takayuki ^{[2
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Sustainable Chem, Organ Mat Diag Grp, 3-11-32 Kagamiyama, Higashihiroshima 7390046, Japan

[2] Kanagawa Univ, Fac Engn, Dept Mat & Life Chem, 3-27-1 Rokkakubashi,Kanagawa Ku, Yokohama 2218686, Japan

[3] Waseda Univ, Waseda Ctr Carbon Neutral Soc, 3-4-1 Okubo,Shinju Ku, Tokyo 1698555, Japan

来源：

POLYMER | 2023年 / 287卷

关键词：

Thin film; Interface; Crystalline polymer; ULTRATHIN FILMS; CHAIN ORGANIZATION; POLYSTYRENE FILMS; CRYSTAL-GROWTH; CRYSTALLIZATION; SURFACE; TEMPERATURE; DEPENDENCE; DYNAMICS;

D O I：

10.1016/j.polymer.2023.126416

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Melting behavior of poly(ethylene oxide) (PEO) in thin films was examined by observing the variations of thickness (Delta d) and interfacial molecular orientation using ellipsometry and sum-frequency generation (SFG) spectroscopy, respectively. The thinner PEO films exhibited a smaller ratio of Delta d to the film thickness on melting, indicating a lower degree of crystallinity (chi). For the as-cast films, this thinning effect was more evident on hydrophilic substrates than on hydrophobic substrates. For the annealed films, the thinning effect was less dependent on the substrates. These results imply that the decrease in the chi of PEO with decreasing thickness originates from two factors: reduced chain dynamics at the substrate interface and crystallization confined to a limited space, which are dominant for the as-cast and annealed films, respectively. The SFG measurements detected characteristic signals originating from crystallized PEO at the air/PEO and PEO/substrate interfaces.

引用

页数：6

共 48 条

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