A Transition from Cylindrical to Spherical Morphology in Diblock Copolymer Thin Films

被引：30

作者：

Niihara, Ken-ichi ^{[1
]}

Sugimori, Hidekazu ^{[1
]}

Matsuwaki, Ukyo ^{[1
]}

Hirato, Fumio ^{[1
]}

Morita, Hiroshi ^{[2
]}

Doi, Masao ^{[3
]}

Masunaga, Hiroyasu ^{[4
]}

Sasaki, Sono ^{[4
]}

Jinnai, Hiroshi ^{[1
]}

机构：

[1] Kyoto Inst Technol, Grad Sch Sci & Engn, Dept Macromol Sci & Engn, Kyoto 6068585, Japan

[2] Natl Inst Adv Ind Sci & Technol, Nanotechnol Res Inst, Nanosimulat Res Grp, Tsukuba, Ibaraki 3058568, Japan

[3] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[4] Japan Synchrotoron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

来源：

MACROMOLECULES | 2008年 / 41卷 / 23期

关键词：

D O I：

10.1021/ma801892p

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Microphase-separated structures in poly(styrene-block-isoprene) (SI) block copolymer thin films were investigated by transmission electron microtomography (TEMT). The SI block copolymer showed cylindrical microdomains in the bulk state. Several block copolymer thin films with different thicknesses were prepared by spin-coating and were extensively annealed before the TEMT experiments. Intriguingly, although the cylindrical morphology orienting parallel to the substrate was observed in most of the cases, spherical microdomains were found at certain film thicknesses. The thickness dependence was investigated using a computer simulation based on the self-consistent-field theory, producing a morphological phase diagram based on minimizing free energy. We find that the distortion of the hexagonal lattice of the cylindrical microdomains caused the morphological transition to the spherical microdomains.

引用

页码：9318 / 9325

页数：8

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