ENTROPY-DRIVEN SURFACE SEGREGATION IN BLOCK COPOLYMER MELTS

被引：108

作者：

SIKKA, M ^{[1
]}

SINGH, N ^{[1
]}

KARIM, A ^{[1
]}

BATES, FS ^{[1
]}

SATIJA, SK ^{[1
]}

MAJKRZAK, CF ^{[1
]}

机构：

[1] NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.70.307

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Surface segregation in thin films of symmetric polyolefin diblock copolymers containing a lamellar microstructure, cast on a variety of substrates, has been investigated. In all cases, the conformationally smaller block preferentially segregated to both the solid and air interfaces even though the surface energy of the solid substrate always exceeded that of the block copolymer. These results indicate an entropically driven surface segregation effect that we attribute to block conformational asymmetry.

引用

收藏

页码：307 / 310

页数：4

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