对称三元嵌段共聚物 - 均聚物共混物在薄膜和化学图案化表面上的相行为。

Phase behavior of symmetric ternary block copolymer-homopolymer blends in thin films and on chemically patterned surfaces.

作者信息

Stoykovich Mark P, Edwards Erik W, Solak Harun H, Nealey Paul F

机构信息

Department of Chemical and Biological Engineering and Center for Nanotechnology, University of Wisconsin, Madison, Wisconsin 53706, USA.

出版信息

Phys Rev Lett. 2006 Oct 6;97(14):147802. doi: 10.1103/PhysRevLett.97.147802.

DOI:10.1103/PhysRevLett.97.147802

PMID:17155291

Abstract

The phase diagram of symmetric ternary blends of diblock copolymers and homopolymers in thin films was determined as a function of increasing volume fraction of homopolymer (phi(H)) and was similar to that for these materials in the bulk. Blends with compositions in the lamellar region of the diagram (phi(H)< or =0.4) could be directed to assemble into ordered lamellar arrays on chemically striped surfaces if the characteristic blend dimension (L(B)) and the period of the stripes (L(S)) were commensurate such that L(S)=L(B)+/-0.10L(B). Blends with compositions in the microemulsion region of the diagram (phi(H) approximately 0.6) assembled into defect-free lamellar phases on patterned surfaces with L(S)> or =L(B), but formed coexisting lamellar (with period L(S)) and homopolymer-rich phases when L(S)<L(B).

摘要

测定了薄膜中双嵌段共聚物和均聚物对称三元共混物的相图，该相图是均聚物体积分数（φ(H)）增加的函数，并且与这些材料在本体中的相图相似。如果特征共混物尺寸（L(B)）和条纹周期（L(S)）是相称的，即L(S)=L(B)±0.10L(B)，那么在相图层状区域（φ(H)≤0.4）具有特定组成的共混物可以在化学条纹表面上定向组装成有序的层状阵列。在相图微乳液区域（φ(H)约为0.6）具有特定组成的共混物，当L(S)≥L(B)时在图案化表面上组装成无缺陷的层状相，但当L(S)<L(B)时会形成共存的层状相（周期为L(S)）和富含均聚物的相。