Morphology Transitions of Linear A1B1A2B2 Tetrablock Copolymers at Symmetric Overall Volume Fraction

被引：31

作者：

Ahn, Seonghyeon ^{[1
]}

Kim, Jin Kon ^{[1
]}

Zhao, Bin ^{[2
]}

Duan, Chao ^{[2
]}

Li, Weihua ^{[2
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Chem Engn, Natl Creat Res Initiat Ctr Smart Block Copolymers, Pohang 790784, Kyungbuk, South Korea

[2] Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China

来源：

MACROMOLECULES | 2018年 / 51卷 / 11期

基金：

新加坡国家研究基金会; 中国国家自然科学基金;

关键词：

ABC TRIBLOCK TERPOLYMER; BLOCK-COPOLYMERS; BINARY BLENDS; PHASE-BEHAVIOR; PARAMETER SPACE; LAMELLAR MICRODOMAINS; DIBLOCK COPOLYMERS; GYROID STRUCTURES; TEMPERATURE; MIXTURES;

D O I：

10.1021/acs.macromol.8b00567

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We investigated morphology transitions of linear tetrablock copolymers of polystyrene-block-polyisoprene-block-polystyrene-block-polyisoprene (S1I1S2I2) by varying volume fraction of PI1 block (f(PI1)), while maintaining the symmetric volume fraction of total PS blocks and PI blocks (f(PS1)+f(PS2):f(PI1)+f(PI2) approximate to 1:1). An interesting sequence of morphology transitions was observed as fPI1 was increased: lamellae (L) -> asymmetric lamellae (aL) -> hexagonally packed PI-cylinders (CPI) -> double gyroid with PI-network domains (GPI) -> short-period lamellae (sL). The domain spacing of sL was nearly half that of L, while aL had asymmetric lamellar width of PS and PI microdomains. It is particularly interesting that cylindrical and gyroid morphologies were observed in linear block copolymers with symmetric overall volume fraction at intermediate segregation. The experimentally observed morphologies are in good agreement with the predicted equilibrium phases by self-consistent field theory (SCFT).

引用

页码：4415 / 4421

页数：7

共 43 条

[1] Influence of molecular architecture on morphology and micromechanical behavior of styrene/butadiene block copolymer systems [J].