Shear-induced micellar crystal structures in an aqueous triblock copolymer solution

被引：23

作者：

Slawecki, TM ^{[1
]}

Glinka, CJ ^{[1
]}

Hammouda, B ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW E | 1998年 / 58卷 / 04期

关键词：

D O I：

10.1103/PhysRevE.58.R4084

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Shear-induced structures have been observed in aqueous solutions of the triblock copolymer PEO25PPO40PEO25 in the micellar crystalline region of the temperature-concentration phase diagram. A structure induced by steady shear, having two-dimensional (2D) hexagonal symmetry over macroscopic dimensions, transforms reversibly to a crystalline structure with different symmetry upon cessation of shear. Other structures are induced with oscillatory shear, including a 3D hexagonal phase with Bragg peaks that not only persist but sharpen with the cessation of shear. Over the range of temperature, concentration, and shear conditions investigated, no evidence for cubic or cubatic crystalline phases has been observed. [S1063-651X(98)50110-9].

引用

页码：R4084 / R4087

页数：4

共 16 条

[11] INVERSE MELTING TRANSITION AND EVIDENCE OF 3-DIMENSIONAL CUBATIC STRUCTURE IN A BLOCK-COPOLYMER MICELLAR SYSTEM [J].

MORTENSEN, K ;

BROWN, W ;

NORDEN, B .

PHYSICAL REVIEW LETTERS, 1992, 68 (15) :2340-2343

[12] Microstructure-dependent viscosity in concentrated suspensions of soft spheres [J].

Paulin, SE ;

Ackerson, BJ ;

Wolfe, MS .

PHYSICAL REVIEW E, 1997, 55 (05) :5812-5819

[13] Scattering form factor of block copolymer micelles [J].

Pedersen, JS ;

Gerstenberg, MC .

MACROMOLECULES, 1996, 29 (04) :1363-1365

[14] Structure and rheology studies of poly(oxyethylene-oxypropylene-oxyethylene) aqueous solution [J].

Prudhomme, RK ;

Wu, GW ;

Schneider, DK .

LANGMUIR, 1996, 12 (20) :4651-4659

[15] On the nature of the perforated layer phase in undiluted diblock copolymers [J].

Qi, SY ;

Wang, ZG .

MACROMOLECULES, 1997, 30 (15) :4491-4497

[16] PHASE-DIAGRAMS AND AGGREGATION BEHAVIOR OF POLY(OXYETHYLENE)-POLY(OXYPROPYLENE)-POLY(OXYETHYLENE) TRIBLOCK COPOLYMERS IN AQUEOUS-SOLUTIONS [J].

WANKA, G ;

HOFFMANN, H ;

ULBRICHT, W .

MACROMOLECULES, 1994, 27 (15) :4145-4159

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