Lamellar orientation of diblock copolymer solutions under steady shear flow

Shinichi Kitade; Nobuo Ochiai; Yoshiaki Takahashi; Ichiro Noda; Yushu Matsushita; Alamgir Karim; Alan I. Nakatani; Hongdoo Kim; Charles C. Han

doi:10.1021/ma971470p

Lamellar orientation of diblock copolymer solutions under steady shear flow

Shinichi Kitade, Nobuo Ochiai, Yoshiaki Takahashi, Ichiro Noda, Yushu Matsushita, Alamgir Karim, Alan I. Nakatani, Hongdoo Kim, Charles C. Han

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

The steady shear rate dependence of the structure of two poly(styrene-d₈-b-2-vinylpyridine)s in α-chloronaphthalene, a common good solvent, was measured by small-angle neutron scattering (SANS) in a couette flow cell geometry in the ordered state, in which the solutions assume a lamellar structure (randomly oriented grains). SANS measurements revealed that steady shear flow induces macroscopic lamellar orientation at certain characteristic shear rates for the higher molecular weight sample (M_w = 3.6 × 10⁵). Lamellar normals are preferentially oriented along the vorticity direction at high shear rates. However, no shear effect was observed for the low molecular weight sample (M_w = 2.0 × 10⁵).

Original language	English
Pages (from-to)	8083-8090
Number of pages	8
Journal	Macromolecules
Volume	31
Issue number	23
DOIs	https://doi.org/10.1021/ma971470p
Publication status	Published - Nov 17 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma971470p

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title = "Lamellar orientation of diblock copolymer solutions under steady shear flow",

abstract = "The steady shear rate dependence of the structure of two poly(styrene-d8-b-2-vinylpyridine)s in α-chloronaphthalene, a common good solvent, was measured by small-angle neutron scattering (SANS) in a couette flow cell geometry in the ordered state, in which the solutions assume a lamellar structure (randomly oriented grains). SANS measurements revealed that steady shear flow induces macroscopic lamellar orientation at certain characteristic shear rates for the higher molecular weight sample (Mw = 3.6 × 105). Lamellar normals are preferentially oriented along the vorticity direction at high shear rates. However, no shear effect was observed for the low molecular weight sample (Mw = 2.0 × 105).",

author = "Shinichi Kitade and Nobuo Ochiai and Yoshiaki Takahashi and Ichiro Noda and Yushu Matsushita and Alamgir Karim and Nakatani, {Alan I.} and Hongdoo Kim and Han, {Charles C.}",

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T1 - Lamellar orientation of diblock copolymer solutions under steady shear flow

AU - Kitade, Shinichi

AU - Ochiai, Nobuo

AU - Takahashi, Yoshiaki

AU - Noda, Ichiro

AU - Matsushita, Yushu

AU - Karim, Alamgir

AU - Nakatani, Alan I.

AU - Kim, Hongdoo

AU - Han, Charles C.

PY - 1998/11/17

Y1 - 1998/11/17

N2 - The steady shear rate dependence of the structure of two poly(styrene-d8-b-2-vinylpyridine)s in α-chloronaphthalene, a common good solvent, was measured by small-angle neutron scattering (SANS) in a couette flow cell geometry in the ordered state, in which the solutions assume a lamellar structure (randomly oriented grains). SANS measurements revealed that steady shear flow induces macroscopic lamellar orientation at certain characteristic shear rates for the higher molecular weight sample (Mw = 3.6 × 105). Lamellar normals are preferentially oriented along the vorticity direction at high shear rates. However, no shear effect was observed for the low molecular weight sample (Mw = 2.0 × 105).

AB - The steady shear rate dependence of the structure of two poly(styrene-d8-b-2-vinylpyridine)s in α-chloronaphthalene, a common good solvent, was measured by small-angle neutron scattering (SANS) in a couette flow cell geometry in the ordered state, in which the solutions assume a lamellar structure (randomly oriented grains). SANS measurements revealed that steady shear flow induces macroscopic lamellar orientation at certain characteristic shear rates for the higher molecular weight sample (Mw = 3.6 × 105). Lamellar normals are preferentially oriented along the vorticity direction at high shear rates. However, no shear effect was observed for the low molecular weight sample (Mw = 2.0 × 105).

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JO - Macromolecules

JF - Macromolecules

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ER -

Lamellar orientation of diblock copolymer solutions under steady shear flow

Abstract

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