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 journalArticlepeer-review

23 Citations (Scopus)


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).

Original languageEnglish
Pages (from-to)8083-8090
Number of pages8
Issue number23
Publication statusPublished - Nov 17 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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