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Title: In-situ small-angle neutron scattering from a block copolymer solution under shear

Abstract

Small-angle neutron scattering profiles from a concentrated (65 wt%) polystyrene-polyisoprene block copolymer solution in dioctyl phthalate under shear were obtained both above and below the quiescent order--disorder transition (ODT). The ordered solution has a lamellar structure under quiescent conditions. The shear-induced structure was inferred from scattering measurements in two planes: the v-vx[del]v plane and the [del]v-vx[del]v plane (v is the fluid velocity direction and [del]v is the velocity gradient direction). Below the quiescent ODT, oscillatory shear produces lamellae that are aligned along the shearing surface, while steady shear results in a reorientation of the lamellae normals from the v-vx[del]v plane to the [del]v-vx[del]v plane. Above the quiescent ODT, steady shear induces order above a critical shear rate. The resulting scattering anisotropy obtained at different temperatures obeys a universal scaling law, and the critical shear rate increases exponentially with temperature.

Authors:
; ;  [1];  [2];  [3]
  1. Polytechnic Univ., Brooklyn, NY (United States). Dept. of Chemical Engineering
  2. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
  3. National Inst. of Standards and Technology, Boulder, CO (United States)
Publication Date:
OSTI Identifier:
7037032
Resource Type:
Journal Article
Journal Name:
Macromolecules; (United States)
Additional Journal Information:
Journal Volume: 27:9; Journal ID: ISSN 0024-9297
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPOLYMERS; MORPHOLOGY; SHEAR PROPERTIES; MATHEMATICAL MODELS; ORDER-DISORDER TRANSFORMATIONS; RHEOLOGY; MECHANICAL PROPERTIES; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PHASE TRANSFORMATIONS; POLYMERS; 360603* - Materials- Properties; 360602 - Other Materials- Structure & Phase Studies

Citation Formats

Balsara, N P, Kesani, P K, Jonnalagadda, S V, Hammouda, B, and Straty, G C. In-situ small-angle neutron scattering from a block copolymer solution under shear. United States: N. p., 1994. Web. doi:10.1021/ma00087a027.
Balsara, N P, Kesani, P K, Jonnalagadda, S V, Hammouda, B, & Straty, G C. In-situ small-angle neutron scattering from a block copolymer solution under shear. United States. https://doi.org/10.1021/ma00087a027
Balsara, N P, Kesani, P K, Jonnalagadda, S V, Hammouda, B, and Straty, G C. 1994. "In-situ small-angle neutron scattering from a block copolymer solution under shear". United States. https://doi.org/10.1021/ma00087a027.
@article{osti_7037032,
title = {In-situ small-angle neutron scattering from a block copolymer solution under shear},
author = {Balsara, N P and Kesani, P K and Jonnalagadda, S V and Hammouda, B and Straty, G C},
abstractNote = {Small-angle neutron scattering profiles from a concentrated (65 wt%) polystyrene-polyisoprene block copolymer solution in dioctyl phthalate under shear were obtained both above and below the quiescent order--disorder transition (ODT). The ordered solution has a lamellar structure under quiescent conditions. The shear-induced structure was inferred from scattering measurements in two planes: the v-vx[del]v plane and the [del]v-vx[del]v plane (v is the fluid velocity direction and [del]v is the velocity gradient direction). Below the quiescent ODT, oscillatory shear produces lamellae that are aligned along the shearing surface, while steady shear results in a reorientation of the lamellae normals from the v-vx[del]v plane to the [del]v-vx[del]v plane. Above the quiescent ODT, steady shear induces order above a critical shear rate. The resulting scattering anisotropy obtained at different temperatures obeys a universal scaling law, and the critical shear rate increases exponentially with temperature.},
doi = {10.1021/ma00087a027},
url = {https://www.osti.gov/biblio/7037032}, journal = {Macromolecules; (United States)},
issn = {0024-9297},
number = ,
volume = 27:9,
place = {United States},
year = {1994},
month = {4}
}