Shear induced structures in lamellar phases of amphiphilic block copolymers

Johannes Zipfel; Jörg Berghausen; Gudrun Schmidt; Peter Lindner; Paschalis Alexandridis; Marina Tsianou; Walter Richtering

doi:10.1039/a904014e

Shear induced structures in lamellar phases of amphiphilic block copolymers

Johannes Zipfel
, Jörg Berghausen
, Gudrun Schmidt
, Peter Lindner
, Paschalis Alexandridis
, Marina Tsianou
, Walter Richtering

Department of Chemical and Biological Engineering

University of Freiburg
Institut Laue-Langevin

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

74 Scopus citations

Abstract

The influence of shear on the mesoscopic structure in the lamellar region of ternary poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) block copolymers PEO₂₀-b-PPO₇₀-b-PEO₂₀ and PEO₁₀₀-bPPO₇₀-b-PEO₁₀₀ (Pluronic P123 and F127)/water/butanol systems was investigated by different techniques namely: small angle neutron and light scattering (SANS, SALS), as well as birefringence. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. However, a shear-induced formation of multilamellar vesicles ('onions') was observed when the polymer concentration was reduced.

Original language	English
Pages (from-to)	3905-3910
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	1
Issue number	17
DOIs	https://doi.org/10.1039/a904014e
State	Published - Sep 1 1999

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title = "Shear induced structures in lamellar phases of amphiphilic block copolymers",

abstract = "The influence of shear on the mesoscopic structure in the lamellar region of ternary poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) block copolymers PEO20-b-PPO70-b-PEO20 and PEO100-bPPO70-b-PEO100 (Pluronic P123 and F127)/water/butanol systems was investigated by different techniques namely: small angle neutron and light scattering (SANS, SALS), as well as birefringence. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. However, a shear-induced formation of multilamellar vesicles ('onions') was observed when the polymer concentration was reduced.",

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T1 - Shear induced structures in lamellar phases of amphiphilic block copolymers

AU - Zipfel, Johannes

AU - Berghausen, Jörg

AU - Schmidt, Gudrun

AU - Lindner, Peter

AU - Alexandridis, Paschalis

AU - Tsianou, Marina

AU - Richtering, Walter

PY - 1999/9/1

Y1 - 1999/9/1

N2 - The influence of shear on the mesoscopic structure in the lamellar region of ternary poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) block copolymers PEO20-b-PPO70-b-PEO20 and PEO100-bPPO70-b-PEO100 (Pluronic P123 and F127)/water/butanol systems was investigated by different techniques namely: small angle neutron and light scattering (SANS, SALS), as well as birefringence. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. However, a shear-induced formation of multilamellar vesicles ('onions') was observed when the polymer concentration was reduced.

AB - The influence of shear on the mesoscopic structure in the lamellar region of ternary poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) block copolymers PEO20-b-PPO70-b-PEO20 and PEO100-bPPO70-b-PEO100 (Pluronic P123 and F127)/water/butanol systems was investigated by different techniques namely: small angle neutron and light scattering (SANS, SALS), as well as birefringence. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. However, a shear-induced formation of multilamellar vesicles ('onions') was observed when the polymer concentration was reduced.

UR - https://www.scopus.com/pages/publications/0033199179

U2 - 10.1039/a904014e

DO - 10.1039/a904014e

M3 - Article

AN - SCOPUS:0033199179

SN - 1463-9076

VL - 1

SP - 3905

EP - 3910

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 17

ER -

Shear induced structures in lamellar phases of amphiphilic block copolymers

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