SHERP

Effect of Shear Flow on the Polymeric Gels Formed by Macroscopic Phase Separation

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Authors
Park, Moon Jeong; Char, Kookheon
Issue Date
2004-05-24
Publisher
John Wiley & Sons
Citation
Macromol. Rapid Commun. 2004, 25, 1082-1089
Keywords
gelsmemory effectPEO-PLGA-PEOshear
Abstract
Summary: Shear-induced phase behavior of poly(ethylene oxide-b-(DL-lactic acid-co-glycolic acid)-b-ethylene oxide) (PEO-PLGA-PEO) triblock copolymers in water is investigated using rheology and small-angle neutron scattering equipped with an in situ Couette shear cell. For gels formed by the macroscopic phase separation, the steady shear experiment reveals that the flow-induced anisotropy on a nanometer length scale at a critical shear rate and the phase separation on a larger length scale are successively induced with a further increase in the shear rate. In particular, the hard gels show a memory effect inscribed by a pre-high shear in contrast to the soft gels.
ISSN
1022-1336 (print)
1521-3927 (online)
Language
English
URI
http://hdl.handle.net/10371/5845
DOI
https://doi.org/10.1002/marc.200400042
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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