S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Effect of Shear Flow on the Polymeric Gels Formed by Macroscopic Phase Separation
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- Issue Date
- John Wiley & Sons
- Macromol. Rapid Commun. 2004, 25, 1082-1089
- gels ; memory effect ; PEO-PLGA-PEO ; shear
- 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.
- 1022-1336 (print)
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