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Effect of shear on poly(styrene-b-isoprene)copolymer micelles
방준하,Timothy P. Lodge 한국유변학회 2007 Korea-Australia rheology journal Vol.19 No.4
The use of various shearing apparatuses to study the phase behavior of poly(styrene-b-isoprene) diblockcopolymer micelles is described. A DMTA rheometer was modified so that one can apply oscillatory shearand obtain the scattering pattern along the shear gradient direction. A cone and plate shear cell was designedto access scattering along the shear vorticity direction, and both oscillatory and steady shear can be applied.because a high shear rate can be readily achieved without disturbing the sample by overflow. In this work,oscillatory shear was used to obtain a single crystal-like scattering pattern, and thereby to examine themechanism of the thermotropic transition between face-centered cubic (fcc) and body-centered cubic (bcc)lattices. By applying the steady shear, the response of the fcc lattices to various shear rates is discussed.