Abstract：The phase separation kinetics of polystyrene／poly(vinyl methyl ether)(PS／PVME)blends under
oscillatory shear was studied on a customized Rheo-SALS tester．It was found that,under fixed frequency and strain amplitude,the phase separation exhibited anisotropy and periodicity．At a given phase angle,the early—stage kinetics of phase separation followed the classical Cabn-Hilliard theory．The average of characteristic wavenumber qm,where the maximum scattering locates,stayed unchanged during the phase separation,implying that only the composition fluctuations with specific size will be favored under a oscillatory shear with given frequency and strain amplitude．Under shear,qxm, the characteristic wavenumber along flow direction,experienced a compulsive oscillation with a frequency same as that of shear,while qzmthe characteristic wavenumher along vorticity direction,dose not．Through simultaneous rheological measurements,it was also found that stress could appropriately reflect the stage of phase separation．For example,the first normal stress difference reached maximum when the early stage of phase separation ended.
罗勇;欧阳文斌;杨其;李光宪. 振荡剪切场下PS/PVME共混物的相分离动力学研究——相分离的依时性及应力响应[J]. Acta Polymerica Sinica, 2006, (4): 557-563.
LUO Yong;OUYANG Wenbin;YANG Qi;LI Guangxian. STUDY ON THE PHASE SEPARATION KINETICS OF PS/PVME BLENDS UNDER OSCILLATORY SHEAR——THE TIME DEPENDENCE AND STRESS RESPONSE OF PHASE SEPARATION. Acta Polymerica Sinica, 2006, (4): 557-563.