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Phase Separation Induced by Shear Quenching in Polymer Blends With a Diblock Copolymer



H Jeon, Sangcheol Kim, Charles C. Han


The effects of adding A-B diblock copolymer to a polymer blend (A/B) on phase- separation kinetics and morphology have been investigated in a fixed shallow quench condition ({Δ}T = 1.5 C) by in-situ time-resolved light scattering and phase contrast optical microscopy. A shear-quench technique was used in this study instead of a conventional temperature-quench method. Mixtures of nearly monodisperse low relative molecular masses polybutadiene (Mw = 2.8 x kg/mol), polystyrene (Mw = 2.6 kg/mol), and a near-symmetric butadiene-styrene diblock copolymer (Mw = 6.3 kg/mol) as an interfacial modifier were studied. We observed that the addition of the diblock copolymer could either retard or accelerate the phase-separation kinetics depending on the concentration of the diblock copolymer in homopolymer blends. In contrast to the conventional temperature quench, we observed complex phase separation kinetics in the intermediate and late stages of phase separation by the shear-quench technique.
Journal of Polymer Science Part B-Polymer Physics
No. 8


block copolymer, phase separation, polybutadiene, polystyrene, shear quenched


Jeon, H. , Kim, S. and Han, C. (2001), Phase Separation Induced by Shear Quenching in Polymer Blends With a Diblock Copolymer, Journal of Polymer Science Part B-Polymer Physics, [online], (Accessed April 16, 2024)
Created April 1, 2001, Updated February 17, 2017