Small Angle X-Ray Scattering Study of Micro- and Macro-Phase Separations in Blends of Block Copolymer with Homopolymer.
CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND ENGINEERING
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The order-disorder phase transition behavior exhibited by blends of a styrene-butadiene diblock copolymer 76 styrene with a polystyrene of various molecular weight from 2,200 to 50,000 is studied by means of small-angle X-ray scattering. With a polystyrene of a relatively short chain length the blend, on lowering the temperature, undergoes a microphase separation, and the scattering curve shows a peak at a finite scattering angle. With a polystyrene of relatively long chain length, the scattered intensity curve shows additional low angle component with intensity increasing rapidly as q approaches 0, and this is interpreted in terms o the microphase separation accompanying the transition from the disordered to ordered phase.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy