Investigation of phase separation in multiblock copolymers consisting of polysulfone and a liquid crystalline polymer |
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Authors: | Antje Gottwald Dieter Jehnichen Doris Pospiech Peter Friedel Andreas Janke |
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Institution: | Institute of Polymer Research Dresden Hohe , Str. 6, 01069, Dresden, Germany |
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Abstract: | Multiblock copolymers (MBCPs) consisting of polysulfone (PSU) segments and segments of the liquid crystalline poly(ethyleneterephthalate-co-oxybenzoate) (PET/HBA) form rather complex morphologies. Scanning electron microscopy (SEM), small-angle X-ray scattering (SAXS), and atomic force microscopy (AFM) investigations of two block copolymers with significantly different block molecular weights proved the existence of both macro-and microphase separation. These morphologies, existing on different length scales, were found to be superimposed in the samples. A suitable fractionation procedure was used to suppress macrophase separation. Then, it was found that microphase separation is controlled by the segment molecular weights. |
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Keywords: | Liquid crystalline polymer Macrophase separation Microphase separation Morphology Multiblock copolymers Polysulfone Segmented block copolymers |
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