Investigation of phase separation in multiblock copolymers consisting of polysulfone and a liquid crystalline polymer
作者:
Antje Gottwald,
Dieter Jehnichen,
Doris Pospiech,
Peter Friedel,
Andreas Janke,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1999)
卷期:
Volume 38,
issue 5-6
页码: 549-562
ISSN:0022-2348
年代: 1999
DOI:10.1080/00222349908248120
出版商: Taylor & Francis Group
关键词: Liquid crystalline polymer;Macrophase separation;Microphase separation;Morphology;Multiblock copolymers;Polysulfone;Segmented block copolymers.
数据来源: Taylor
摘要:
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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