Structural Transition in a Nematic LC Block Copolymer Induced by the Transition to the LC Phase

The morphology of a liquid-crystalline ABA triblock copolymer with polystyrene (PS) blocks (12 vol %) and a side chain nematic liquid crystalline B block has been studied by TEM and temperature dependent SAXS measurements. Above the clearing temperature (T c = 122 °C) the morphology is characterized...

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Bibliographic Details
Published in:Macromolecules 1997-11, Vol.30 (22), p.6783-6787
Main Authors: Sänger, J, Gronski, W, Maas, S, Stühn, B, Heck, B
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:The morphology of a liquid-crystalline ABA triblock copolymer with polystyrene (PS) blocks (12 vol %) and a side chain nematic liquid crystalline B block has been studied by TEM and temperature dependent SAXS measurements. Above the clearing temperature (T c = 122 °C) the morphology is characterized by a body-centered cubic (bcc) lattice of polystyrene spheres. The transition to the nematic phase induces a reversible transition to a morphology of hexagonally packed cylinders by coalescence of the PS spheres along the [1,1,1] direction of the bcc lattice.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma970518w