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Form birefringence dispersion of an oriented poly(styrene-b-isoprene) triblock copolymer (SIS) with cylindrical texture

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  • Polymer Science
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Summary

We applied Wiener's theory to calculate form birefringence dispersion of an oriented block copolymer from dispersion formulas of refractive indices of bulk polymers corresponding to the blocks forming the microdomains. The nearly perfect concordance of the measured birefringence dispersion with the calculated one seems to indicate an almost complete lack of molecular orientation inside microdomains. The importance of birefringence dispersion involves modification of interference spectrum in white light. This phenomenon may induce errors when ultilizing a Berek compensator for birefringence measurements.

Zusammenfassung

Mit Hilfe der Wienerschen Theorie wird die Dispersion der Formdoppelbrechung eines orientierten Block-Copolymeren aus den Dispersionen der Brechungsindizes der Polymeren berechnet, die den aggregatbildenden Blöcken entsprechen. Die fast perfekte Übereinstimmung der gemessenen mit der berechneten Dispersion weist darauf hin, daß eine molekulare Orientierung innerhalb der Aggregate fast vollständig fehlt. Die Stärke der Dispersion der Doppelbrechung führt zu einer Änderung der normalen Interferenzfarbenfolge in weißem Licht. Dies kann zu Meßfehlern führen, wenn ein Berek-Kompensator zur Bestimmung der Größe der Doppelbrechung benutzt wird.

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Pixa, R., Schirrer, R. Form birefringence dispersion of an oriented poly(styrene-b-isoprene) triblock copolymer (SIS) with cylindrical texture. Colloid & Polymer Sci 259, 435–446 (1981). https://doi.org/10.1007/BF01524880

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  • DOI: https://doi.org/10.1007/BF01524880

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