The segregation of poly(styrene-b-isoprene) diblock copolymers to the surface of a polystyrene melt: the effect of the ratio of block lengths |
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Authors: | K Kunz SH Anastasiadis M Stamm T Schurrat F Rauch |
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Institution: | Foundation for Research and Technology - Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, 711 10 Heraklion Crete, Greece, GR Max-Planck-Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany, DE Universit?t Frankfurt, Institut für Kernphysik, 60486 Frankfurt am Main, Germany, DE
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Abstract: | The effect of the ratio of block lengths on the interfacial partitioning of poly(styrene-block-1,4 isoprene) diblock copolymers
from their mixtures with polystyrene homopolymer melt is investigated utilizing a series of copolymers with almost constant
molecular weight but different compositions. The concentration profile of the copolymer is measured directly using the nuclear reaction analysis technique; a segregation of the diblock is found at both the air/polymer surface, due to the lower
surface energy of polyisoprene, and at the substrate/polymer interface. No significant effect of the block length ratio on
the free-surface excess was observed. The block molecular weights have apparently led to dangling chain conformations in the
non-overlapping mushroom and in the overlapping mushroom regimes whereas the brush regime was not accessible; no indications
of a real border between the two former regimes was found.
Received: 20 July 1998 / Received in final form and Accepted: 11 September 1998 |
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Keywords: | PACS 68 10 Gw Interface activity spreading - 68 10 m Fluid surfaces and fluid-fluid interfaces - 68 55 a Thin film structure and morphology |
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