Side-Chain Liquid-Crystal Polymers:  Gel-like Behavior below Their Gelation Points

Side-Chain Liquid-Crystal Polymers:  Gel-like Behavior below Their Gelation Points

We present microrheology experiments on a series of polysiloxane-type liquid-crystal polymers with mesogen-graft amounts of 25%, 70% and 100%. The experiments, conducted as a function of sample thickness, show that the low-frequency response of all of these polymers shifts progressively from a liqui...

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Veröffentlicht in:Macromolecules 1999-03, Vol.32 (6), p.1746-1752
Hauptverfasser: Martinoty, P, Hilliou, L, Mauzac, M, Benguigui, L, Collin, D
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Sprache:eng
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Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
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container_end_page 1752
container_issue 6
container_start_page 1746
container_title Macromolecules
container_volume 32
creator Martinoty, P
Hilliou, L
Mauzac, M
Benguigui, L
Collin, D
description We present microrheology experiments on a series of polysiloxane-type liquid-crystal polymers with mesogen-graft amounts of 25%, 70% and 100%. The experiments, conducted as a function of sample thickness, show that the low-frequency response of all of these polymers shifts progressively from a liquid-type behavior for thick samples (>100 μm) to a purely elastic behavior for thin samples (
doi_str_mv 10.1021/ma981291n
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The experiments, conducted as a function of sample thickness, show that the low-frequency response of all of these polymers shifts progressively from a liquid-type behavior for thick samples (&gt;100 μm) to a purely elastic behavior for thin samples (&lt;20 μm). This surprising change in behavior, which occurs in all phases including the isotropic phase, points to the fact that these polymers do not behave like melts but like gels below their gelation point. Comparison of the results obtained in the nematic and isotropic phases shows that the clusters are not sensitive to the orientational order. The absence of any rubbery plateau (in the case of thick samples) and the simultaneous presence of a low-frequency elastic plateau (in the case of thin samples) are indicative of the existence of temporary knots of a new type, associated with interaction between the mesogens. We also present a confined-geometry percolation model and a model consisting of an association in parallel of the elastic and viscous regions which make up the sample. 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subjects Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
title Side-Chain Liquid-Crystal Polymers:  Gel-like Behavior below Their Gelation Points
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