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Liquid crystalline gels self-assembled from block copolymers

Verduzco, Rafael and Scruggs, Neal and Kornfield, Julia A. (2005) Liquid crystalline gels self-assembled from block copolymers. In: Liquid Crystals IX. Proceedings of SPIE. No.5936. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 59360H. ISBN 0819459410.

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Self-assembly of coil-SGLCP-coil block copolymers provides a route to model liquid crystalline (LC) gels in concentrations ranging from bulk polymer to gels with as little as 5 wt % polymer in a small-molecule LC host. Triblock copolymers with LC-phobic endblocks associate in a nematic liquid crystal to create crosslinks. An SGLCP midblock allows for solubilization of the network. These materials have a precisely tailored network structure ideal for comparison to theory1 of liquid crystalline elastomers. In addition, the gel responds readily to external fields since the concentration of polymer can be relatively low. In this report we discuss rheological measurements that demonstrate gelation at low polymer concentrations. We show that the association of the PS blocks at low concentration is driven by the presence of the SGLCP, rather than incompatibility between PS and 5CB. We then discuss the alignment of the gels via shear, magnetic fields, electric fields, and alignment surfaces. Finally, we present results on a distinctive striped texture observed in aligned gels when subjected to an applied electric field or normal force. The exceptional electro-optic and mechano-optic responsiveness of these gels coupled with thermally reversible gelation suggests they would be ideal candidates for use in large-area printable display technology.

Item Type:Book Section
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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2005 Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject Keywords:liquid crystal, gel, nematic, self-assembly, block copolymer, display
Series Name:Proceedings of SPIE
Issue or Number:5936
Record Number:CaltechAUTHORS:20180718-165218339
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Official Citation:Rafael Verduzco, Neal Scruggs, Julia A. Kornfield, "Liquid crystalline gels self-assembled from block copolymers", Proc. SPIE 5936, Liquid Crystals IX, 59360H (20 August 2005); doi: 10.1117/12.618477;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87988
Deposited By: George Porter
Deposited On:19 Jul 2018 15:31
Last Modified:16 Nov 2021 00:22

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