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Using the “Switchable” Quality of Liquid Crystal Solvents To Mediate Segregation between Coil and Liquid Crystalline Polymers

Scruggs, Neal R. and Kornfield, Julia A. and Lal, Jyotsana (2006) Using the “Switchable” Quality of Liquid Crystal Solvents To Mediate Segregation between Coil and Liquid Crystalline Polymers. Macromolecules, 39 (11). pp. 3921-3926. ISSN 0024-9297. https://resolver.caltech.edu/CaltechAUTHORS:20170724-094445465

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Abstract

The discontinuous change in solvent quality of a liquid crystal (LC) solvent, 5CB, at the nematic−isotropic phase transition produces abrupt changes in the phase behavior of solutions of coil and LC polymers and in the self-assembly of coil−LC block copolymers. Nematic 5CB is strongly selective for a side-group liquid crystal polymer (SGLCP), and isotropic 5CB is a good solvent for both SGLCP and a random coil (polystyrene, PS). In nematic 5CB, unfavorable LC−PS interactions drive phase separation in SGLCP−PS−LC ternary solutions and drive micellization of PS−SGLCP diblocks. In isotropic 5CB, rich phase behavior occurs in both ternary solutions and block copolymer solutions. Despite the fact that isotropic 5CB is a good solvent for both SGLCP and PS, segregation can occur due to the asymmetric solvent effect (i.e., the preference of the solvent for the SGLCP). In concentrated isotropic solutions, unfavorable SGLCP−PS interactions become dominant.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ma052414oDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ma052414oPublisherArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2006 American Chemical Society. Received 11 November 2005. Published online 6 May 2006. Published in print 1 May 2006. This work benefited from use of the shared facilities supported by the MRSEC Program of the National Science Foundation under Award DMR-0080065. The authors also acknowledge financial support from the AFOSR LC-MURI (f4962-97-1-0014). We thank Ed Lang (Argonne National Laboratory, Intense Pulsed Neutron Source) for assistance with SANS experiments and Rafael Verduzco for helpful discussions. A National Defense Science and Engineering Graduate Fellowship awarded to N.R.S. is greatly appreciated.
Funders:
Funding AgencyGrant Number
NSFDMR-0080065
Air Force Office of Scientific Research (AFOSR)f4962-97-1-0014
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20170724-094445465
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170724-094445465
Official Citation:Using the “Switchable” Quality of Liquid Crystal Solvents To Mediate Segregation between Coil and Liquid Crystalline Polymers Neal R. Scruggs, Julia A. Kornfield, Jyotsana Lal Macromolecules 2006 39 (11), 3921-3926 DOI: 10.1021/ma052414o
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79292
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:24 Jul 2017 18:05
Last Modified:03 Oct 2019 18:18

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