DOI: 10.1126/science.272.5259.252. Orientation-On-Demand Thin Films: Curing of Liquid Crystalline Networks in ac Electric Fields

Orientation-On-Demand Thin Films: Curing of Liquid Crystalline Networks in ac Electric Fields

10.1126/science.272.5259.252

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

Electric fields have been used in the processing of thin film, liquid crystal thermosets to produce cured network structures selectively oriented either parallel or perpendicular to a film substrate. Orientation, which depends on both the liquid crystal nature of the thermosets and their dielectric anisotropy, is selected by varying the frequency of the alternating electric field and is locked into a robust network structure by a cross-linking reaction that takes place concurrent with orientation. Structural changes and orientation during the curing reaction were measured in real time with synchrotron x-ray diffraction. Diffraction studies show that, before curing in a modest electric field of 1 volt per micrometer, reorientation can be induced by changing, for example, from a high-frequency (>1000 hertz) to a low-frequency (<50 hertz) electric field, which causes a 90-degree flip in the molecular orientation.

Bibliography

KÃ¶rner, H., Shiota, A., Bunning, T. J., & Ober, C. K. (1996). Orientation-On-Demand Thin Films: Curing of Liquid Crystalline Networks in ac Electric Fields. Science, 272(5259), 252â255.

Authors 4

Hilmar Körner (first)
Atsushi Shiota (additional)
Timothy J. Bunning (additional)
Christopher K. Ober (additional)

References 13 Referenced 70

BARCLAY G.G., RIGID-ROD THERMOSETS BASED ON 1,3,5-TRIAZINE-LINKED AROMATIC ESTER SEGMENTS, MACROMOLECULES 25, 2947 (1992). (10.1021/ma00037a025) / MACROMOLECULES / RIGID-ROD THERMOSETS BASED ON 1,3,5-TRIAZINE-LINKED AROMATIC ESTER SEGMENTS by BARCLAY G.G. (1992)
BARCLAY G.G., LIQUID-CRYSTALLINE AND RIGID-ROD NETWORKS, PROGRESS IN POLYMER SCIENCE 18, 899 (1993). (10.1016/0079-6700(93)90021-4) / PROGRESS IN POLYMER SCIENCE / LIQUID-CRYSTALLINE AND RIGID-ROD NETWORKS by BARCLAY G.G. (1993)
BLINOV L.M., ELECTROOPTIC EFFECTS (1994). / ELECTROOPTIC EFFECTS by BLINOV L.M. (1994)
BROER D.J., ORIENTED POLYMER NETWORKS OBTAINED BY PHOTOPOLYMERIZATION OF LIQUID-CRYSTALLINE MONOMERS, ANGEWANDTE MAKROMOLEKULARE CHEMIE 183, 45 (1990). (10.1002/apmc.1990.051830103) / ANGEWANDTE MAKROMOLEKULARE CHEMIE / ORIENTED POLYMER NETWORKS OBTAINED BY PHOTOPOLYMERIZATION OF LIQUID-CRYSTALLINE MONOMERS by BROER D.J. (1990)
CHEUNG J.H., MOLECULAR SELF-ASSEMBLY OF CONDUCTING POLYMERS, THIN SOLID FILMS 244, 985 (1994). (10.1016/0040-6090(94)90616-5) / THIN SOLID FILMS / MOLECULAR SELF-ASSEMBLY OF CONDUCTING POLYMERS by CHEUNG J.H. (1994)
DECHER G, BUILDUP OF ULTRATHIN MULTILAYER FILMS BY A SELF-ASSEMBLY PROCESS .1. CONSECUTIVE ADSORPTION OF ANIONIC AND CATIONIC BIPOLAR AMPHIPHILES ON CHARGED SURFACES, MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA 46, 321 (1991). (10.1002/masy.19910460145) / MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA / BUILDUP OF ULTRATHIN MULTILAYER FILMS BY A SELF-ASSEMBLY PROCESS .1. CONSECUTIVE ADSORPTION OF ANIONIC AND CATIONIC BIPOLAR AMPHIPHILES ON CHARGED SURFACES by DECHER G (1991)
FERREIRA M, MOLECULAR SELF-ASSEMBLY OF CONJUGATED POLYIONS - A NEW PROCESS FOR FABRICATING MULTILAYER THIN-FILM HETEROSTRUCTURES, THIN SOLID FILMS 244, 806 (1994). (10.1016/0040-6090(94)90575-4) / THIN SOLID FILMS / MOLECULAR SELF-ASSEMBLY OF CONJUGATED POLYIONS - A NEW PROCESS FOR FABRICATING MULTILAYER THIN-FILM HETEROSTRUCTURES by FERREIRA M (1994)
HAASE W, SIDE CHAIN LIQUID CR (1989). / SIDE CHAIN LIQUID CR by HAASE W (1989)
10.1126/science.7624795
MCNAMEE S.G., PROBING THE ELECTRIC-FIELD ALIGNMENT OF A THERMOTROPIC LIQUID-CRYSTALLINE POLYMER BY SYNCHROTRON-RADIATION, LIQUID CRYSTALS 17, 179 (1994). (10.1080/02678299408036558) / LIQUID CRYSTALS / PROBING THE ELECTRIC-FIELD ALIGNMENT OF A THERMOTROPIC LIQUID-CRYSTALLINE POLYMER BY SYNCHROTRON-RADIATION by MCNAMEE S.G. (1994)
MCNAMEE S.G., THE EFFECT OF ELECTRIC AND MAGNETIC-FIELDS ON THE MELT ORGANIZATION OF A NEMATIC CYCLIC SILOXANE LIQUID-CRYSTAL, LIQUID CRYSTALS 18, 787 (1995). (10.1080/02678299508036691) / LIQUID CRYSTALS / THE EFFECT OF ELECTRIC AND MAGNETIC-FIELDS ON THE MELT ORGANIZATION OF A NEMATIC CYCLIC SILOXANE LIQUID-CRYSTAL by MCNAMEE S.G. (1995)
10.1126/science.261.5126.1299
MORMANN W, ANISOTROPIC THERMOSET NETWORKS BASED ON RING-FORMING MONOMERS - (CYANATE ESTERS AND ISOCYANATES), MACROMOLECULAR SYMPOSIA 93, 97 (1995). (10.1002/masy.19950930114) / MACROMOLECULAR SYMPOSIA / ANISOTROPIC THERMOSET NETWORKS BASED ON RING-FORMING MONOMERS - (CYANATE ESTERS AND ISOCYANATES) by MORMANN W (1995)

Dates

Type	When
Created	18 years, 10 months ago (Oct. 27, 2006, 2:30 p.m.)
Deposited	1 year, 7 months ago (Jan. 12, 2024, 4:56 p.m.)
Indexed	1 week, 3 days ago (Aug. 21, 2025, 2:06 p.m.)
Issued	29 years, 4 months ago (April 12, 1996)
Published	29 years, 4 months ago (April 12, 1996)
Published Print	29 years, 4 months ago (April 12, 1996)

Funders 0

None

BibTeX

@article{K_rner_1996, title={Orientation-On-Demand Thin Films: Curing of Liquid Crystalline Networks in ac Electric Fields}, volume={272}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.272.5259.252}, DOI={10.1126/science.272.5259.252}, number={5259}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Körner, Hilmar and Shiota, Atsushi and Bunning, Timothy J. and Ober, Christopher K.}, year={1996}, month=apr, pages={252–255} }

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