Liquid single crystal

LSCE liquid single crystal elastomer MAD molding area diagram... [Pg.601]

The techniques used to obtain the untwisted SmC phase structure in low molar mass LCs and SCLCPs are limited to thin layers. In contrast to this, LC elastomers can be macroscopically uniformly oriented by mechanical deformations [230], and this orientation process is not limited to thin samples or suitable dielectric anisotropy of the material. Furthermore, for LC elastomers the oriented structure can be chemically locked in by crosslinking, resulting in the so-called liquid single crystal elastomers [231],... [Pg.267]

Static mechanical properties in the vicinity of the nematic-isotropic transition in liquid single crystal elastomers (LSCEs) have been investigated [10, 11]. In Fig. 5 the deformation L/Lq (mon) is plotted as a function of the reduced temperature red- Here Lo(mon) denotes the length of the LSCE at the phase transition temperature of the nematic-isotropic phase transition and... [Pg.279]

Optical techniques to investigate the isotropic-nematic transition in liquid single crystal ela.stomers have been used [10, 11, 18]. The nematic order parameter (the modulus of the order parameter gy) has been determined by measuring the absorbances AII and Aj using the integrated intensities of the CN absorption band with the incident light polarized parallel and perpendicularly to the director of the monodomain [10, 18]. The result is plotted in Fig. 15 as a function of reduced temperature. It is similar to these obtained for polydomains or-... [Pg.284]

Mechanical Properties of Monodomains Liquid Single Crystal Elastomers... [Pg.292]

Ultrasonic experiments using laser induced phonon spectroscopy have been performed in a nematic liquid single crystal elastomer [48]. The experiments reveal a dispersion step for the speed of sound and a strong anisotropy for the acoustic attenuation constant in the investigated frequency range (100 MHz -1 GHz). These results are consistent with a description of LCEs using macroscopic dynamics [54-56] and reflect a coupling between elastic effects and the nematic order parameter as analyzed in detail previously [48]. [Pg.293]

Kiipfer J, Finkelmann H. 1991. Nematic liquid single crystal elastomers. Makromol Chem Rapid Commun 12 717 726. [Pg.140]

Kiipfer J, Nishikawa E, Finkelmann H. 1994. Densely crosslinked liquid single crystal elastomers. Polym Adv Technol 5 110 115. [Pg.140]

Nishikawa E, Finkelmann H. 1999. Smectic A liquid single crystal elastomers strain induced break down of smectic layers. Macromol Chem Phys 200 312 322. [Pg.141]

Yusuf Y, Sumisaki Y, Kai S. 2003. Birefringence measurement of liquid single crystal elastomer swollen with low molecular weight liquid crystal. Chem Phys Lett 382 198 202. [Pg.144]

The analysis of spectra from liquids, single crystals and disordered samples differ considerably and are treated separately. [Pg.80]

For many radicals the magnetic properties have been determined for different molecular environments or temperatures. In these cases the display of the data follows the order gaseous—liquid—single crystal—polycrystalline environment and for same environment and different temperatures they are arranged according to increasing temperature. [Pg.5]

Liquid Single Crystal Elastomer (LSCE), Anisotropic Network, and Gels... [Pg.6]

The ability to form monodomain structures makes LC elastomers of interest for a number of optical applications where the optical axis of the polymer must be macroscopically and uniformly aligned. Kuepfer and Finkelmann have reported in detail the formation of what was termed nematic liquid single crystal elastomers [29], which are optically similar to organic or inorganic single crystals. [Pg.277]

Kundler, L Finkelmann, H., Strain-Induced Director Reorientation in Nematic Liquid Single Crystal Elastomers. Makromol. Rapid Commun. 1995,16, 679-686. [Pg.56]

Finkelmann, H and Eckert. T., Piezoelectricity of Sf- -liquid single crystal elastomers, Material Research Society 1996 Spring Meeting, San Franci.sco, April 8-12, 1996, Abstracts, 18.6. [Pg.1185]

Orientation Mechanism of Liquid Single Crystal Elastomers During Cyclic Deformation and Recovery... [Pg.72]

Liquid single crystal elastomers (LSCEs) are characterized by a high macroscopically uniform orientation in the liquid-crystalline phase without the require-... [Pg.72]

For the macroscopic orientation of lyotropic elastomers in mechanical fields the same principles as for thermotropic elastomers can be applied. In some ways the situation is even simpler as the rod-like micelles of the hexagonal phase are compatible with an overall prolate network chain conformation. In addition, the lamellar phase built up from disk-like micelles requires an overall oblate chain conformation to form a liquid single-crystal hydrogel (LSCH) [98]. [Pg.36]

Komp A, Ruhe J, Finkelmann H (2005) A versatile preparation route for thin free-standing liquid single crystal elastomers. Macromol Rapid Commun 26(10) 813-818. doi 10.1002/ marc.200500049... [Pg.85]

Kim ST, Finkelmann H (2001) Cholesltaie liquid single-crystal elastraners (LSCE) obtained by the anisotropic deswelling method. Macnunol Rapid Commun 22(6) 429-433. doi 10.1002/1521-3927(20010301)22 6<429 AlD-MARC429>3.0.CO 2- ... [Pg.88]

Yusuf Y, Minami N, Yamaguchi S, Cho DU, Cladis PE, Brand HR, Finkelmann H, Kai S (2007) Shape anisotropy and optical birefringence measurements of dry and swollen liquid single crystal elastomers. J Phys Soc Jpn 76 073602... [Pg.115]

Amigo-Melchior A, Finkelmann H (2002) A concept Iot bifocal contact- or intraocular lenses liquid single crystal hydrogels. Polym Adv Technol 13 363-369... [Pg.117]

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