TITLE

Conformational properties for linear nematic and cholesteric polymers in the bend elastic chain model

AUTHOR(S)
Varichon, L.; ten Bosch, A.
PUB. DATE
January 1994
SOURCE
Journal of Chemical Physics;1/15/1994, Vol. 100 Issue 2, p1708
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The chain conformation of a liquid crystal polymer will be modified at the isotropic–anisotropic phase transition. Numerical results for the end-to-end distance and the radius of gyration of the polymer are presented using the bend elastic chain to model the polymer and including anisotropic mean field interactions. Anisotropy of conformation is calculated in nematics in the direction of preferred orientation as given by the component . In cholesterics, anisotropy occurs perpendicular to the director as well and ≠. The conformation is studied as a function of temperature, degree of polymerization, and persistence length. In cholesterics, a modification of the conformation is also found at those values of parameters (temperature, molecular weight) for which the pitch diverges and changes sign.
ACCESSION #
7632837

 

Related Articles

  • Mean field theory for solutions of main-chain liquid crystalline polymers. Matsuyama, Akihiko; Kato, Tadaya // Journal of Chemical Physics;8/1/1998, Vol. 109 Issue 5, p2023 

    Develops a mean field theory to describe the nematic-isotropic phase transition in solution of main-chain liquid crystalline polymer (MLCP). Composition of MLCP; Calculation of free energy for MLCP solution; Integration of mesogen nematic ordering and spacer partial ordering in nematic phase;...

  • Novel biaxial nematic phases of side-chain liquid crystalline polymers. Matsuyama, Akihiko // Journal of Chemical Physics;12/14/2012, Vol. 137 Issue 22, p224906 

    We present a mean field theory to describe biaxial nematic phases of side-chain liquid crystalline polymers, in which rigid side-chains (mesogens) and rigid-backbone chains favor mutually perpendicular orientations. Taking into account both excluded volume and attractive interactions between...

  • Loading effect on swelling of nematic elastomers. Urayama, Kenji; Mashita, Ryo; Kobayashi, Ichiro; Takigawa, Toshikazu // Journal of Chemical Physics;10/14/2007, Vol. 127 Issue 14, p144908 

    Externally imposed loading has substantially different effects on the swelling of nematic elastomers in the high-temperature isotropic and low-temperature nematic states. In the isotropic state, the stretching drives a considerably large degree of further swelling, whereas the stretching-induced...

  • Compression induced phase transition of nematic brush: A mean-field theory study. Jiuzhou Tang; Xinghua Zhang; Dadong Yan // Journal of Chemical Physics;2015, Vol. 143 Issue 20, p1 

    Responsive behavior of polymer brush to the external compression is one of the most important characters for its application. For the flexible polymer brush, in the case of low grafting density, which is widely studied by the Gaussian chain model based theory, the compression leads to a uniform...

  • Structure formation in liquid crystalline polymers. Hamm, M.; Goldbeck-Wood, G.; Zvelindovsky, A. V.; Sevink, G. J. A.; Fraaije, J. G. E. M. // Journal of Chemical Physics;2/15/2002, Vol. 116 Issue 7, p3152 

    We have developed a simulation technique, based on a dynamic mean field theory to describe the evolution of a melt of liquid crystalline polymers that is quenched below its isotropic–nematic transition temperature. The polymers are described by chains characterized by a bending energy...

  • Order/disorder phase transitions of liquid-crystalline polymers with rigid groups in the side chains. A lattice theory. Auriemma, Finizia; Corradini, Paolo; Vacatello, Michele // Journal of Chemical Physics;12/1/1990, Vol. 93 Issue 11, p8314 

    We present, in this paper, a lattice model of liquid-crystalline polymers with rigid groups attached to a semiflexible main chain through semiflexible spacers. The polymers are modeled as sequences of isodiametric units allocated at the nodes of the face-centered-cubic lattice. The model allows...

  • Observation of shear-induced nematic-isotropic transition in side-chain liquid crystal polymers. Pujolle-Robic, Caroline; Noirez, Laurence // Nature;1/11/2001, Vol. 409 Issue 6817, p167 

    Reports on observations of isotropic nematic phase transitions in side-chain liquid crystal polymers (SCLCP) induced by the orientation of mesogens in relation to the main polymer chain. How flow-induced phase transitions are a fundamental property of non-equilibrium systems but are poorly...

  • Phase transition behavior of silicone based liquid crystalline polymers. Jana, R. N.; Bhunia, H.; Im, C. // e-Polymers;Mar2011, p1 

    Phase transition behavior of silicone based liquid crystalline (LC) polymers with variable isotropic transition temperatures (Ti), synthesized from poly(methyl hydrosiloxane), 10-undecenoic acid based crosslinking agent and cholesterol based side chain mesogen, was studied by differential...

  • Liquid crystallinity in flexible and rigid rod polymers. Pickett, Galen T.; Schweizer, Kenneth S. // Journal of Chemical Physics;3/8/2000, Vol. 112 Issue 10 

    We apply an anisotropic version of the polymer reference interaction site model (PRISM) integral equation description of flexible polymers to analyze athermal liquid crystallinity. The polymers are characterized by a statistical segment length, σ[sub o], and by a physical hard-core thickness,...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics