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Title: Theoretical predictions for side-chain liquid-crystal polymers and comparison to experiment

Abstract

This paper presents results from a new unique microscopic molecular theory for side-chain liquid-crystalline polymers (LCPs) in the nematic (N) and multiple smectic-A (SA) LC phases and the isotropic (I) liquid phase. There are no ad hoc or arbitrarily adjustable parameters in this theory. The agreement between the theoretical and experimental values for various properties (including transition temperatures and quadratic characteristic radii) is very good (relative deviations between 0% and less than 6.2%). The theoretical results also show--for the first time--that the N and I phases for these LCPs involve the packing of plate-like sections of backbones and side chains and that the local bilayer SA phase involves packing of side-chains within a plate-like section. This type of packing is predicted to be typical for side-chain LCPs. This theory can predict--for the first time--whether the side chains of a molecule pack on the same or alternating opposite sides of the backbone and whether side chains on different molecules interdigitate (overlap) with each other. 13 refs., 1 fig., 4 tabs.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
6643358
Report Number(s):
LA-UR-88-3884; CONF-881155-12
ON: DE89003578
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Fall meeting of the Materials Research Society, Boston, MA, USA, 28 Nov 1988; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; POLYMERS; PHYSICAL PROPERTIES; LENNARD-JONES POTENTIAL; LIQUID CRYSTALS; POLYMERIZATION; THEORETICAL DATA; TRANSITION TEMPERATURE; CHEMICAL REACTIONS; CRYSTALS; DATA; FLUIDS; INFORMATION; LIQUIDS; NUMERICAL DATA; POTENTIALS; THERMODYNAMIC PROPERTIES; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-); 360603 - Materials- Properties

Citation Formats

Dowell, F. Theoretical predictions for side-chain liquid-crystal polymers and comparison to experiment. United States: N. p., 1988. Web.
Dowell, F. Theoretical predictions for side-chain liquid-crystal polymers and comparison to experiment. United States.
Dowell, F. 1988. "Theoretical predictions for side-chain liquid-crystal polymers and comparison to experiment". United States. https://www.osti.gov/servlets/purl/6643358.
@article{osti_6643358,
title = {Theoretical predictions for side-chain liquid-crystal polymers and comparison to experiment},
author = {Dowell, F},
abstractNote = {This paper presents results from a new unique microscopic molecular theory for side-chain liquid-crystalline polymers (LCPs) in the nematic (N) and multiple smectic-A (SA) LC phases and the isotropic (I) liquid phase. There are no ad hoc or arbitrarily adjustable parameters in this theory. The agreement between the theoretical and experimental values for various properties (including transition temperatures and quadratic characteristic radii) is very good (relative deviations between 0% and less than 6.2%). The theoretical results also show--for the first time--that the N and I phases for these LCPs involve the packing of plate-like sections of backbones and side chains and that the local bilayer SA phase involves packing of side-chains within a plate-like section. This type of packing is predicted to be typical for side-chain LCPs. This theory can predict--for the first time--whether the side chains of a molecule pack on the same or alternating opposite sides of the backbone and whether side chains on different molecules interdigitate (overlap) with each other. 13 refs., 1 fig., 4 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/6643358}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Conference:
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