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Title: Strong liquid-crystalline polymeric compositions

Abstract

Strong liquid-crystalline polymeric (LCP) compositions of matter are described. LCP backbones are combined with liquid crystalline (LC) side chains in a manner which maximizes molecular ordering through interdigitation of the side chains, thereby yielding materials which are predicted to have superior mechanical properties over existing LCPs. The theoretical design of LCPs having such characteristics includes consideration of the spacing distance between side chains along the backbone, the need for rigid sections in the backbone and in the side chains, the degree of polymerization, the length of the side chains, the regularity of the spacing of the side chains along the backbone, the interdigitation of side chains in sub-molecular strips, the packing of the side chains on one or two sides of the backbone to which they are attached, the symmetry of the side chains, the points of attachment of the side chains to the backbone, the flexibility and size of the chemical group connecting each side chain to the backbone, the effect of semiflexible sections in the backbone and the side chains, and the choice of types of dipolar and/or hydrogen bonding forces in the backbones and the side chains for easy alignment. 27 figures.

Inventors:
Publication Date:
OSTI Identifier:
5436992
Patent Number(s):
US 5268584; A
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-046461
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 5 Jun 1992
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; LIQUID CRYSTALS; MOLECULAR STRUCTURE; SYNTHESIS; POLYMERS; CHEMICAL COMPOSITION; CHEMICAL ENGINEERING; CRYSTALS; ENGINEERING; FLUIDS; LIQUIDS; 400201* - Chemical & Physicochemical Properties; 360602 - Other Materials- Structure & Phase Studies

Citation Formats

Dowell, F. Strong liquid-crystalline polymeric compositions. United States: N. p., 1993. Web.
Dowell, F. Strong liquid-crystalline polymeric compositions. United States.
Dowell, F. 1993. "Strong liquid-crystalline polymeric compositions". United States. doi:.
@article{osti_5436992,
title = {Strong liquid-crystalline polymeric compositions},
author = {Dowell, F.},
abstractNote = {Strong liquid-crystalline polymeric (LCP) compositions of matter are described. LCP backbones are combined with liquid crystalline (LC) side chains in a manner which maximizes molecular ordering through interdigitation of the side chains, thereby yielding materials which are predicted to have superior mechanical properties over existing LCPs. The theoretical design of LCPs having such characteristics includes consideration of the spacing distance between side chains along the backbone, the need for rigid sections in the backbone and in the side chains, the degree of polymerization, the length of the side chains, the regularity of the spacing of the side chains along the backbone, the interdigitation of side chains in sub-molecular strips, the packing of the side chains on one or two sides of the backbone to which they are attached, the symmetry of the side chains, the points of attachment of the side chains to the backbone, the flexibility and size of the chemical group connecting each side chain to the backbone, the effect of semiflexible sections in the backbone and the side chains, and the choice of types of dipolar and/or hydrogen bonding forces in the backbones and the side chains for easy alignment. 27 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month =
}
  • Strong liquid-crystalline polymeric (LCP) compositions of matter. LCP backbones are combined with liquid crystalline (LC) side chains in a manner which maximizes molecular ordering through interdigitation of the side chains, thereby yielding materials which are predicted to have superior mechanical properties over existing LCPs. The theoretical design of LCPs having such characteristics includes consideration of the spacing distance between side chains along the backbone, the need for rigid sections in the backbone and in the side chains, the degree of polymerization, the length of the side chains, the regularity of the spacing of the side chains along the backbone, themore » interdigitation of side chains in sub-molecular strips, the packing of the side chains on one or two sides of the backbone to which they are attached, the symmetry of the side chains, the points of attachment of the side chains to the backbone, the flexibility and size of the chemical group connecting each side chain to the backbone, the effect of semiflexible sections in the backbone and the side chains, and the choice of types of dipolar and/or hydrogen bonding forces in the backbones and the side chains for easy alignment.« less
  • A homopolymer of 2-acrylamido-2-methylpropanesulfonic acid is described as a thickener for a mineral or carboxylic acid, the acid having a concentration such that the pH is between 2 and 0. The compositions are stable at ambient and elevated temperatures. The required concentration of thickener is 0.05% to 5.0%. The thickener produces high viscosities in 15% hydrochloric acid. The viscosities are stable for weeks at ambient temperatures. The compositions have been heated at temperatures of 65/sup 0/C for one hour without destroying the after cooling viscosity. The homopolymer does not precipitate from strong acid solutions even upon addition of multivalent ions.more » The viscosities of the compositions can be increased by the use of certain alcohols as stabilizers. The thickened acids are useful in the controlled release of viscous acidic liquids, such as retarding the action of acids on limestone during acidizing of oil wells. (4 claims)« less
  • A polymeric composition comprising a polymeric material and polyethylene glycol or end-capped polyethylene glycol as a phase change material, said polyethylene glycol and said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g; the composition is useful in making molded and/or coated materials such as flooring, tiles, wall panels and the like; paints containing polyethylene glycols or end-capped polyethylene glycols are also disclosed.