Aramids with Controlled Constitutional Isomerism: Synthesis and Characterization

Abstract

Previously, it has been shown that polycondensates can be synthesized from non-symmetric monomers (XabX) and symmetric monomers (YccY), giving rise to a constitutional isomerism similar to the head/tail isomerism exhibited by vinyl polymers. This constitutional isomerism in polycondensates can be controlled in a predeterminable and continuous manner over a wide range of constitutional order. The order parameter's is quantified by the probability that two adjacent non-symmetric monomeric units are oriented in the same direction relative to the molecular axis. Constitutional isomerism has a profound effect on the properties of polyamides, partly because more constitutionally regular polyamides yield solids of higher three dimensional order than their more irregular counterparts; packing efficiency and crystallinity are direct functions of order. Polyamides; Reprints.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1988
Accession Number
ADA198699

Entities

People

  • F. T. Gentile
  • U. W. Suter
  • W. R. Meyer

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Buildings And Structures
  • Chemical Engineering
  • Chlorides
  • Contracts
  • Differential Equations
  • Engineering
  • Equations
  • Flow Rate
  • Isomers
  • Military Research
  • Molecular Weight
  • Phenylenediamines
  • Polymerization
  • Solvents
  • Spectra
  • Three Dimensional

Readers

  • Calculus or Mathematical Analysis
  • Polymer Science and Technology