Infrared and Thermal Studies of N-(p-cyanobenzylidene)-p-oxyl-oxyaniline Coated on Derivatized Silica

Abstract

The interaction of CBOA with silicas modified with monoreactive silanes varying in chain length and blocking ability has been studied by Fourier Transforms, Infrared, DSC, and TGA. The derivative TGA curves for the various coated silicas contain two peaks indicating the presence of a two-step desorption process. The complex shapes of the infrared nitrile stretch bands suggest three different interactions. Populations with cyano - cyano interactions, isolated nitrile groups and hydrogen bonded nitrile groups are feasible orientations. Differences in the nitrile stretching frequencies for the octyldimethyl and decyldimethyl silicas can be explained in terms of a dynamic surface model where the bonded chains in contact with the coating reorient at a characteristic temperature and perturb the CBOA.

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Document Details

Document Type
Technical Report
Publication Date
Sep 02, 1988
Accession Number
ADA199291

Entities

People

  • C. J. Hann
  • R. K. Gilpin

Organizations

  • University of Connecticut

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Crystals
  • Desorption
  • Frequency
  • Heat Energy
  • Hydrogen Bonds
  • Liquid Crystals
  • Materials
  • Military Research
  • Orientation (Direction)
  • Phase Transformations
  • Silicon Compounds
  • Spectra
  • Transition Temperature
  • Transitions
  • United States
  • Universities

Readers

  • Materials Science and Engineering.
  • Polymer Science and Engineering.
  • Surface Coatings Technology.