Accession Number:

ADA281216

Title:

Characterization of the One Step Polymide Synthesis

Descriptive Note:

Technical rept. Jun 1993-May 1994

Corporate Author:

CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s):

Report Date:

1994-06-01

Pagination or Media Count:

4.0

Abstract:

The one step high temperature reaction of 3,3,4,4-benzophenone tetracarboxylic dianhydride BTDA and 1,5-naphthyl diamine DAN in m-cresol was investigated using UV-Visible, fluorescence, and Infrared spectroscopy. Results have shown that UV-Visible can be used to monitor the wavelength shift from the diamine to the polyamic acid to the polyimide. Deconvolution of the spectra at various reaction times revealed the composition of amic acid and imide, which were also in good agreement with the Infrared analysis. Fluorescence spectroscopy utilized the fluorescence nature of the diamine to probe the reactivity of the species during the reaction. Early complexation of the diamine was evidenced by the absence of fluorescence emission due to DAN, which then appeared later in time to a maximum of 9.4. Upon further reaction, DAN is consumed completely, as evidenced by the gradual decline in emission. Investigation of this reaction in NMP with only 10 m-cresol at lower temperatures revealed that the apparent rate constants of amic acid formation was actually slower than the controls, 100 NMP as determined by Infrared. However, these laced systems did induce imidization at the lower temperatures. One-step polymide synthesis, UV-visible, Fluorescence and FT-IR spectroscopy, high temperature reaction in m-cresol.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE