Characterization of the One Step Polymide Synthesis
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1994
- Accession Number
- ADA281216
Entities
People
- C. S. Sung
- G. Jen
- S. J. Huang
Organizations
- University of Connecticut