Advertisement

The near infrared spectra of some polyamic acid resins

Authors


Abstract

The absorption spectra of a series of polyamic acids prepared using various reaction conditions were studied using the ultraviolet (UV), visible, and near-infrared (IR) ranges. The near-IR proved most valuable; the amidization and imidization processes could be followed by observing the change of intensities of the 1950-nm combination amine band and a band at 2300 nm assumed to be a function of the amide group.

Ancillary