FTIR studies of calcium and sodium ionomers derived from an ethylene–methacrylic acid copolymer

✍ Scribed by Painter, P. C. ;Brozoski, B. A. ;Coleman, M. M.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1982
• Tongue: English
• Weight: 636 KB
• Volume: 20
• Category: Article
• ISSN: 0098-1273
• DOI: 10.1002/pol.1982.180200614

✦ Synopsis

Abstract

A systematic study of the sodium and calcium salts of an ethylene–methacrylic acid copolymer is reported. Fourier‐transform infrared spectroscopy (in the midinfrared region) is applied to the characterization of structural changes as a function of temperature and time of annealing. In the spectra of calcium ionomers, bands associated with carboxylate dimers are identified and assignments of specific spectral features to multiplets and clusters are discussed. The spectroscopic changes observed in the spectra of sodium ionomers differ somewhat from their calcium counterparts in that a single infrared band attributed to isolated carboxylate groups is observed. Assignments of specific bands to multiplets and clusters can, however, be made in a manner consistent with the interpretation of the spectra of calcium ionomers.