Sodium and zinc salts of poly(ethylene-eo-methacrylic acid) ionomers consist of three phases, i.e. ionic aggregates, amorphous, and crystalline phases. Dye molecules after soaked from the methanol solution are located near the amorphous phase or ionic aggregates within ionomer films. Depending on the location of the molecules in the ionomer film, they are under influence of dispersion forces (ethylene parts), polar forces (acid parts), and ionic dipole (ionic aggregates) interactions. The UV/Vis absorption peak of Nile Red under the dispersion force is found at near 500 nm, for the dye under the polar force effect 525 nm, and 550 and 610 nm for the dyes under Na+ and Zn2+ ionization effects, respectively. Since the divalent Zn2+ ion has larger ionic dipole than the monovalent Na+ ion, the larger red-shift of the absorption band due to the ionic dipole interaction is observed for Zn2+ counter ion.
|Original language||English (US)|
|Number of pages||8|
|Publication status||Published - Dec 1 2001|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Polymers and Plastics
- Materials Chemistry