Infrared Spectroscopic Study of the Binary Blends of Sodium and Zinc Salt Ionomers Produced from Poly(ethylene-co-methacrylic acid)

Abstract

Infrared (IR) and far-infrared studies were performed for the binary blends of sodium and zinc salt ionomers of poly(ethylene-co-methacrylic acid) (EMAA), which are known to show a dramatic improvement of small strain moduli (e.g., stiffness) compared with the two component salts. The IR spectra of the blends showed a new asymmetric carboxylate stretching band at 1569 cm-1, which is assigned to carboxylate groups bridging sodium and zinc cations. When temperature was raised, the bandwidth began to increase at around 310 K, just below a transition temperature (T i = ca. 325 K) observed by DSC and far below the melting of polyethylene crystalline region (T m = ca. 360 K); this increase was almost linear with temperature and continued to 403 K above T m, reflecting the increased distribution of the states of the bridging mode with temperature. These results are explained by a structural transition of ionic aggregates at T i in EMAA ionomers, which was proposed in our previous publications.

Compatibilization of PP/PAE blends by means of the addition of an ionomer

“…To find out whether any reaction occurred, the same peaks in both the experimental and calculated spectrum have to be compared. Thus, the intensity of the absorption band at 1700 cm −1 that corresponds [59, 60] to the carboxyl groups of the ionomer decreased in the experimental spectrum indicating that partial reaction probably took place with the hydroxyl groups of PAE. The existence of these chemical reactions was also proven by the observed increase in the kneading torque of the 80/20 PAE/PEMA‐Zn blend with time (see Fig.…”

Surlyn�/silicate hybrid materials. I. Polymerin situ sol-gel process and structure characterization

“…9 This mode, of course, also exists for aliphatic carboxylic acid small molecules. This peak corresponds to the polymer matrix rather than to the silicate phase, but the fact that it is also observed on difference spectra suggests that it may have been shifted as the result of the polymer in situ sol-gel reactions.…”

Lipophilic Ionomers with Bulky Ion‐Pairs and Effect of Counterion on Miscibility of the Ionomer Blends

“…The FTIR spectra in the carbonyl stretching region for PBMA and 1/1 LI‐PS/PBMA with different ion content are shown in Figure . The peak of 1725 cm −1 was identified as the stretching vibration of the carbonyl group, and no shifts were observed for all samples due to specific interaction to CO bond . The peak position and the width of the band for LI‐PS /PBMA blends were the same as that of PBMA in the whole range of ionic groups content including miscible and immiscible blends.…”