Far‐infrared studies of microphase separation in sulfonated ionomers

Abstract

SynopsisFar-infrared spectra of a series of un-neutralized and neutralized lightly sulfonated polystyrenes with varying sulfonation levels have been investigated to seek spectroscopic evidence for microphase separation known to control the physical properties of these polymers. Broad, strong absorbance bands, not found in the spectrum of unmodified polystyrene, are o b s e~e d in the spectra of the sulfonated analogs. The effects on the far-infrared spectra both of sulfonation level and of the mass and charge of the neutralizing cation are discussed in terms of cation motion and the formation of ion-rich domains.

Structural Properties of Ionomers

“…Measurements in the far-infrared reveal two different ionic environments in salts of sulfonated polystyrene (72,73). Cationic motion is observed at 210 and 165 cm -1 and attributed to the presence of both multiplets and clusters in the material.…”

Study of Dynamic Rheological, Dynamic Mechanical and Creep Properties of Acrylonitrile Styrene Acrylate (ASA)/Zn+2poly(ethylene-co-methacrylic acid) Ionomer Blend

“…They act as ionic crosslinks that are moderately strong, temporary, and thermo-reversible in nature. These physical crosslinks play a major role for ionomers high melt viscosity, high stiffness, toughness, abrasion resistance, optical clarity, antistatic properties, melt adhesion properties between the polymers and fillers, and heat sealing ability with several polymers, glass and metals (20,21). The second type of aggregate, called clusters, are larger in size, include nonionic material and more loosely interacting.…”

Thermal, dynamic mechanical, and creep behavior of carbon nanotube reinforced ASA/Na‐ionomer blend

“…These thermo‐reversible ionic aggregates, at room temperature, form temporary crosslinks, which become labile on heating. The ionic aggregates are responsible for the ionomer's high stiffness, toughness, abrasion resistance, heat sealability, interactions with a variety of fillers, and adhesion properties . It also influences melt flow behavior and provides optical clarity and antistatic properties.…”