Dynamic mechanical properties of ionomer/ionomeric microbead composites

Abstract

JOJ 1 RO SYNOPSISComposites of sulfonated polystyrene (PS-SSA) (0-8 mol % sulfonation) mixed with submicronic styrene-4 vinylpyridine (PS-4VP) (31 mol % 4VP content) microspheres were investigated by differential scanning calorimetry, Fourier transform infrared spectroscopy, and dynamic mechanical spectroscopy at 1 Hz in the glass transition region. The resulting proton transfer reaction from the SSA to the 4VP units was confirmed by IR spectroscopy, and led to a significant increase in the post-T, Young's modulus as well as a lengthening of the rubbery plateau. Surprisingly, the addition of sulfonated polystyrene microspheres to styrene-vinyl pyridine copolymers had no such effects, possibly because of steric factors.

Converting waste plastic containing acrylonitrile into a water‐absorbent polymer

“…As a result, no absorption of the cyano group was found in the modified AS resin. It was also confirmed that the benzene ring in the styrene group was sulfonated to introduce a sulfonic acid group of 1034–1145 cm −11 18–20…”

“…It was also confirmed that the benzene ring in the styrene group was sulfonated to introduce a sulfonic acid group of 1034-1145 cm 211 . [18][19][20] Figure 3 shows the reaction formula of the chemical modification of the waste AS resin using heated high-concentration sulfuric acid. The cyano group of acrylonitrile in the waste AS resin is converted into amide groups and carboxyl groups by hydrolysis, and a sulfuric acid group is introduced into the benzene ring in styrene by sulfonation.…”

Reclamation of Waste Polystyrene by Sulfonation

“…The sulfonic acid and the sulfonate groups in the sulfonated waste polystyrene were confirmed by Fourier transformation infrared spectrum (FT-IR) measurement ,, and FT-NMR measurement . The percentage sulfonation was calculated by titration with NaOH solution against phenolphthalein indicator.…”

Oriented immobilization of Au nanoparticles on C@P4VP core–shell microspheres and their catalytic performance

“…34 Compared to spectrum a, the appearance of a band at 1638 cm À1 in spectrum c is attributed to the formation of a protonated pyridinium group. 37,38 The bands at 1604 and 1420 cm À1 in spectra b and c are attributed to unsaturated stretching vibrations of CQC bonds and stretching vibrations of C-N groups, respectively. The weak band at 1218 cm À1 responds to the stretching vibrations of the N-O bond possibly derived from a partially oxidized pyridine group.…”