Synthesis and characterization of novel oligomeric poly(styrene‐co‐acrylonitrile)–clay complexes

Abstract

ABSTRACT:Oligomeric poly(styrene-co-acrylonitrile) quaternary ammonium salts were prepared through reactions of trimethylamine with corresponding poly(styreneacrylonitrile-vinyl benzyl chloride)s, which were synthesized by the free-radical polymerization of a mixture of styrene, acrylonitrile, and vinyl benzyl chloride. Then, oligomeric poly(styrene-co-acrylonitrile)-modified clays were prepared through the cation exchange of the sodium ions in the clay with the corresponding poly(styrene-co-acrylonitrile) quaternary ammonium salts. The poly(styrene-acrylonitrile-vinyl benzyl chloride)s, poly(styrene-coacrylonitrile) quaternary ammonium salts, and their clay complexes were characterized with infrared spectroscopy, gel permeation chromatography, thermogravimetric analysis, proton nuclear magnetic resonance, X-ray diffraction, and transmission electron microscopy. X-ray diffraction and transmission electron microscopy studies showed that these novel clay complexes were well intercalated. Furthermore, thermogravimetric analysis data indicated that this series of polymerically modified clays had high enough thermal stability for nanocomposites by melt blending. The thermal treatment of one of these novel clays at 250 C under nitrogen was also conducted. Solubility and infrared studies of this thermally treated clay complex revealed that a novel polyimine/enamine structure clay complex had been formed in the gallery of the clay.

Improved Method for Preparation of Amidoxime Modified Poly(acrylonitrile-co-acrylic acid): Characterizations and Adsorption Case Study

“…This is due to the incorporation of AA in the PAN system that interrupt the nitrile-nitrile unit arrangement in the poly(AN-co-AA) chain by the intra or intermolecular interactions resulting in the lower cyclization rate of poly(AN-co-AA) compared to PAN [2]. Moreover, the AN units in a polymer chain also play an important role where the higher number in AN units, the higher the initial degradation temperature due to PAN being much more thermally stable [29]. As shown in Figure 7b (in the range of 400-900 °C) PAN has a more intense peak compared to poly(AN-co-AA).…”