Acrylonitrile–acrylic acids copolymers. I. Synthesis and characterization

✍ Scribed by P. Bajaj; D. K. Paliwal; A. K. Gupta

• Book ID: 102737121
• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 667 KB
• Volume: 49
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1993.070490508

✦ Synopsis

Acrylonitrile ( A N ) was copolymerized with acrylic acid ( AA) , methacrylic acid ( M A A ) , and itaconic acid (IA) by the aqueous suspension method at 40°C with ammonium persulfate and sodium metabisulfite as the redox initiator. The reactivity ratios for the AN-AA and AN-IA systems were also calculated by the Finemann-Ross and the Kelen-Tud6s methods. Higher r2 (AA) for the AN-AA system in comparison to r2 ( I A ) for the AN-IA system indicates greater reactivity of AA toward the propagating species. The influence of comonomers on intrinsic viscosity, tacticity, and number-average sequence lengths was studied. 13C-NMR spectra revealed that A N copolymers having approximately 2 mol % of AA have a greater percentage (> 30% ) of isotactic content than of homopolyacrylonitrile. Tacticity has also been calculated from infrared spectra of the polymers using stereospecific absorption bands at 1250 and 1230 cm-' .