Ag(I) Catalyzed Grafting of Acrylonitrile onto Gum Arabic by Ce(IV) in H2SO4 Medium: A Kinetic Study. (4th December 2011)

• Record Type: Journal Article
• Authors: Thota, Geeta; Srinivas, P.
• Other Names: Pasinszki T. Academic Editor.
• Is Part Of: ISRN physical chemistry. Volume 2012(2012)
• Publication Date: 2011-12-04
• Subjects: Chemistry, Physical and theoretical -- Periodicals; Chemistry, Physical and theoretical; 35.10 physical chemistry: general; Periodicals; Electronic journals; 541
• DOI: 10.5402/2012/942398
• Languages: English
• ISSNs: 2090-7761

Abstract

Abstract : Grafting of Acrylonitrile (AN) onto water-soluble polymer Gum arabic (GA) was carried out using ceric ammonium sulfate [Ce(IV)] as initiator in the presence and absence of Ag(I) in H2 SO4 medium at 313 K. The rate of oxidation (R oxi ), rate of grafting (R g ), and grafting efficiency (GE) were determined for catalyzed and uncatalyzed grafting and suitable mechanism was proposed to explain the observed results. No homopolymerization in the absence of GA indicates that the polymer obtained is purely a graft copolymer. A probable mechanism involving the formation of Ag(I)-GA adduct followed by its oxidation with Ce(IV) to give Ag(II)-GA adduct, and its decomposition to give initiating radicals is proposed to explain the observed results. The graft polymer was characterized using Fourier-transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), X-ray diffraction, and scanning electron microscopy (SEM) considering GA as reference.