Kinetics and Mechanism of Heterogeneous Graft Polymerization of Acrylonitrile onto Polyvinyl Alcohol Initiated with Ceric Ammonium Nitrate
作者： Darvishi , M T Taghi Zadeh
DOI:
关键词: Monomer 、 Polymerization 、 Aqueous solution 、 Polymer chemistry 、 Materials science 、 Polyvinyl alcohol 、 Acrylonitrile 、 Grafting 、 Copolymer 、 Ceric ammonium nitrate
摘要: A model for a heterogeneous graft polymerization of vinyl andlor acrylic monomers on polyvinyl alcohol(PVA) initiated by cent ions is developed. The can be easily extended to other (poly)hydroxylic substrates . Graft copolymerizationof acrylonitrile (AN) onto PVA was carried out using eerie ammonium nitrate (CAN) as an initiator in aqueous nitric acid medium under N2 atmosphere. optimum conditions grafting were determined studying the effects concentrations initiator, monomer, and percentage copolymer characterized FTIR spectroscopoy yield increases with increasing monomer concentration up 1.728 M, further increases, decreases. yieldincreaseswith 1.31x10-2 M 12 g/L thereafter it decreases pH medium, reaction time, temperature have also been investigated kinetics solution studied bromornetry titration following rate expression: Rpak ' 06 0.62 (PVA)0m observed suitable mechanism suggested overall activation energy copolymerization found 42 .51 kJlmol within range 25—45 'C.
参考文章(9)
Kenneth B. Wiberg, Walter S. Trahanovsky, Oxidation in organic chemistry Academic Press. ,(1982)
G. S. Misra, J. S. Shukla, Harish Narain, Aqueous polymerization of acrylamide initiated by permanganate/oxalic acid redox system Macromolecular Chemistry and Physics. ,vol. 119, pp. 74- 85 ,(1968) , 10.1002/MACP.1968.021190108
M. M. Huque, Md. Habibuddowla, A. J. Mahmood, A. Jabbar Mian, Graft copolymerization onto jute fiber: Ceric ion‐initiated graft copolymerization of methyl methacrylate Journal of Polymer Science Part A. ,vol. 18, pp. 1447- 1458 ,(1980) , 10.1002/POL.1980.170180502
S.N. Bhattacharyya, D. Maldas, Graft copolymerization onto cellulosics Progress in Polymer Science. ,vol. 10, pp. 171- 270 ,(1984) , 10.1016/0079-6700(84)90002-9
Ismael Casinos, Mechanisms for the radical graft polymerization of vinyl and/or acrylic monomers on cellulose Polymer. ,vol. 35, pp. 606- 615 ,(1994) , 10.1016/0032-3861(94)90519-3
A Panda, BC Singh, None, Graft Copolymerization of Acrylic Acid onto Biomedical Polyvinyl Alcohol Initiated by Ce(IV)-Glucose Redox System: Part 2∗ Polymer-plastics Technology and Engineering. ,vol. 35, pp. 487- 496 ,(1996) , 10.1080/03602559608000933
D.J. McDowall, B.S. Gupta, V.T. Stannett, Grafting of vinyl monomers to cellulose by ceric ion initiation Progress in Polymer Science. ,vol. 10, pp. 1- 50 ,(1984) , 10.1016/0079-6700(84)90005-4
Olfat Y. Mansour, Ahmed Nagaty, Grafting of synthetic polymers to natural polymers by chemical processes Progress in Polymer Science. ,vol. 11, pp. 91- 165 ,(1985) , 10.1016/0079-6700(85)90009-7
B. N. Misra, I. K. Mehta, M. Kanthwal, S. Panjloo, Grafting onto poly(vinyl alcohol). II. Graft copolymerization of methyl acrylate and vinyl acetate and their binary mixture using γ-rays as initiator Journal of Polymer Science Part A: Polymer Chemistry. ,vol. 25, pp. 2117- 2125 ,(1987) , 10.1002/POLA.1987.080250808