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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   November-December 2003 , Volume 12 , Number 6; Page(s) 497 To 505.
 
Paper: 

KINETICS AND MECHANISM OF GRAFT COPOLYMERIZATION OF VINYL MONOMERS (ACRYL AMIDE, ACRYLIC ACID, METHACRYLATE) ONTO STARCH BY POTASSIUM DICHROMATE AS REDOX INITIATOR

 
 
Author(s):  TAGHI ZADEH M.T.*, KHOSRAVI M.
 
* Physical Chemistry Department, Faculty of Chemistry, Tabriz University, Tabriz-51664, I.R. Iran
 
Abstract: 
Synopsis Graft copolymerization of vinyl monomers including acryl amide (AAm), acrylic acid (AAc) and methyl methacrylate (MMA) onto starch (St) has been carried out under nitrogen atmosphere in aqueous solution using potassium dichromate, Cr(VI), as redox initiator individually. Dependence of graft yield upon monomer, starch and initiator concentration is investigated as well as reaction temperature by using of gravimetery method. Rate equations obtained are: Rg=[AAm]0.93[I]0.49[St]0.52, Rg=k[AAC]0.95[I]0.44[St]0.46 and Rg=k[MMA]0.95[I]0.44[St]0.46 for St-g-Pam, St-g-PAAc and St-g-PMMA graft polymers, respectively. The kinetics of grafting process has been evaluated by bromometery titration. Finally, activation energies within temperature 50-55°C for St-g-PAAm, St-g-PAAc and St-g-PMMA synthesizes are found to be 48.16, 46.13 and 49.06 kJ/mol.k, respectively. Based on results observed, a suitable mechanism is proposed to justify the results.
 
Keyword(s): KINETICS, STARCH, VINYL MONOMERS, POTASSIUM DICHROMATE, GRAFT COPOLYMERIZATION
 
References: 
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