Abstract
Polymerization of acrylic acid (AA) with native locust bean gum (LBG) was carried out with the use of the peroxydiphosphate (PDP)/Fe2+(FAS) redox initiation system. The factors affecting the efficiency of the redox system and the polymerization process were studied. These factors included the concentration of AA, PDP, FAS, duration of reaction, and polymerization temperature. The polymerization reaction was studied with respect to percentage of total conversion (TC), whereas the resultant polymerization product (i.e., composite) was analyzed for the polymer yield. The latter refers to the percentages of the graft yield (GY), the graft efficiency (GE), homopolymer (HP) and total conversion (TC). The apparent viscosity of the composite at different rates of shear was also examined. The characteristic of the grafted product was evaluated by thermal decomposition TGA in the temperature range (0—700°C). Tentative mechanisms, including different chemical events that can occur thoughout the whole course of polymerization process, are reported.
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