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|Title:||Development of ion exchanger by modification of polypropylene fibre waste using radiation–induced graft polymerization of acrylamide and subsequent amination|
|Keywords:||Acrylamide;Amination;Graft polymerization;Hoffmann degradation;Polypropylene|
|IPC Code:||Int. Cl. ⁸ D06M14/00|
|Abstract:||Radiation-induced graft polymerization of acrylamide onto polypropylene fibre waste has been carried out using pre-irradiation technique to develop material with different degrees of grafting. The influence of reaction conditions, such as pre-irradiation dose, monomer concentration, reaction time and ferrous sulfate, on the degree of grafting has also been studied. The addition of ferrous sulfate beyond 0.4% concentration leads to the homopolymer free grafting reaction. The degree of grafting increases with the increase in monomer concentration, reaches maximum at 30% monomer concentration and then decreases with the further increase in the monomer concentration. A continuous increase in the grafting is achieved with the pre-irradiation dose. The replacement of the ferrous sulfate with acetone as an organic solvent causes complete homopolymer inhibition but a much lower graft levels as compared to the ferrous sulfate addition. The grafted fibre is subsequently aminated by Hoffmann degradation method and the fibre with a maximum ion exchange capacity up to 6.2 meq/g for a graft level of 198% is achieved. The modified fibre also shows excellent water uptake which increases as the degree of grafting increases.|
|Appears in Collections:||IJFTR Vol.33(4) [December 2008]|
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