| Autor: |
Fares, Mohammad M., El-faqeeh, Adeeb S., Osman, Mohammad E. |
| Předmět: |
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| Zdroj: |
Journal of Polymer Research; 6/1/2003, Vol. 10 Issue 2, p119-125, 7p |
| Abstrakt: |
Grafting of N-tert-butylacrylamide (BAM) onto starch in aqueous medium initiated by ceric ammonium nitrate ion has been studied under N2 atmosphere. The optimum conditions with respect to monomer concentration, initiator concentration, polymerization temperature, polymerization time and material to liquor ratio were studied in terms of percent of grafting efficiency (%GE) and percent of grafting yield (%GY). The optimum conditions obtained for the grafting of BAM on 1.0 g starch were: [BAM] = 0.020 mol/L, [CAN] = 0.91 × 10-3 mol/L. Temperature = 30°C, and Time = 240 min. Starch-g-BAM copolymer was characterized by FTIR, TGA for thermal stability, X-ray diffraction (XRD) for the crystallinity and scanning electron microscope (SEM) for surface morphology of the copolymer. Acid hydrolysis and viscosity average molecular weight (Mv) of copolymer were evaluated for the copolymer. Hydrogels prepared by grafting of BAM onto gelatinized starch showed maximum water uptake and moisture retain of 162% and 63% respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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