Synthesis and Characterization of Arabic Gum-Grafted-Polyethylene Imine Microgel

Sani Mamman Ibrahim, Babale Abdullahi, Mustapha Bala Mohammed

Abstract


Microgels prepared from natural and synthetic polymers continue to attract the interest of medical and pharmaceutical researchers due to their tunable properties by modifying their molecular structure through derivatization, cross-linking or grafting method. This research developed Arabic gum microgels as smart and stimuli-responsive materials for various applications. Chemically modified Arabic gum microgels were prepared by emulsion polymerization system using Tween20 as surfactant and hexane as the solvent. The modifying agent’s polyethylene imine were successfully cross-linked using N, N’-methylenebisacrylamide and precipitated using sufficient acetone. Physico-chemical methods of characterization such as Fourier transform infrared, differential scanning calorimetry and X-ray diffraction were used to analyzed and confirmed the successful synthesis of the chemically modified microgels. The surface morphology of the microgels were observed using Field emission scanning electron microscope which shows the presence of network structure and porosity arrangements. In response to pH microgels of polyethylene imine swelled more in lower or acidic pH and a lower swelling ratio was observed in higher pH solutions. The swelling of hydrogels also depends on the compositions of the swelling medium. The presence of ions in the medium reduces the swelling ratio for the modified hydrogels. The results confirm the potentials of chemically modified microgels in Industrial and pharmaceuticals applications. 


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