Graft Copolymer;Carboxymethyl Cellulose;2-Acrylamidoglycolic Acid;γ-Radiation

Abd El-Mohdy H.L.

《Plastic and Polymer Technology》 3卷 (2014/12) Pp. 1-9

並列摘要

This paper exploited a new approach for synthesis of carboxymethyl cellulose grafted poly 2-acrylamdoglycolic acid (CMC-g-PAG) superabsorbent copolymer in aqueous solution by a simple one-step using γ-radiation as a crosslinking agent. The reaction parameters affecting the equilibrium swelling, i.e., mass ratio of AG to CMC and irradiation dose were systematically optimized to achieve a superabsorbent hydrogel with a maximum swelling capacity. The structure, crystallinity, thermal stability and surface morphology were characterized by Fourier transform infrared spectroscopy (FT-IR) & elemental analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM), respectively. FTIR proved that the grafting reaction occurred between the hydroxyl group of CMC and PAG chain. The thermal analysis data showed that the grafted polymer is more thermally stable than pure CMC. The swelling behavior at various pH solutions, temperature and various ionic salt solutions (NaCl as monovalent, CaCl_2 as divalent and FeCl_3 as trivalent) was investigated in details. The effect of cationic salt solutions on the swelling had the following order: Na^+＞Ca^2+＞Fe^3+. The pH-reversibility was preliminarily investigated with alternating pH between 12 and 2. The results showed that the equilibrium swelling of CMC/PAG was achieved in 70min. The hydrogel was responsive to the pH and salts; and it also has reversible swelling and deswelling character.

並列關鍵字

Graft Copolymer ； Carboxymethyl Cellulose ； 2-Acrylamidoglycolic Acid ； γ-Radiation