Synthesis and Water Absorbency of Gum Arabic-Based Superabsorbent Resin

作者：Gan, Ying; Xu, Ji-Hong; Tao, Jun; Yang, Zhong-Lian

来源：Fine Chemicals, 2017, 34(9): 982-987 and 1057.

DOI：10.13550/j.jxhg.2017.09.004

• Cetyltrimethylammonium bromide
• Graft co polymerizations
• Gum arabic
• Sodium dodecyl sulfonate
• Structure and morphology
• Superabsorbent resin
• Swelling behavior
• Water absorbency

Novel graft copolymer (GA-g-PAM/AMPS) superabsorbent resins based on gum arabic (GA), acrylamide (AM) and α-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) were synthesized by graft copolymerization. The structure and morphology of superabsorbent resin were characterized by FTIR, SEM and XRD. The swelling behaviors of superabsorbent resin in different solutions were also studied. The results showed that the resin containing 10% GA (based on total mass of AM and AMPS) showed the highest water absorbency of 835 g/g and 96 g/g in the deionized water and in normal saline, respectively. The resin showed remarkable sensitivity and reversibility in pH=2 and pH=7 solutions and maintained high water absorbency in the pH range from 4 to 11.The water retention rate of the resin was 43%, 65% and 76% at 100℃, 80℃and 60℃, respectively. When the concentration of the resin increased from 2 mmol/L to 50 mmol/L in NaCl solutions, the water absorbency of the resin decreased from 321 g/g to 45 g/g. However, when the concentration of the resin was 10 mmol, the water absorbency in NaCl, BaCl2and FeCl3solutions were 152 g/g, 66 g/g and 18 g/g, respectively. In addition, the surfactants could obviously affect the water absorbency of the resin. As the concentration of surfactants increased from 2 mmol to 50 mmol/L, the water absorbency in sodium dodecyl sulfonate (SDS) solution decreased from 374 g/g to 101 g/g, whereas that in cetyltrimethyl ammonium bromide (CTAB) solution decreased from 295 g/g to 30 g/g, respectively.

• 出版日期2017
• 单位安徽大学