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Superabsorbent Capability and High Retention Ability of China Clay (Kaolinite) /Polyacrylic acid Composites for Aqueous Solution
Tanveer
作者单位E-mail
Tanveer CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China. shah123@mail.ustc.edu.cn 
摘要:
Majority of superabsorbent polymers (SAPs) yet reported either have low gel strength or high production cost. Therefore, we synthesized a novel polyacrylic acid-grafted China clay (Kaolinite) superabsorbent polymer composite (SAPC) with high thermal stability, low cost of production and superior sorption and retention capability for water and salt solution. The resulting SAPCs were extensively characterized and analysed by X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). Results suggested that the composites were thermally stable. Water absorbency increased with increase of clay content up to 45 % while, further increase in clay content decreased the water absorbency. Percentage of acrylic acid (AA) and clay by weight shows the optimum absorbency in the range of 35 and 40% respectively. Crosslinker and initiator contents were optimized to be 0.5% and 0.3% by weight respectively. The resulting polymer composite has shown high water absorbency of about 785 g.g-1 and 103 g.g-1 of 1% NaCl solution with above 90% retention ability at 50 °C. Being non-toxic in nature, environmental friendly and highly economical, this SAPC could be used in Baby diapers, desiccant and for agricultural purposes.
关键词:  China clay, Superabsorbent composite, Kaolinite, water absorbency, acrylic acid
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Superabsorbent Capability and High Retention Ability of China Clay (Kaolinite) /Polyacrylic acid Composites for Aqueous Solution
Tanveer-Ul-Hassan Shah
Abstract:
Majority of superabsorbent polymers (SAPs) yet reported either have low gel strength or high production cost. Therefore, we synthesized a novel polyacrylic acid-grafted China clay (Kaolinite) superabsorbent polymer composite (SAPC) with high thermal stability, low cost of production and superior sorption and retention capability for water and salt solution. The resulting SAPCs were extensively characterized and analysed by X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). Results suggested that the composites were thermally stable. Water absorbency increased with increase of clay content up to 45 % while, further increase in clay content decreased the water absorbency. Percentage of acrylic acid (AA) and clay by weight shows the optimum absorbency in the range of 35 and 40% respectively. Crosslinker and initiator contents were optimized to be 0.5% and 0.3% by weight respectively. The resulting polymer composite has shown high water absorbency of about 785 g.g-1 and 103 g.g-1 of 1% NaCl solution with above 90% retention ability at 50 °C. Being non-toxic in nature, environmental friendly and highly economical, this SAPC could be used in Baby diapers, desiccant and for agricultural purposes.
Key words:  China clay, Superabsorbent composite, Kaolinite, water absorbency, acrylic acid