Preparation and Characteristics of Corn Straw-Co-AMPS-Co-AA Superabsorbent Hydrogel

Polymers

Wei-Min Cheng²  Xiang-Ming Hu²  De-Ming Wang¹  Guo-Hua Liu³ 

[1]Key Lab of Gas and Fire Control for Coal Mines of Ministry of Education, Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

[2]

[3]State Key Laboratory Cultivation Base of Mining Disaster Prevention and Control, College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China

关键词: corn straw;    sulfonated cellulose;    superabsorbent hydrogel;    acrylic acid;    water absorption;   

DOI  :  10.3390/polym7111522

来源: mdpi

【 摘 要 】

In this study, the corn straw after removing the lignin was grafted with 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to prepare sulfonated cellulose. The grafting copolymerization between the sulfonated cellulose and acrylic acid (AA) was performed using potassium persulfate and N,N′-methylenebisacrylamide as the initiator and crosslinking agent, respectively, to prepare corn straw-co-AMPS-co-AA hydrogels. The structure and properties of the resulting hydrogels were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and dynamic rheometry. The effects of initiator, crosslinker, monomer neutralization degree, and temperature on the swelling ratio of the hydrogels were studied. The water retention, salt resistance, and recyclability of the corn straw-co-AMPS-co-AA hydrogels were also investigated. The optimum water absorptivity of the corn straw hydrogels was obtained at a polymerization temperature of 50 °C with 1.2% crosslinker, 1:7 ratio of the pretreated corn straw and AA, 2% initiator, and 50% neutralized AA.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.