A series of novel superabsorbent composites guar gum-g-poly(sodium acrylate-co-styrene)/vermiculite (GG-g-poly(NaA-co-St)/VMT) were prepared by the simultaneous graft copolymerization of guar gum (GG), partially neutralized acrylic acid (NaA), styrene (St) and vermiculite (VMT) using ammonium persulfate (APS) as the initiator and N,N′-methylene-bis-acrylamide (MBA) as the crosslinker. Fourier transform–infrared (FT-IR) and ultraviolet-visible (UV-vis) spectroscopy revealed that NaA and St had been grafted onto GG main-chain, and VMT participated in polymerization reaction. The simultaneous incorporation of St and VMT improved the surface pore structure, and VMT led to a better dispersion in the polymer matrix as shown by field emission scanning electron microscope (FESEM). Swelling results indicated that the inclusion of proper amount of St and VMT in the superabsorbents induced enhanced swelling capability, rate, and salt-resistant performance. Moreover, the composites showed good pH-stability in the solution of various pHs, and exhibited smart swelling–shrinking on–off swelling characteristic in physiological solution, which can be used as promising candidate for its applications in various fields.
BuchholzFLPeppasNA. Science and technology: in superabsorbent polymers1994ACS Symposium Series 573, Washington, DC: American Chemical Society.
2.
NiBLLiuMZLüSY. Multifunctional slow-release urea fertilizer from ethylcellulose and superabsorbent coated formulations. Chem Eng J2009; 155: 892–898.
3.
LiangRYuanHBXiGXZhouQX. Synthesis of wheat straw-g-poly(acrylic acid) superabsorbent composites and release of urea from it. Carbohydr Polym2009; 77: 181–187.
ChauhanKChauhanGSAhnJ-H. Synthesis and characterization of novel guar gum hydrogels and their use as Cu2+ sorbents. Bioresour Technol2009; 100: 3599–3603.
6.
KaşgözHDurmusA. Dye removal by a novel hydrogel-clay nanocomposite with enhanced swelling properties. Polym Adv Technol2008; 19: 838–845.
7.
TangQWSunXMLiQHWuJHLinJM. Synthesis of polyacrylate/polyethylene glycol interpenetrating network hydrogel and its sorption of heavy-metal ions. Sci Technol Adv Mater2009; 10: 015002 (7p)–015002 (7p).
8.
MurthyPSKMohanYMVaraprasadKSreedharBRajuKM. First successful design of semi-IPN hydrogel–silver nanocomposites: a facile approach for antibacterial application. J Colloid Interface Sci2008; 318: 217–224.
9.
SadeghiMHosseinzadehHJ. Synthesis of starch-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel with salt and pH-responsiveness properties as a drug delivery system. J Bioact Compat Polym2008; 23: 381–404.
10.
WangQZhangJPWangAQ. Preparation and characterization of a novel pH-sensitive chitosan-g-poly(acrylic acid)/attapulgite/sodium alginate composite hydrogel bead for controlled release of diclofenac sodium. Carbohydr Polym2009; 78: 731–737.
11.
KiatkamjornwongSMongkolsawatKSonsukM. Synthesis and property characterization of cassava starch grafted poly[acrylamide-co-(maleic acid)] superabsorbent via γ-irradiation. Polymer2002; 43: 3915–3924.
12.
XieYTWangAQ. Effects of modified vermiculite on water absorbency and swelling behavior of chitosan-g-poly(acrylic acid)/vermiculite superabsorbent composite. J Compos Mater2009; 43: 2401–2415.
13.
PourjavadiAGhasemzadehHSoleymanR. Synthesis, characterization, and swelling behavior of alginate-g-poly(sodium acrylate)/kaolin superabsorbent hydrogel composites. J Appl Polym Sci2007; 105: 2631–2639.
14.
WangWBWangAQ. Preparation, characterization and properties of superabsorbent nanocomposites based on natural guar gum and modified rectorite. Carbohydr Polym2009; 77: 891–897.
15.
PourjavadiAHosseinzadehH. Synthesis, characterization and swelling behavior of gelatin-g-poly(sodium acrylate)/kaolin superabsorbent hydrogel composites. J Compos Mater2007; 41: 2057–2069.
16.
RaySSBousminaM. Biodegradable polymers and their layered silicate nanocomposites: in greening the 21st century materials world. Prog Mater Sci2005; 50: 962–1079.
17.
WanXFLiYMWangXJChenSLGuXY. Synthesis of cationic guar gum-graft-polyacrylamide at low temperature and its flocculating properties. Eur Polym J2007; 43: 3655–3661.
18.
WangWBWangAQ. Synthesis and swelling properties of guar gum-g-poly(sodium acrylate)/Na-montmorillonite superabsorbent nanocomposite. J Compos Mater2009; 43: 2805–2819.
19.
ZhangKXuJWangKYChengLWangJLiuB. Preparation and characterization of chitosan nanocomposites with vermiculite of different modification. Polym Degrad Stab2009; 94: 2121–2127.
20.
AthawaleVDLeleV. Syntheses and characterisation of graft copolymers of maize starch and methacrylonitrile. Carbohydr Polym2000; 41: 407–416.
21.
LeeWFYehYC. Studies on preparation and properties of NIPAAm/hydrophobic monomer copolymeric hydrogel. Eur Polym J2005; 41: 2488–2495.
22.
KennedyJELyonsJGGeeverLMHigginbothamCL. Synthesis and characterisation of styrene butadiene styrene-g-acrylic acid for potential use in biomedical applications. Mater Sci Eng C2009; 29: 1655–1661.
23.
TangCYeSLiuH. Electrospinning of poly(styrene-co-maleic anhydride) (SMA) and water swelling behavior of crosslinked/hydrolyzed SMA hydrogel nanofibers. Polymer2007; 48: 4482–4491.
24.
MarandiGBHaririSMahdaviniaGR. Effect of hydrophobic monomer on the synthesis and swelling behaviour of a collagen-graft-poly[(acrylic acid)-co-(sodium acrylate)] hydrogel. Polym Int2009; 58: 227–235.
25.
ShuklaSBajpaiAKKulkarniRA. Preparation, characterization, and water-sorption study of polyvinyl alcohol based hydrogels with grafted hydrophilic and hydrophobic segments. J Appl Polym Sci2005; 95: 1129–1142.
26.
WangWBZhangJPWangAQ. Preparation and swelling properties of superabsorbent nanocomposites based on natural guar gum and organo-vermiculite. Appl Clay Sci2009; 46: 21–26.
27.
LiAWangAQChenJM. Studies on poly(acrylic acid)/attapulgite superabsorbent composite I. Synthesis and characterization. J Appl Polym Sci2004; 92: 1596–1603.
28.
WuJHLinJMLiGQWeiCR. Influence of the COOH and COONa groups and crosslink density of poly(acrylic acid)/montmorillonite superabsorbent composite on water absorbency. Polym Int2001; 50(9): 1050–1053.
29.
SchottH. Swelling kinetics of polymers. J Macromol Sci Part B Phys1992; 31: 1–9.
30.
LeeWFWumRJ. Superabsorbent polymeric materials 1. Swelling behaviors of crosslinked poly(sodium acrylated-co-hydroxyethyl methacrylate) in aqueous salt solution. J Appl Polym Sci1996; 62: 1099–1114.
31.
ZhangJPChenHLiPWangAQ. (2006). Study on superabsorbent composite, 14. Preparation of poly(acrylic acid)/organo-attapulgite composite hydrogels and swelling behaviors in aqueous electrolyte solution. Macromol Mater Eng1996; 291: 1529–1538.
