Synthesis and Characterization of Montmorillonite-Graft-Acrylic Acid Superabsorbent by Using Glow-Discharge Electrolysis Plasma

Abstract

Crosslinking graft polymerization of poly acrylic/montmorillonite superabsorbent composite in aqueous solution was prepared by using glow-discharge electrolysis plasma, in which acrylic acid and acid-activated montmorillonite were used as starting materials, N,N-methylenebisacrylamide as a crosslinking agent. To optimize the synthetic conditions, seven important parameters of the graft-polymerization were examined in detail, such as the discharge voltage, discharge time, the neutralization of acrylic acid, post polymerization temperature, amounts of crosslinking agent, montmorillonite and acrylic acid used in this study. The structure, thermal stability and morphology of product were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, respectively. The absorbency of poly acrylic/montmorillonite superabsorbent was examined to yield the following results: 1,834 g/g for distilled water, 116 g/g for 0.05 mol/L and 75 g/g for 0.15 mol/L sodium chloride solution. Such excellent character could be important to use in many fields, for example, in agricultural and horticultural applications.

Synthesis of Montmorillonite/Poly(acrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid) Superabsorbent Composite and the Study of its Adsorption

“…Consequently, absorbency decreased. In addition, excessive MMT particles might physically filled in the polymeric network, causing separation of MMT from P(AA-co-AMPS) copolymer and shrinkage of the composite, 23 thus, the absorbency decreased accordingly.…”

Glow discharge electrolysis plasma initiated preparation of temperature/pH dual sensitivity reed hemicellulose-based hydrogels

“…FT-IR spectra of (a) reed hemicellulose and (b) temperature/pH dual sensitivity reed hemicellulose-based hydrogels (The discharge voltage and discharge time was 600 V and 90 s, respectively). CH(CH 3 ) 2 contraction vibration absorption peak (Peng et al, 2011(Peng et al, , 2012Gao et al, 2010). These suggested that the COOH group in the acrylic acid (AA) and hydrophilic groups ( CONH 2 ), hydrophobic isopropyl ( CH(CH 3 ) 2 ) in N-propyl acrylamide (NIPAAm) had been copolymerized with hemicellulose and successfully introduced into the structure of the hydrogel.…”

“…At higher discharge voltage, short chains of molecules were apt to form, as well as monomers were easy to self-crosslinking and implosion, which resulted in the decrease of molecular weight and failure of forming effective space structure. In addition, higher discharge voltage facilitated the degradation of its own network also led to destruction of network structure and lower swelling ratio (Gao et al, 2008(Gao et al, , 2010Lu, Yu, Gao, Yang, & Li, 2011).…”

Super water absorbency OMMT/PAA hydrogel materials with excellent mechanical properties

“…10 This large market evokes a strong desire to develop novel SAPs materials with higher water absorbency and excellent mechanical properties. In recent years, polysaccharide-based, 11 graphene oxide (GO)-based 12 and acrylic acid (AA)-based SAPs [13][14][15][16][17][18][19][20][21][22][23][24][25] have become ubiquitous and indispensable materials. Poly(acrylic acid) (PAA) hydrogels, in particular, dominate the market because of their low price and simple synthesis process.…”

“…Presently, many efforts have been made to improve these performances of PAA-based hydrogels, such as exploiting composite hydrogels including inorganic clay materials, [13][14][15][16][17][18] graphene oxide, 19,20 chitosan, 21,22 silk sericin, 23 maize bran, 24 and designing double-network hydrogels. 25 For example, Li et al 21 reported a dynamic cross-linked network via in situ polymerization of AA and acrylamide (AM) monomers in the aqueous solution of chitosan.…”