Preparation, characterization and properties of superabsorbent nanocomposites based on natural guar gum and modified rectorite

Wang, Wenbo; Wang, Aiqin

doi:10.1016/j.carbpol.2009.03.012

Cited by 118 publications

(35 citation statements)

References 37 publications

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“…Currently, most of the superabsorbents used in practice are petroleum-based synthetic polymer with high production cost and poor environmental friendly properties, 14 and thus new types of multi-component superabsorbents derived from naturally available polysaccharides and facile synthesis methods are desired. [15][16][17][18][19] Semi-interpenetrated polymer network (semi-IPN) is a way of blending two polymers where only one is crosslinked in the presence of the another to produce an additional noncovalent interaction between the two polymers. 20 Semi-IPN is an unique "alloys'' of crosslinked polymers, which has been developed as a convenient technique of preparing multicomponent polymer materials and provided a convenient route to modify the properties of natural polymer-based hydrogels.…”

Section: Introductionmentioning

confidence: 99%

pH-responsive carboxymethylcellulose-g-poly(sodium acrylate)/polyvinylpyrrolidone semi-IPN hydrogels with enhanced responsive and swelling properties

Wang

2011

Macromol. Res.

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Novel pH-responsive semi-interpenetrated polymer network (semi-IPN) superabsorbent hydrogels were prepared by the radical graft polymerization of carboxymethylcellulose (CMC) and partially neutralized acrylic acid (NaA) in the presence of a crosslinker, N,N'-methylene-bis-acrylamide (MBA), and linear polyvinylpyrrolidone (PVP). FTIR spectroscopy showed that NaA was grafted onto the CMC backbone and PVP combined with CMCg-PNaA network by hydrogen-bonding interaction. SEM showed that the formation of a semi-IPN structure improved the surface structure of the hydrogels. The reaction variables, including the mass ratio of acrylic acid (AA) to CMC, MBA concentration and PVP content were optimized, and the crosslinking density of the hydrogels was determined. In addition, the pH-response, swelling behavior of the hydrogel in various saline solutions and aqueous cetyltrimethylammonium bromide (CTAB) solutions were investigated. The results showed that the introduction of CMC and PVP clearly enhanced the swelling capability and rate, and improved the pH-responsive and On-Off switching swelling abilities, salt-resistance, and intriguing time-dependent swelling characteristics.

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Section: Introductionmentioning

confidence: 99%

pH-responsive carboxymethylcellulose-g-poly(sodium acrylate)/polyvinylpyrrolidone semi-IPN hydrogels with enhanced responsive and swelling properties

Wang

2011

Macromol. Res.

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“…In the guar gum spectra, the peak at 1650 cm -1 can be related to the bending vibration of -OH groups (Wang and Wang, 2009), and the peak at 875 cm -1 , which is characteristic of this polymer, refers to galactose and mannose groups (Mudgil et al, 2012;Manikoth et al, 2012).…”

Section: Ftir Spectramentioning

confidence: 99%

Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Souza

Moraes

2016

Braz. J. Chem. Eng.

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-Alpha-bisabolol, an anti-inflammatory and antioxidant compound extracted from candeia trees (Eremanthus erythropappus), was incorporated into hydrophobic polycaprolactone (PCL) and hydrophilic chitosan/guar gum (Ch-G) membranes aiming at the production of bioactive wound dressings. The incorporation efficiency achieved a maximum of ca. 18% (1 gram of alpha-bisabolol per gram of membrane) for Ch-G membranes. For PCL membranes, all of the active compound added was retained (0.2 gram of alpha-bisabolol per gram of membrane). Alpha-bisabolol release in phosphate-buffered saline was relatively slow in both cases, reaching around 6% and 24% after 120 hours respectively for PCL and Ch-G membranes presenting equivalent initial alpha-bisabolol/membrane mass ratios. Both formulations were capable of releasing alpha-bisabolol in the typically recommended topical dose range (from 1 to 10 grams of alphabisabolol per gram of vehicle). The extended release periods observed are advantageous, allowing less frequent dressing changes and contributing to turn the treatment more comfortable for the patient.

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“…2. For pure ammonium alginate, the absorption bands at 3416 cm −1 (O H stretching vibration) [35][36][37], 2930 cm −1 and 2860 cm −1 (CH 2 stretching vibration) [36,38,39], 2469 cm −1 (NH 4 + group) [37,40], 1749 cm −1 and 1384 cm −1 (COO-group) [35,41], 1636 cm −1 (O H bending vibration) [38], 1080 cm −1 and 1158 cm −1 (C OH group) [38], 933 cm −1 (C O C group) [42] and 846 cm −1 (C C bending vibration) were observed. After the for- mation of Ni-alginate gel, the bands at 2930 cm −1 and 2860 cm −1 ascribed to CH 2 stretching vibration nearly disappeared, showing that the polymerization of ammonium alginate chains restrained the vibration of CH 2 group.…”

Section: Resultsmentioning

confidence: 99%

Novel preparation of highly dispersed Ni2P embedded in carbon framework and its improved catalytic performance

Wang

2016

Applied Surface Science

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Preparation, characterization and properties of superabsorbent nanocomposites based on natural guar gum and modified rectorite

Cited by 118 publications

References 37 publications

pH-responsive carboxymethylcellulose-g-poly(sodium acrylate)/polyvinylpyrrolidone semi-IPN hydrogels with enhanced responsive and swelling properties

pH-responsive carboxymethylcellulose-g-poly(sodium acrylate)/polyvinylpyrrolidone semi-IPN hydrogels with enhanced responsive and swelling properties

Incorporation and Release Kinetics of Alpha-Bisabolol From PCL and Chitosan/Guar Gum Membranes

Novel preparation of highly dispersed Ni2P embedded in carbon framework and its improved catalytic performance

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