A Novel <i>N</i>‐Succinylchitosan‐<i>graft</i>‐Polyacrylamide/Attapulgite Composite Hydrogel Prepared through Inverse Suspension Polymerization

Li, Ping; Zhang, Junping; Wang, Aiqin

doi:10.1002/mame.200700081

Cited by 45 publications

(23 citation statements)

References 38 publications

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“…The analysis of the micrographs (the sample was taken using SEM (JSM-5600LV, JEOL, Ltd.).) proved that there are really many micropores on the NSC-g-PAM/APT composite, which could be convenient for the penetration of dye into the network [30].…”

Section: Preparation Of Nsc-g-pam/apt Composite and Their Characterizmentioning

confidence: 99%

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Adsorption characteristics of methylene blue onto the N-succinyl-chitosan-g-polyacrylamide/attapulgite composite

Zhao

Wang

et al. 2011

Korean J. Chem. Eng.

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N-succinyl-chitosan-g-polyacrylamide/attapulgite (NSC-g-PAM/APT) composite was applied as adsorbent for the removal of methylene blue (MB) from aqueous solution. The initial pH value of the dye solutions, the contact temperature, the contact time and the concentration of the dye solutions on adsorption capacity of the composite for MB dye were investigated. The adsorption kinetics and isotherms were also studied. It was shown that all the sorption processes were better fitted by pseudo-second-order equation and the Langmuir equation. The results indicated that the adsorption capacity of the composite was higher than those of chitosan (CTS) and attapulgite (APT). The desorption studies revealed that the composite provided the potential for regeneration and reuse after MB dye adsorption, which implied that the composite could be used as quite effective adsorbent for the removal of MB from aqueous solution.

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Section: Preparation Of Nsc-g-pam/apt Composite and Their Characterizmentioning

confidence: 99%

“…The composite was prepared by the method of Li et al [30]. The preparation procedure of NSC-g-PAM was similar to that of NSCg-PAM/APT composite except without APT.…”

Section: Preparation Of Nsc-g-pam/apt Composite and Their Characterizmentioning

confidence: 99%

Adsorption characteristics of methylene blue onto the N-succinyl-chitosan-g-polyacrylamide/attapulgite composite

Zhao

Wang

et al. 2011

Korean J. Chem. Eng.

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“…On the basis of our previous work on Nsuccinyl-chitosan-g-polyacrylamide/attapulgite composite hydrogel and chitosan [14], novel SucChi/alginate hydrogel beads were prepared by dropping aqueous solution containing Suc-Chi and alginate into a Ca 2+ solution. Then, the beads were used as a pH-sensitive controlled release system for the delivery of nifedipine.…”

Section: Introductionmentioning

confidence: 99%

“…Sodium alginate showed the following distinct peaks: (1) strong absorption bands at 1617 and 1417 cm À1 due to carboxyl anions (asymmetric and symmetric stretching vibrations); (2) the bridge oxygen (C-O-C, cyclic ether) stretching bands at 1030 cm À1 . For the Suc-Chi/alginate blank beads, the absorption band at 1567 cm À1 of Suc-Chi shifted to 1519 cm À1 after the reaction with alginate, the stretching vibration of -OH and -NH 2 at 3422 cm À1 became broad, indicating intramolecular and intermolecular hydrogen bonds were formed and enhanced between Suc-Chi and alginate [14,23].…”

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confidence: 97%

A novel pH sensitive N‐succinyl chitosan/alginate hydrogel bead for nifedipine delivery

Dai

Zhang

et al. 2008

Biopharm & Drug Disp

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127

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A novel N-succinyl chitosan(Suc-Chi)/alginate hydrogel bead was prepared by the ionic gelation method for the controlled delivery of nifedipine. The structure and surface morphology of the hydrogel were characterized by FTIR and SEM, respectively. Factors influencing the swelling ability of the hydrogel bead were also investigated, such as the ratio of Suc-Chi and alginate (X(1)), the weight ratio of drug to polymer (X(2)), the volume ratio of alginate/Suc-Chi to CaCl(2) (X(3)), crosslinking time (X(4)), CaCl(2) concentration (X(5)). In addition, the delivery behavior of nifedipine from the hydrogel bead was studied. The amount of nifedipine released from the hydrogel bead at pH 1.5 was relatively low (11.6%), while this value approached 76% at pH 7.4. The results clearly suggested that the Suc-Chi/alginate hydrogel bead may be a potential polymeric carrier for drug delivery in the intestinal tract. The release of nifedipine from the hydrogel bead at various pH values was analysed by a semi-empirical equation and it was found that the drug release mechanisms were either 'anomalous transport' or 'case-II transport'.

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“…These results may be attributed to the physical barrier effect of ATP in the polymeric network, where ATP impedes the diffusion of decomposition reaction in nanocomposites. 51,52 Moreover, the physical barrier effect may be more pronounced in the PS/M-ATP nanocomposites due to the effective organic/inorganic hybrid network formed of physical and chemical cross-linking.…”

Section: Morphology Observationmentioning

confidence: 99%

Polystyrene/attapulgite nanocomposites prepared via in situ suspension polymerization with redox initiation system

Zhang

et al. 2014

J of Applied Polymer Sci

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A series of polymer-clay nanocomposites consisting of polystyrene (PS) and attapuglite (ATP) were prepared successfully. First, silane coupling agent containing aromatic tertiary amine groups was synthesized to functionalize ATP (M-ATP). Then, PS nanocomposites with varied clay loadings were prepared via in situ suspension polymerization process with a redox initiation system consisting of aromatic tertiary amine and benzoyl peroxide. The synthesis of silane coupling agent and functionalization of ATP were confirmed by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectra, and X-ray photoelectron spectroscopy. Mechanical properties, morphology, thermal stability, and rheological behavior of nanocomposites were investigated to illuminate the effects of M-ATP on the structure and properties of nanocomposites. Field-emission scanning electron microscope images revealed an ideal dispersion of M-ATP and an enhanced toughness of nanocomposites. The improved interface interaction between M-ATP and PS matrix endowed the nanocomposites with outstanding mechanical properties and thermal stability. The formation of hybrid network in the nanocomposites containing 3 wt % M-ATP resulted in higher complex viscosity (g*), storage modulus (G 0 ), and lower loss factor (tand) compared with the pristine PS and PS/ATP nanocomposites.

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A Novel N‐Succinylchitosan‐graft‐Polyacrylamide/Attapulgite Composite Hydrogel Prepared through Inverse Suspension Polymerization

Cited by 45 publications

References 38 publications

Adsorption characteristics of methylene blue onto the N-succinyl-chitosan-g-polyacrylamide/attapulgite composite

Adsorption characteristics of methylene blue onto the N-succinyl-chitosan-g-polyacrylamide/attapulgite composite

A novel pH sensitive N‐succinyl chitosan/alginate hydrogel bead for nifedipine delivery

Polystyrene/attapulgite nanocomposites prepared via in situ suspension polymerization with redox initiation system

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