Microwave enhanced synthesis of chitosan-graft-polyacrylamide

Singh, Vandana; Tiwari, Ashutosh; Tripathi, Devendra Narayan; Sanghi, Rashmi

doi:10.1016/j.polymer.2005.10.101

Cited by 193 publications

(96 citation statements)

References 19 publications

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“…Many graft copolymers of chitosan and vinyl monomers have been synthesized and evaluated as flocculants, paper strengthener and drug-releaser (Singh et al, 2006). It has potential applications ranged from biomedicine and pharmacy to water treatment (Yu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Kinetics study of copolymerization of 2-anilinoethanol onto chitosan by ammonium peroxydisulfate as a initiator

Hosseini¹

2015

Int. J. Phys. Sci.

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Section: Introductionmentioning

confidence: 99%

Kinetics study of copolymerization of 2-anilinoethanol onto chitosan by ammonium peroxydisulfate as a initiator

Hosseini¹

2015

Int. J. Phys. Sci.

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“…Chitosan has gained growing interest to prepare semi-interpenetrating chitosan/polyaniline [12][13][14], because of its excellent film-forming ability, good adhesion, biocompatibility, and high mechanical strength. Chitosan is a high molecular weight polysaccharide [15] composed of β(1→4) linked 2-deoxy-2-amino-D-glucopyranose units and β(1→4) linked 2-deoxy-2-acetamido-D-glucopyranose units. Chi-tosan has found potential use in many areas, it is a brittle material and tends to absorb a quantity of moisture and to improve its toughness, solubility and rheological properties, graft copolymerization of a vinyl monomer onto chitosan chains is commonly employed for several applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of electrical conducting chitosan-graft-polyaniline

Tiwari¹,

Singh²,

Marg³

2007

Express Polym. Lett.

104

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Abstract.A mucopolysaccharide, chitosan was grafted with polyaniline through oxidative-radical copolymerization using ammonium persulfate in acidic medium. The grafting conditions were extensively studied by varying grafting parameters. All the findings have been discussed and proposed a plausible mechanism for the graft copolymerization. The representative chitosan-graft-polyaniline (Ch-g-PANI) was characterized using UV-vis, FTIR, TGA, X-ray diffraction and Scanning electron microscopy taking chitosan as reference. Ch-g-PANI exhibited electrical conductivity, which increases with the extent of grafting onto chitosan backbone. Its electrical conductivity is further influenced by pH and showed pH switching electrical conduction behavior when exposed to NN3/HCl vapors. The application of conducting biomaterial such as Ch-g-PANI in the electronic devices especially for the fabrication of sensor devices would be attractive not only in terms of product cost and environmental safety but also from a materials science point of view.

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“…12 Properties of natural fibers treated under MWR technique are same or even better than those of fibers modified through conventional techniques. 13,14 Singh et al 15,16 have graft copolymerized the polyacrylamide onto chitosan and guar gum using MWR technique and found that maximum grafting was observed in very less time.…”

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confidence: 99%

Grafting of Flax Fiber (Linum usitatissimum) with Vinyl Monomers for Enhancement of Properties of Flax-Phenolic Composites

Kaith¹,

Kalia²

2007

Polym J

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ABSTRACT:Binary vinyl monomers such as methylmethacrylate (MMA)/Ethylacrylate (EA), MMA/Acrylonitrile (AN) and MMA/Acrylic acid (AA) have been graft co-polymerized onto flax fibers under the influence of microwave radiations (MWR). Various reaction parameters have been optimized and maximum grafting (25%) was observed in reaction time of 30 min at 210 W microwave power. Flax-g-copolymers thus prepared were used as reinforcing material in the preparation of flax-phenolic composites. Wear resistance was maximum with reinforcement of Flax-gpoly(MMA/AA). Composites reinforced with Flax-g-poly(MMA/EA) showed better tensile strength and can bear load upto 225 N with extension of 3.28 mm and composites reinforced with Flax-g-poly(MMA/AA) showed better compressive strength and can bear load upto 1000 N with compression of 1.74 mm. Maximum values of MOR, MOE and SP were found to be 108.0 N/mm 2 , 5295.62 N/mm 2 and 99.29 N/mm 2 for the composites reinforced with Flax-g-poly-(MMA/AA). On grafting of flax fibers with vinyl monomers, fibers become more and more moisture retardant. It has been found that strength of Flax-g-copolymers was found more than that of raw flax fibers. Flax-g-poly(MMA/ AA) has been found to show good thermal stability in comparison to other graft co-polymers and raw flax fibers. Phenol-formaldehyde (PF) composites reinforced with graft co-polymers of flax fibers showed better mechanical properties in comparison to composites reinforced with raw flax fibers. Composites reinforced with Flax-g-poly(MMA/AA) showed the increased values of MOR, MOE and SP.

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Microwave enhanced synthesis of chitosan-graft-polyacrylamide

Cited by 193 publications

References 19 publications

Kinetics study of copolymerization of 2-anilinoethanol onto chitosan by ammonium peroxydisulfate as a initiator

Kinetics study of copolymerization of 2-anilinoethanol onto chitosan by ammonium peroxydisulfate as a initiator

Synthesis and characterization of electrical conducting chitosan-graft-polyaniline

Grafting of Flax Fiber (Linum usitatissimum) with Vinyl Monomers for Enhancement of Properties of Flax-Phenolic Composites

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