Poly(acrylonitrile) Grafted<i>Ipomoea</i>Seed-Gums:  A Renewable Reservoir to Industrial Gums

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

doi:10.1021/bm049518b

Cited by 60 publications

(50 citation statements)

References 15 publications

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“…Starch which is a low cost abundantly available renewable biopolymer on modification may develop properties comparable to synthetic petroleum-based polymers [1,2] Chemical grafting [3][4][5][6][7] is one of the popular methods for modifying structure and properties of biopolymers. Vinyl grafting on to the polysaccharides improves their shelf life against biodegradation, thermal stability and metal ion binding ability and therefore grafted polysaccharides have a wide range of industrial utility [8].…”

Section: Introductionmentioning

confidence: 99%

Peroxydisulfate initiated synthesis of potato starch-graft-poly(acrylonitrile) under microwave irradiation

Singh¹,

Tiwari²,

Pandey³

et al. 2007

Express Polym. Lett.

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Abstract. Potato starch-graft-poly(acrylonitrile) could be efficiently synthesized using small concentration of ammonium peroxydisulfate (0.0014 M) in aqueous medium under microwave irradiation. A representative microwave synthesized graft copolymer was characterized using Fourier Transform Infrared Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy and Thermogravimetric Analysis. Under microwave conditions oxygen removal from the reaction vessel was not required and the graft copolymer was obtained in high yield using very small amount of ammonium peroxydisulfate, however using the same amount of ammonium peroxydisulfate (0.0014 M) on thermostatic water bath no grafting was observed up to 98°C (even in inert atmosphere). Raising the concentration of the initiator to 0.24 M resulted into 10% grafting at 50°C but in inert atmosphere. The viscosity/shear stability of the grafted starch (aqueous solution) and water/saline retention ability of the microwave synthesized graft copolymer were also studied and compared with that of the native potato starch.

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Section: Introductionmentioning

confidence: 99%

Peroxydisulfate initiated synthesis of potato starch-graft-poly(acrylonitrile) under microwave irradiation

Singh¹,

Tiwari²,

Pandey³

et al. 2007

Express Polym. Lett.

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“…23,24 A chain mechanism 25 is involved due to the formation of sulfate ion radicals (SO 4 2Á ), which are well-known ion chain carriers for the graft copolymerization (Scheme 2). At the same time, APS stimulates the oxidative polymerization reaction of aniline 26 via a medium of cationic radicals and form PANI radicals (Scheme 3).…”

Section: Mechanism For Graft Copolymerizationmentioning

confidence: 99%

Synthesis and characterization of biopolymer‐based electrical conducting graft copolymers

Tiwari

Singh

2008

J of Applied Polymer Sci

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The naturally occurring Guar gum (GG) was chemically modified with polyaniline (PANI) using ammonium persulfate (APS) as oxidant/initiator in acidic condition. The representative graft copolymer was characterized using UV–vis, FTIR, H1 NMR, XRD, TGA, and SEM taking GG and PANI as reference. The affinity of the upper limit for the graft copolymerization has been extensively studied by varying different chemical and physical parameters. All the findings have been discussed, and proposed a plausible mechanism for the graft copolymerization. The grafted GG exhibited hybrid properties of biopolymer as well as PANI, and has electrical conductivity in the range of 1.6 × 10−2 S/cm at room temperature. The electrical conductivity of the grafted biomaterial was quite sensitive with pH, and it could be interesting to combine a biopolymer, isolated from the natural resources with synthetic polymer from petrochemical origin, and yielded an eco‐friendly material of high performance. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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“…Other researchers [20][21][22] have exploited free radical copolymerization of vinyl monomers on to chitosan using persulfate. A chain mechanism [23] is involved due to formation of sulphate ion radicals (SO 4 -.…”

Section: Mechanism For Graft Copolymerizationmentioning

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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Poly(acrylonitrile) GraftedIpomoeaSeed-Gums: A Renewable Reservoir to Industrial Gums

Cited by 60 publications

References 15 publications

Peroxydisulfate initiated synthesis of potato starch-graft-poly(acrylonitrile) under microwave irradiation

Peroxydisulfate initiated synthesis of potato starch-graft-poly(acrylonitrile) under microwave irradiation

Synthesis and characterization of biopolymer‐based electrical conducting graft copolymers

Synthesis and characterization of electrical conducting chitosan-graft-polyaniline

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