Studies on graft copolymerization of 4‐vinylpyridine onto guar gum

Taunk, Kavita; Behari, Kunj

doi:10.1002/app.10558

Cited by 13 publications

(12 citation statements)

References 13 publications

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“…5), the following additional bands were appeared in the spectra of xanthan-gum-g-(4-vinyl pyridine). Following observation was also observed in previous publication 31 • Poly (4-vinyl pyridine) ring stretching vibration occurred in the region at 1505.8 cm À1 and 1454.1 cm…”

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confidence: 79%

Synthesis and characterization of polysaccharide based graft copolymer by using potassium peroxymonosulphate/ascorbic acid as an efficient redox initiator in inert atmosphere

Kumar¹,

Srivastava²,

Behari³

2009

J of Applied Polymer Sci

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Polysaccharide based graft copolymer (xanthan gum-g-4-vinyl pyridine) was synthesized using potassium peroxymonosulphate/ascorbic acid redox initiator in inert atmosphere at 40 C. By studying the effect of the concentration of monomer, peroxymonosulphate (PMS), ascorbic acid (AA), xanthan gum (XOH), hydrogen ion along with effect of time and temperature on grafting characteristics: grafting ratio (%G), add on (%A), conversion (%C), efficiency (%E), homopolymer (%H), and rate of grafting (Rg), the reaction conditions for optimum grafting were determined. The optimum concentration of AA, H þ ion, 4-VP for maximum grafting were found to be 10.0 Â 10 À3 mol dm À3 , 2.5 Â 10 À2 mol dm À3 , 10.0 Â 10 À3 mol dm À3 , respectively. Maximum %G was obtained at minimum concentration of xanthan gum i.e., at 40.0 Â 10 À2 g dm À3 and at maximum concentration of PMS i.e., at 10.0 Â 10 À3 mol dm À3 . The optimum temperature and time duration of reaction for maximum % of grafting were found to be 45 C and 120 min respectively. The synthesized graft copolymer was characterized by FTIR analysis. Thermogravimetric analysis showed that the xanthan gum-g-4-vinyl pyridine is thermally more stable than pure gum. A probable mechanism was suggested for the graft copolymerization.

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confidence: 79%

Synthesis and characterization of polysaccharide based graft copolymer by using potassium peroxymonosulphate/ascorbic acid as an efficient redox initiator in inert atmosphere

Kumar¹,

Srivastava²,

Behari³

2009

J of Applied Polymer Sci

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“…1,19,26 On the other hand, 4-VP had a high affinity for its homopolymer substrate, which meant that the homopolymerization occurred in the polymer phase to a large extent. Thus, it is likely that homopolymerization had more chances to occur, and as a result, a decrease in G% and E% was observed.…”

Section: -Vp/kgm Graft Copolymerizationmentioning

confidence: 98%

“…27 Consequently, we concluded that the grafting of 4-VP onto KGM took place at the site of the hydroxyl groups onto the KGM backbone. 19 …”

mentioning

confidence: 97%

Graft copolymerization of 4‐vinyl pyridine onto konjac glucomannan initiated by ammonium persulfate

Liu

Dai

Chen

et al. 2009

J of Applied Polymer Sci

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The grafting of 4-vinyl pyridine (4-VP) onto konjac glucomannan (KGM) by ammonium persulfate (APS) as the initiator was studied in an acid aqueous solution under an inert atmosphere. The grafting ratio (G%) and grafting efficiency (E%) were evaluated comparatively. The dependence of these parameters on the initiator concentration, sulfuric acid concentration, ratio of monomer to KGM, temperature, and reaction time was also investigated. Underperature ¼ 35 C, and time ¼ 120 min, the optimum G% and E% were 307.27 and 52.75%, respectively. The proof of grafting was obtained from thermogravimetric analysis and infrared spectra. Preliminary research of the graft's adsorption capacity for heavy-metal ions [Cr(VI), Cu(II), Pb(II), and Cd(II)] was done.

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“…It should be recognized that although glutaraldehyde is toxic, its toxicity could be reduced significantly after its crosslinking. [11][12][13][14][15][16][17][18][19][20][21] In this investigation, we set out to examine preparation and property of crosslinking GG in order to improve the poor performance of the GG.…”

Section: Introductionmentioning

confidence: 99%

Preparation and property of crosslinking guar gum

Tang

Sun

et al. 2011

Polym J

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The preparation and properties of crosslinking guar gum (GG) were studied by using ethanol as a solvent, epichlorohydrin as a crosslinking agent and sodium hydroxide as a catalyst. Some factors affecting the crosslinking degree of the crosslinked GG were investigated: reaction time, reaction temperature, amount of crosslinking agent, pH and solvent concentration. The sedimentation volume method was selected to determine the crosslinking degree of the crosslinked GG. The crosslinking degree was obviously influenced by the pH, reaction temperature and the crosslinking agent. The crosslinking improved alkali and acid resistance, retrogradation and viscosity stability of GG. The crosslinked GG has a significantly narrower melting transition as compared with GG. Polymer Journal ( It hydrates fairly rapidly in cold water, which gives highly viscous pseudoplastic solutions of generally greater low-shear viscosity. GG and its derivatives served as thickener, stabilizer, blister and flocculant are employed in the food, textile, pharmaceutical and paper industries due to their special properties. [1][2][3][4] Much effort has been devoted to the study of appropriate systems with special properties in order to avoid or minimize the side effects and to improve the efficacy of the therapy in the field of drug delivery in the last decades. Polysaccharides appear to be very attractive for their peculiar physico-chemical characteristics. 5 GG is hydrophilic and swells in cold water, forming viscous colloidal dispersions or sols. This gelling property retards the release of the drug from the dosage form, increasing the likelihood of degradation in the colon. GG was found to be a colon-specific drug carrier in the form of matrix and compression-coated tablets as well as microspheres. The drug is inevitably dissolved, at least partially, because of the high pH level in the stomach. The modification of GG with borax or glutaraldehyde results in a product that is degraded by the enzymatic mixture of galactomannanase and a-galactosidase, possessing a higher buffer-uptake capacity as compared with native GG. The polysaccharides are crosslinked to a sufficient extent that they remain insoluble in water. [6][7][8][9][10] GG can be modified by etherification, esterification, oxidation or graft. The derivatives of GG may compensate for the disadvantages of natural GG. For example, a carboxymethyl derivative may increase the hydrophilicity and solution clarity of the galactomannans and make it more soluble in an aqueous solution. The oxidized GG can be quickly

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Studies on graft copolymerization of 4‐vinylpyridine onto guar gum

Cited by 13 publications

References 13 publications

Synthesis and characterization of polysaccharide based graft copolymer by using potassium peroxymonosulphate/ascorbic acid as an efficient redox initiator in inert atmosphere

Synthesis and characterization of polysaccharide based graft copolymer by using potassium peroxymonosulphate/ascorbic acid as an efficient redox initiator in inert atmosphere

Graft copolymerization of 4‐vinyl pyridine onto konjac glucomannan initiated by ammonium persulfate

Preparation and property of crosslinking guar gum

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