Graft copolymerization of sodium salt of partially carboxymethylated guar gum with methyl methacrylate: An examination of the reaction variables

Trivedi, Jignesh; Kalia, Kiran; Patel, Niraj H.; Trivedi, H. C.

doi:10.1002/app.21345

Cited by 22 publications

(14 citation statements)

References 13 publications

(15 reference statements)

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“…1 indicated esterification by the emergence of a peak at 1735-1750 cm -1 attributed to C=O stretching, indicating the presence of the acetyl group. The peak observed for GG at 1650 cm -1 has been attributed to the hydration of the GG molecule 25 . On acetylation this peak was seen to decrease and in the case of AGG (0.56) the peak was not resolved from that of the C=O group.…”

Section: Resultsmentioning

confidence: 98%

Preparation of Acetylated Guar Gum – Unsaturated Polyester Composites & Effect of Water on Their Properties

D’Melo¹,

Sabnis²,

Shenoy³

et al. 2012

CCL

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Guar gum has seen extensive use in blends, however, its application as a filler in thermoset composites has as yet not been investigated. The effect of the addition of guar gum and its acetyl derivatives on the kinetics of water diffusion in unsaturated polyester composites was studied. The effect of water on the mechanical properties of the composites was studied with respect to the nature of filler, filler concentration and time of immersion. All the mechanical properties were observed to decrease on exposure to water. Further, it was observed that acetylated guar gum, with a degree of substitution of 0.21, showed the best mechanical properties, surpassing the other filled composites and that of the pure unsaturated polyester. Thus, acetylated guar gum showed promise as eco-friendly filler in composite formulation.

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Section: Resultsmentioning

confidence: 98%

Preparation of Acetylated Guar Gum – Unsaturated Polyester Composites & Effect of Water on Their Properties

D’Melo¹,

Sabnis²,

Shenoy³

et al. 2012

CCL

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“…Similar results can also be found in the literature. 19,21,28,29 Characterization of the graft copolymers of NaCMC with N-VP…”

Section: Effect Of the Nacmc Concentrationmentioning

confidence: 99%

Graft copolymerization of N‐vinyl‐2‐pyrrolidone onto sodium carboxymethylcellulose with azobisisobutyronitrile as the initiator

Yi̇ği̇toğlu

Işıklan

Özmen

2007

J of Applied Polymer Sci

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Graft copolymers of sodium carboxymethylcellulose with N-vinyl-2-pyrrolidone were prepared in aqueous solutions with azobisisobutyronitrile as the initiator. The graft copolymers [sodium carboxymethylcellulose-g-poly(N-vinyl-2-pyrrolidone)] were characterized with Fourier transform infrared spectroscopy, elemental analysis, nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and scanning electron microscopy. The grafting parameters, including the graft yield of the graft copolymer and the grafting efficiency of the reaction, were evaluated comparatively. The effects of reaction variables such as the time, temperature, and monomer and initiator concentrations on these parameters were studied. The graft yield and grafting efficiency increased and then decreased with increasing concentrations of N-vinyl-2-pyrrolidone and azobisisobutyronitrile and increasing polymerization temperatures. The optimum temperature and polymerization time were 708C and 4.30 h, respectively. Further changes in the properties of grafted sodium carboxymethylcellulose, such as the intrinsic viscosity, were determined. The overall activation energy for the grafting was also calculated to be 10.5 kcal/mol. 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 936-943, 2007

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“…The reaction conditions led to a reduction in the molecular weight of the polymer molecules, as reflected by the reduced solution viscosity of the HPGs in Table I. It has been shown that as the molecular weight of a polymer is decreased, its degradability increased 21, 22. The propoxylation of GG has the effect of increasing the hydrophobic character of the polymer; alkoxylation has been reported to alter degradation characteristics of various compounds 23.…”

Section: Resultsmentioning

confidence: 98%

Evaluation of biodegradability of epoxy‐guar gum composites

D’Melo

Shenoy

2009

J of Applied Polymer Sci

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Epoxy composites incorporating natural components have been mainly limited to the use of natural fibers. However, there have been a few instances where polysaccharides have been used as particulate fillers in thermoset compositions. The present study investigated the effect of guar gum/hydroxypropyl guar gum as a filler on the degradative properties of epoxy composites at various filler concentrations, with reference to fungal degradation and soil burial tests. It was found that at higher filler concentrations, the degradation increased. Composites based on hydroxypropyl guar gum showed increased degradation initially but on prolonged exposure to the fungal environment, the difference between guar gum and the hydroxypropyl guar gum-based composites was found to be marginal. Microscopic evaluation of the composites showed that the degradation occurred at both the composite surface and in the bulk.

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Graft copolymerization of sodium salt of partially carboxymethylated guar gum with methyl methacrylate: An examination of the reaction variables

Cited by 22 publications

References 13 publications

Preparation of Acetylated Guar Gum – Unsaturated Polyester Composites & Effect of Water on Their Properties

Preparation of Acetylated Guar Gum – Unsaturated Polyester Composites & Effect of Water on Their Properties

Graft copolymerization of N‐vinyl‐2‐pyrrolidone onto sodium carboxymethylcellulose with azobisisobutyronitrile as the initiator

Evaluation of biodegradability of epoxy‐guar gum composites

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