Grafting onto Gelatin. II. Graft Copolymerization of Ethyl Acrylate and Methyl Methacrylate onto Gelatin in the Presence of Ce4+ as Redox Initiator

Khetarpal, R. C.; Gill, Kiran Dip; Mehta, I. K.; Misra, Β. N.

doi:10.1080/00222338208056514

Cited by 19 publications

(1 citation statement)

References 13 publications

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“…Grafting onto and from polypeptides with low SH group contents during free radical polymerization of acrylic and methacrylic monomers has been frequently reported. Persulfate, in particular, has been effective as an initiator in promoting the formation of graft copolymers from gelatin [ 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 ], casein [ 86 ], silk [ 87 , 88 ], etc. The most commonly proposed mechanism involves the abstraction of hydrogen radicals from functional groups present on the protein (e.g., -COOH, -NH2, -OH and -SH) by the initiator or radicals on the growing polyacrylic chains.…”

Section: Resultsmentioning

confidence: 99%

Keratin–PNIPAM Hybrid Microgels: Preparation, Morphology and Swelling Properties

Buratti,

Sguizzato,

Sotgiu

et al. 2024

Gels

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Combinations of synthetic polymers, such as poly(N-isopropylacrylamide) (PNIPAM), with natural biomolecules, such as keratin, show potential in the field of biomedicine, since these hybrids merge the thermoresponsive properties of PNIPAM with the bioactive characteristics of keratin. This synergy aims to produce hybrids that can respond to environmental stimuli while maintaining biocompatibility and functionality, making them suitable for various medical and biotechnological uses. In this study, we exploit keratin derived from wool waste in the textile industry, extracted via sulfitolysis, to synthesize hybrids with PNIPAM microgel. Utilizing two distinct methods—polymerization of NIPAM with keratin (HYB-P) and mixing preformed PNIPAM microgels with keratin (HYB-M)—resulted in hybrids with 20% and 25% keratin content, respectively. Dynamic light scattering (DLS) and transmission electron microscopic (TEM) analyses indicated the formation of colloidal systems with particle sizes of around 110 nm for HYB-P and 518 nm for HYB-M. The presence of keratin in both systems, 20% and 25%, respectively, was confirmed by spectroscopic (FTIR and NMR) and elemental analyses. Distinct structural differences were observed between HYB-P and HYB-M, suggesting a graft copolymer configuration for the former hybrid and a complexation for the latter one. Furthermore, these hybrids demonstrated temperature responsiveness akin to PNIPAM microgels and pH responsiveness, underscoring their potential for diverse biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Keratin–PNIPAM Hybrid Microgels: Preparation, Morphology and Swelling Properties

Buratti,

Sguizzato,

Sotgiu

et al. 2024

Gels

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Graft copolymerization of methyl methacrylate upon gelatin initiated by benzoyl peroxide in aqueous medium

Keleş

Çeli̇k

Saçak

et al. 1999

J. Appl. Polym. Sci.

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The graft copolymerization of methyl methacrylate upon gelatin was studied using benzoyl peroxide as an organic initiator in aqueous medium. The grafting reactions were carried out within the 65–90°C temperature range, and the effect of monomer and initiator concentrations on the graft yield were also investigated. The maximum graft yield was obtained at a benzoyl peroxide concentration of 0.20 × 10−2 mol/L and the optimum temperature was 80°C. Thermogravimetric analysis showed that the thermal stability of gelatin increased as a result of grafting. Further, such changes in the properties of methyl methacrylate‐grafted gelatin as density, moisture regain, and water uptake were also determined. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1547–1556, 1999

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Ceric‐induced grafting of ethyl‐acrylate onto sodium alginate

Shah

Patel

Trivedi

1994

Angew. Makromol. Chem.

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Sodium alginate was graft‐copolymerized with ethyl acrylate using ceric ammonium nitrate as an initiator. In order to optimize the conditions for grafting, the concentrations of nitric acid, initiator and monomer together with temperature, time and amount of substrate were varied. The kinetic scheme of free radical graft copolymerization has been proposed and the equations relating the values of rate of polymerization, rate of graft copolymerization and rate of homopolymerization are also suggested. The experimental results agree very well with the proposed kinetic scheme.

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Grafting onto Gelatin. II. Graft Copolymerization of Ethyl Acrylate and Methyl Methacrylate onto Gelatin in the Presence of Ce4+ as Redox Initiator

Cited by 19 publications

References 13 publications

Keratin–PNIPAM Hybrid Microgels: Preparation, Morphology and Swelling Properties

Keratin–PNIPAM Hybrid Microgels: Preparation, Morphology and Swelling Properties

Graft copolymerization of methyl methacrylate upon gelatin initiated by benzoyl peroxide in aqueous medium

Ceric‐induced grafting of ethyl‐acrylate onto sodium alginate

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