Evaluation of Graft Copolymerization of Acrylic Monomers Onto Natural Polymers by Means Infrared Spectroscopy

Rivera‐Armenta, José Luis; Flores-Hernández, Cynthia Graciela; Angel-Aldana, Ruth Zurisadai Del; Mendoza-Martínez, Ana María; Velasco‐Santos, Carlos; Martínez-Hernández, Ana Laura

doi:10.5772/36322

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…During the last decade, an increasing amount of research has been published involving keratin fibers from chicken feather with synthetic polymers, such as grafting with polymethylmethacrylate [19,20] and polyhydroxyethylmethacrylate [21]; composites with polyethylene [22,23], polypropylene [24][25][26], polymethylmethacrylate [27], polyurethane [28] and phenol-formaldehyde [29], among others [18], however there are only few related to keratin fibers and biopolymers [30,31].…”

Section: Introductionmentioning

confidence: 99%

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

et al. 2014

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Abstract:The performance as reinforcement of a fibrillar protein such as feather keratin fiber over a biopolymeric matrix composed of polysaccharides was evaluated in this paper. Three different kinds of keratin reinforcement were used: short and long biofibers and rachis particles. These were added separately at 5, 10, 15 and 20 wt% to the chitosan-starch matrix and the composites were processed by a casting/solvent evaporation method. The morphological characteristics, mechanical and thermal properties of the matrix and composites were studied by scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry and dynamic mechanical analysis. The thermal results indicated that the addition of keratin enhanced the thermal stability of the composites compared to pure matrix. This was corroborated with dynamic mechanical analysis as the results revealed that the storage modulus of the composites increased with respect to the pure matrix. The morphology, evaluated by scanning electron microscopy, indicated a uniform dispersion of keratin in the chitosan-starch matrix as a result of good compatibility between these biopolymers, also corroborated by FTIR. These results demonstrate that chicken feathers can be useful to obtain novel keratin reinforcements and develop new green composites providing better properties, than the original biopolymer matrix.

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Section: Introductionmentioning

confidence: 99%

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

et al. 2014

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“…Optimum reaction conditions obtained were: reaction time, 5 min; reaction temperature, 80 C; initiator ratio, 0.5 : 1.0; solvent volume, 10 ml; pH of medium, 7.0 and HEMA, 1.23 Â 10 À4 mol L À1 ( Fig. [100][101][102] Graing of HEMA onto H. antidysenterica has been found to give 422.0% gra yield which is quite good in comparison to graing of HEMA onto other natural backbones. Initially with increase in reaction temperature, reaction time and pH of medium percentage graing was found to increase upto critical limit.…”

Section: Resultsmentioning

confidence: 99%

“…99 HEMA has been found to be a potent vinyl monomer for graing onto bio-polymers and better gra yields have been reported by various workers. [100][101][102] Graing of HEMA onto H. antidysenterica has been found to give 422.0% gra yield which is quite good in comparison to graing of HEMA onto other natural backbones. A Comparative study of the gra copolymerization of HEMA onto cellulosics vis-a-vis MHa-g-poly (HEMA) is given in Table 1.…”

Section: Gra Copolymerizationmentioning

confidence: 99%

Synthesis and characterization of MHa-g-poly(HEMA)PO₄²⁻2H⁺ cation exchanger-effective removal of methylene blue from waste water

Kaith

Dhiman

Bhatia³

2015

RSC Adv.

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Poly(HEMA) chain grafted chemically modified Holarrhena antidysenterica fiber was converted into a cation-exchanger using phosphorylation and a p-doping technique. The cation-exchanger synthesized was found to remove about 94.6% methylene blue dye from aqueous solution. The graft copolymer and cation exchanger vis-a-vis the backbone were characterized using different techniques like FTIR, SEM, EDX and XRD. The samples were further evaluated for thermal behavior using TGA/DTA/DTG techniques.The synthesized cation-exchanger was found to possess high thermal stability.

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“…Tartaric acid (peak at 1086 cm -1 ) was present at 5-10%, according to the manufacturer's material's safety data sheet (MSDS) in commercial materials, and at 5% in the home and experimental liquids. HPM showed an additional peak at 1059 cm -1 corresponding to the C-OH group in its structure, while HEMA and THFM showed additional peaks at ~1020 and 1086 cm -1 , corresponding to the C-O-H group in HEMA's structure and the ring stretch in THFM (25,26).…”

Section: Composition Analysismentioning

confidence: 99%

Polymerization shrinkage kinetics and degree of conversion of commercial and experimental resin modified glass ionomer luting cements (RMGICs)

2020

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Objective. Tetrahydrofurfuryl-methacrylate (THFM) and hydroxypropyl-methacrylate (HPM) were used to partially or fully replace HEMA in experimental RMGICs. The experimental materials were compared with home and commercial products in terms of degree of conversion, polymerization shrinkage and exotherm. Methods. Two commercial RMGICs used were Fuji-Plus (GC, Japan) and RelyX-Luting (RX, 3M-ESPE, USA). Two additional in-house liquids were prepared based on the commercial materials liquids. Eight experimental liquid compositions (F1, F2, F3 and F4 based on Fuji-Plus; R1, R2, R3 and R4 based on RelyX-Luting) were prepared replacing 100% HEMA with HPM in F1 and R1 or HPM/THFM in F2 and R2. 50% HEMA was replaced with THFM in F3 and R3 compared to 30% in F4 and R4. All liquids were mixed with the corresponding commercial powder. Degree of conversion was determined using Fourier-transform infrared spectroscopy (FT-IR). Polymerization shrinkage and exotherm were measured using the bonded-disk method. Results. Compositions containing HPM (FP and RX) showed lower degree of conversion compared to experimental compositions containing THFM, home and commercial materials (p<0.0001). FP-commercial showed significantly higher polymerization shrinkage and exotherm compared to all other materials in both groups (p<0.0001). FP-commercial showed higher degree of polymerization shrinkage and exotherm at 5 minutes compared to all materials due to the incorporation of an additional cross-linker (glycerol-dimethacrylate). In general, compositions containing THFM, presented polymerization shrinkage and degree of conversion values similar to their corresponding commercial products. Significance. THFM monomer showed promising results and could be potentially useful in the development of new RMGICs with improved properties.

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Evaluation of Graft Copolymerization of Acrylic Monomers Onto Natural Polymers by Means Infrared Spectroscopy

Cited by 7 publications

References 21 publications

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

Synthesis and characterization of MHa-g-poly(HEMA)PO₄²⁻2H⁺ cation exchanger-effective removal of methylene blue from waste water

Polymerization shrinkage kinetics and degree of conversion of commercial and experimental resin modified glass ionomer luting cements (RMGICs)

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Evaluation of Graft Copolymerization of Acrylic Monomers Onto Natural Polymers by Means Infrared Spectroscopy

Cited by 7 publications

References 21 publications

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

All Green Composites from Fully Renewable Biopolymers: Chitosan-Starch Reinforced with Keratin from Feathers

Synthesis and characterization of MHa-g-poly(HEMA)PO42−2H+ cation exchanger-effective removal of methylene blue from waste water

Polymerization shrinkage kinetics and degree of conversion of commercial and experimental resin modified glass ionomer luting cements (RMGICs)

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Synthesis and characterization of MHa-g-poly(HEMA)PO₄²⁻2H⁺ cation exchanger-effective removal of methylene blue from waste water