Synthesis and characterization of novel carboxymethylcellulose hydrogels and carboxymethylcellulolse-hydrogel-ZnO-nanocomposites

Hashem, Mohamed; Sharaf, S.; El‐Hady, M. M. Abd; Hebeish, A.

doi:10.1016/j.carbpol.2013.03.013

Cited by 138 publications

(58 citation statements)

References 26 publications

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“…Crosslinks can be formed by covalent, electrostatic, or hydrophobic bonds, or dipole-dipole interactions [7].…”

Section: Crosslinking Processmentioning

confidence: 99%

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Proposed Cross-Linking Model for Carboxymethyl Cellulose /Starch Superabsorbent Polymer Blend

Braihi¹

2014

IJMSA

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Superabsorbent polymer (SAP) blend has been synthesized from Carboxymethyl Cellulose (CMC) , starch, and aluminum sulfate octadecahydrate cross-linker. Water Absorption Capacity (WAC), FTIR, SEM, DSC, CHO, Flame Photometer and ignition tests are carried out to determine the used CMC formula, investigate the cross-linking process, and suggest a cross-linking model. Flame Photometer results showed there are two sodium acetate groups in the CMC molecule. This result confirmed by theoretical calculations and CHO test . To investigate which of Al 3+ and SO 4 2-ions causes the crosslinking : the extraction of the cross-linked CMC/starch tested with BaCl 2 solution(showed dense white precipitate ; sulfate group not share for blend formation), NaOH solution( showed white precipitate of aluminum hydroxide; Al 3+ ion present (i.e. Al 3+ ion share in the blend structure). These results confirmed by flame test for sodium ion, which showed high Na emission energy (5.75); there is an exchange between Al and Na ions. To check that aluminum is a part of the structure, sample of the cross-linked CMC ignited. A white precipitate appear for aluminum oxide ,which confirms the presence of Al. Based on that there are three CMC molecules connected to each Al atom, theoretical calculations about the amount of Al in the cross-linked CMC molecule showed a good agreement with the CHO results (5.613% Vs. 5.739 % respectively). FTIR spectrum of the cross-linked CMC/starch blend showed that there is a reaction between CMC and starch molecules; i.e. the new repeating unit contains three starch molecules. This conclusion confirmed by theoretical calculations and results of EDX, CHO, and ignition tests. Al% in the new mer appeared a good agreement between theoretical calculations (4.32%) and CHO results (4.512%). Ignition test calculations confirmed that the new mer contains three Al atoms. Evidences of the occurrence of the cross-linking process were obtained from FTIR, morphology, DSC and absorbency results. Absence of the primary hydroxyl alcohol band in the CMC/starch blend spectrum, indicates that this site is active and the reaction between starch and CMC molecules occurs through it. Morphologies studies showed that the sample after crosslinking is more compact than before as well as show one piece for after cross-linking comparing with different pieces before cross-linking.Optimum cross-linking ratio appeared to be 2wt% corresponded to WAC equal to 58 g/g.in distilled water and DSC results indicates that CMC/starch is a miscible blend.

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“…Crosslinks can be formed by covalent, electrostatic, or hydrophobic bonds, or dipole-dipole interactions [7].…”

Section: Crosslinking Processmentioning

confidence: 99%

“…This could be ascribed to decrease flexibility of the chains and the ability of the chains to undergo segmental motion. Diffusion of the hydrolyzing agents (water) into the polymer network also decreases thereby giving rise to more rigid structure of the polymer Network [7].…”

Section: Fig (5)optimum Percent Of Aluminum Sulfate Octedecahydratementioning

confidence: 99%

Proposed Cross-Linking Model for Carboxymethyl Cellulose /Starch Superabsorbent Polymer Blend

Braihi¹

2014

IJMSA

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“…A broad diffraction peak at 2 theta 20° -30° was due to polymer network. The broad reflection shows that ZnO nanoparticles are in nano structured size 16,17 . …”

Section: Xrd Analysismentioning

confidence: 99%

“…ZnO nanoparticles are known for its antimicrobial activity. Incorporation of ZnO in hydrogels shows pH and salt sensitive swelling behaviour 16,17 and enhanced anti microbial activity with less toxicity level. It also shows improved healing rate and collagen deposition ability of composite bandages in wound dressing…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Poly(N-tert-amylacrylamide-co-acrylamide/2-Acrylamido-2-methylpropanesulphonic Acid Sodium Salt) Zinc Oxide Nanocomposite Hydrogels

2018

Chem Sci Trans

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A series of poly(N-tert-amylacrylamide-co-acrylamide/2-Acrylamido-2-methyl propanesulphonic acid) zinc oxide nanocomposite hydrogels were synthesized by free-radical copolymerization in aqueous methanol medium using different monomer ratios at 60 o C with ammonium per sulphate (APS) initiator. N,N'-methylenebisacrylamide (MBA) was used as a crosslinker. The zinc oxide nanocomposite hydrogels were prepared via in situ polymerization using zinc oxide nano particles. The swelling behaviour of ZnO nanocomposite hydrogels were studied by gravimetric method. The degree of swelling was increased by increasing the amount of 2-acrylamido-2-methylpropanesulphonic acid sodium salt. The SEM/EDX images indicate the presence of zinc oxide nano particles in the polymer matrix.

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“…Pores have a role in water absorption of hydrogel. [12] Compact surface morphology will act as a barrier to water diffusion. Hence, Hydrogels P1C4 and P1C3 have swelling ratio characteristics 29% and 25%, respectively.…”

Section: Fig 5 Ftir Spectra Of Hydrogelmentioning

confidence: 99%

Polyvinyl Alcohol (PVA) Partially Hydrolyzed Addition in Synthesis of Natural Hydrogel Carboxymethyl Cellulose (CMC) Based from Water Hyacinth

Saputra

Apriliana

2018

MATEC Web Conf.

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Abstract. There are many benefits from Indonesia's biodiversity. One of them is cellulose of Water hyacinth. Water hyacinth contains 60 % cellulose. Cellulose of water hyacinth can be used as material for polymer product such as hydrogel. Hydrogel is a hydrophilic superabsorbent polymer that can absorb water until 200 times from its weight without dissolved in water. In synthesis of hydrogel, the cellulose should be modified to Carboxymethyl Cellulose (CMC) by alkalization and carboxymethylation process in reaction media ethanol and isopropanol (2:8). The aim of the study is to obtain the hydrogel with high swelling ratio characteristic by adding Polyvinyl Alcohol (PVA) Partially Hydrolyzed with variation of PVA/CMC composition (20:80, 80:20, 50:50, 25:75 and 75:25). The optimum PVA/CMC composition are 20:80 and 25:75 which give results 29% and 25% in their swelling ratio. This low swelling ratio is caused by morphology structure of hydrogel that has a compact structure and small pores. This structures lead to difficulity in water diffusion. In compare with hydrogel from PVA Fully Hydrolyzed addition, hydrogel with PVA Partially Hydrolyzed addition contain vinyl acetate that cause hydrogel less hydrophilic and has a low value on liofil-hidrophilic balance.

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Synthesis and characterization of novel carboxymethylcellulose hydrogels and carboxymethylcellulolse-hydrogel-ZnO-nanocomposites

Cited by 138 publications

References 26 publications

Proposed Cross-Linking Model for Carboxymethyl Cellulose /Starch Superabsorbent Polymer Blend

Proposed Cross-Linking Model for Carboxymethyl Cellulose /Starch Superabsorbent Polymer Blend

Synthesis and Characterization of Poly(N-tert-amylacrylamide-co-acrylamide/2-Acrylamido-2-methylpropanesulphonic Acid Sodium Salt) Zinc Oxide Nanocomposite Hydrogels

Polyvinyl Alcohol (PVA) Partially Hydrolyzed Addition in Synthesis of Natural Hydrogel Carboxymethyl Cellulose (CMC) Based from Water Hyacinth

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