scholarly journals PREPARATION OF CARBOXYMETHYL CELLULOSE AND POLYVINYL ALCOHOL (CMC/PVA) HYDROGELS USING FREEZE−THAW PROCESSES FOR ADSORPTION OF Zn2+ AND Cu2+

2021 ◽  
Vol 55 (3-4) ◽  
pp. 375-383
Author(s):  
NEDA PAVANDI ◽  
ELHAM TAGHAVI ◽  
NAVIDEH ANARJAN
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Numerical Optimization ◽  
Polynomial Equations ◽  
Swelling Ratio ◽  
Process Variables ◽  
Freeze Thaw ◽  
Gel Fraction ◽  
Zero Order Kinetics ◽  
Order Polynomial

"The preparation of carboxymethyl cellulose and polyvinyl alcohol (CMC/PVA) composites is proposed in the present work. The CMC/PVA hydrogels were prepared using freeze−thaw processes. The effects of freezing time and of the number of freeze−thaw cycles on the swelling ratio and gel fraction of achieved hydrogels were evaluated using response surface methodology. The multiple regression analysis suggested second order polynomial equations as models for predicting changes of the studied hydrogel characteristics by selected process variables, with relatively high coefficients of determination (R2 > 0.82). The numerical optimization suggested that freezing the polymer solutions for 5 h and repeating the freeze−thaw process for 5 times would give the most desirable hydrogels with highest either swelling ratio or gel fraction. Remarkably, the ion adsorption studies showed that the adsorption of Cu2+ and Zn2+ ions by the hydrogels obeys zero order kinetics and the high capability of the produced optimum hydrogels to adsorb selected ions from synthetic waste was confirmed."

scholarly journals Preparation Of Carboxymethyl Cellulose/Acrylamide Copoly-Mer Hydrogel Using Gamma Radiation And Investigation Of Its Swelling Behavior

2013 ◽  
Vol 25 (2) ◽  
pp. 132-138 ◽  
Author(s):  
S Sultana ◽  
MR Islam ◽  
NC Dafader ◽  
ME Haque
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Carboxymethyl Cellulose ◽  
Saline Solution ◽  
Chemical Society ◽  
Swelling Ratio ◽  
Swelling Properties ◽  
Preparation Conditions ◽  
Maximum Value ◽  
Gel Fraction

Acrylamide (AAm)/carboxymethyl cellulose (CMC) blend hydrogels have been prepared by the application of gamma radiation from C0-60 source at room temperature (27°C). The preparation conditions such as effect of CMC concentration and radiation dose on gel fraction and swelling behaviors were investigated. The maximum value of gel fraction is obtained at 25 kGy radiation dose. The swelling properties were investigated in distilled water, saline solution (NaCl) and buffer medium. The maximum swelling value of hydrogel was obtained at 48 hours in water. The swelling ratio of hydrogel decreased with increase in concentration of NaCl in swelling medium. In buffer, it was found that swelling ratio increased with increase in pH of medium. Journal of Bangladesh Chemical Society, Vol. 25(2), 132-138, 2012 DOI: http://dx.doi.org/10.3329/jbcs.v25i2.15065

scholarly journals Properties of Sodium Alginate–Polyvinyl Alcohol Hydrogels Irradiated By Gamma Ray For Wound Dressing Materials

2013 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
Thamrin Wikanta ◽  
Erizal Erizal
Keyword(s):  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Wound Dressing ◽  
Irradiation Dose ◽  
Gamma Ray ◽  
Ph Value ◽  
Suitable Condition ◽  
Water Evaporation ◽  
Swelling Ratio ◽  
Gel Fraction

A copolymer of sodium alginate (SA)–polyvinyl alcohol (PVA) was synthesized by gamma irradiation  to  make  a  hydrogel  and  study  on its properties has been carried out. A  series of 0.5% -2.0% (w/v) of SA solution and 10% (w/v) of PVA solution were prepared in separate tubes. Each of the SA solution was mixed with PVA solution, then it was irradiated with gamma ray at the doses of 30 kGy, 40 kGy, and 50 kGy (dose rate of 10 kGy/hour), respectively. The properties of hydrogels were evaluated comprising of the physical performance, gel fraction, swelling ratio, water evaporation, and pH. The results showed that increase of irradiation dose can increase the gel fraction, but  increase of SA concentration can decrease the gel fraction. SA concentration of 1-2% with gamma ray irradiation dose of 30 kGy was a suitable condition to produce a good hydrogel with properties as follow, gel fraction of 75.83%-78.70%, swelling ratio of 69.12-80.14 g/g, and maximum water evaporated of 54.21-76.41%, the pH value ranged 5.60-5.65. The hydrogels produced are suitable to be used for  wound dressing, especially for wet wounds, and can be applied for two days.

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

2018 ◽  
Vol 156 ◽  
pp. 01007 ◽  
Author(s):  
Asep Handaya Saputra ◽  
Nadia Huda Apriliana
Keyword(s):  
Polyvinyl Alcohol ◽  
Vinyl Acetate ◽  
Carboxymethyl Cellulose ◽  
Water Hyacinth ◽  
Water Diffusion ◽  
Superabsorbent Polymer ◽  
Swelling Ratio ◽  
Compact Structure ◽  
Polymer Product ◽  
Reaction Media

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.

Enhanced functional properties of biodegradable Polyvinyl alcohol /carboxymethyl cellulose (PVA/CMC) composite films reinforced with L-alanine surface modified CuO nanorods

2021 ◽  
Author(s):  
Yamanappagouda Amaregouda ◽  
Kantharaju Kamanna ◽  
Tilak Gasti ◽  
Vijay Kumbar
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Soil Burial ◽  
High Antibacterial Activity ◽  
Active Food Packaging ◽  
Surface Modified ◽  
Cuo Nanorods

Abstract Herein, we described novel biogenic preparation of the CuO nanorods and its surface modification with L-alanine amino acid accelerated by microwave irradiation. The effect of surface functionalized CuO nanorods on the polyvinyl alcohol/carboxymethyl cellulose film physico-mechanical properties were investigated through various characterization techniques. The tensile strength was improved from 28.58 ± 0.73 MPa to 43.40 ± 0.93 MPa, UV shielding ability and barrier to the water vapors were highly enhanced when PVA/CMC matrices filled with 8 wt% of CuO-L-alanine. In addition, the prepared films exhibited acceptable overall migration limit and readily undergoes soil burial degradation. Nevertheless, CuO-L-alanine incorporated films showed potent antioxidant activity against DPPH radicals and had high antibacterial activity against Staphylococcus aureus and Escherichia coli, and antifungal activity against Candida albicans and Candida tropicalis. Furthermore, the nanocomposite films showed negligible cytotoxic effect on HEK293 and Caco-2 cell lines. In these contexts, the developed nanocomposite films can be implementing as an active food packaging material.

Efficiency of Application of Hydrolyzed Polyacrylamide and Copolymer Acrylamide with Potassium Acrylate as a Water-Swelling Agent in Rubbers

2019 ◽  
Vol 816 ◽  
pp. 208-213
Author(s):  
Svetlana S. Lopatina ◽  
M.A. Vaniev ◽  
N.V. Sychev ◽  
D.A. Nilidin ◽  
Y.Yu. Savchenko ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Carboxymethyl Cellulose ◽  
Sodium Carboxymethyl Cellulose ◽  
Butadiene Rubber ◽  
Swelling Ratio ◽  
Nitrile Butadiene Rubber ◽  
Swelling Agent ◽  
Water Swelling ◽  
Hydrolyzed Polyacrylamide

This paper reviews water swelling of rubber, based on nitrile-butadiene rubber, modified by polyacrylamide and copolymer acrylamide with potassium acrylate, also their combination with sodium-carboxymethyl cellulose. During the exposure for 14 days at a temperature of 67 °С swelling ratio in water is 200 % and 47 % in 10 % aqueous solution of sodium chloride.

Composite Films Based on Polyvinyl Alcohol and Na-Carboxymethyl Cellulose for Separation

2020 ◽  
Vol 93 (7) ◽  
pp. 1003-1008
Author(s):  
G. G. Arakelov ◽  
K. S. Smirnova ◽  
A. G. Nichvolodin ◽  
S. D. Khizhnyak ◽  
A. V. Sokolov ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Composite Films

Synthesis of Glutaraldehyde-Crosslinked Carboxymethyl Cellulose-Polyvinyl Alcohol Film as an Adsorbent for Methylene Blue

2020 ◽  
Vol 840 ◽  
pp. 35-42
Author(s):  
Dwi Siswanta ◽  
Rizky Wahyuni ◽  
Mudasir Mudasir
Keyword(s):  
Methylene Blue ◽  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Contact Time ◽  
Order Kinetic ◽  
Casting Technique ◽  
Sem Image ◽  
Ftir Characterization ◽  
Desorption Study ◽  
Polyvinyl Alcohol Film

The glutaraldehyde (GA)-crosslinked carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA) film had been synthesized and used as a methylene blue adsorbent. The films were prepared using a solution casting technique and characterized using FTIR spectrophotometer, SEM. Adsorption studies include pH, contact time, methylene blue initial concentration. Furthermore, the desorption study of films was carried out using NaCl, HCl and distilled water. The results of FTIR characterization showed similarities between the spectra of CMC-PVA-GA films with their component materials. The SEM image of CMC-PVA-GA films showed a non-porous surface. In the adsorption study, GA-crosslinked CMC-PVA films (1:2 w/w) exhibited the largest adsorption capacity of methylene blue at optimum conditions for adsorption at pH 7, contact time 200 min, methylene blue concentration of 200 mg L–1 which was 194 mg g–1. Methylene blue adsorption kinetic followed the pseudo second-order kinetic model and the Langmuir adsorption isotherm model. The desorption studies show that adsorption takes place through an ion exchange mechanism.

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