scholarly journals Synthesis and Characterization Superabsorbent Hydrogels of Partially Neutralized Acrylic Acid Prepared Using Gamma Irradiation; Swelling and Thermal Behavior

2015 ◽  
Vol 15 (3) ◽  
pp. 281-287 ◽  
Author(s):  
Erizal Erizal ◽  
Basril Abbas ◽  
Sulistioso Giat Sukaryo ◽  
Dhena Ria Barleany
Keyword(s):  
Acrylic Acid ◽  
Gamma Radiation ◽  
Thermal Behavior ◽  
Synthesis And Characterization ◽  
Swelling Ratio ◽  
Optimum Conditions ◽  
Dsc Studies ◽  
Large Numbers ◽  
End Products ◽  
Superabsorbent Hydrogels

A series of superabsorbent hydrogels were synthesized from partially neutralized acrylic acid with varying degree of neutralization (0-1) using gamma radiation. The effects of degree neutralization of acrylic acid on swelling ratio were studied. DSC measurement was performed to understand the type of end products resulting from irradiation. The morphologies of the hydrogels were examined using SEM. The chemical changes of the hydrogels were characterized using FTIR. At optimum conditions (10 kGy, 15 min), the hydrogels with neutralization degree 0.5 exhibited rapid swelling with the highest swelling ratio ~1000 g/g. The results of DSC studies confirmed the possible formation of the type hydrogels from irradiated partially neutralized acrylic acid, and the hydrogels showed large numbers of pores from SEM examination.

scholarly journals pH-Sensitive Hydrogel from Polyethylene Oxide and Acrylic acid by Gamma Radiation

2019 ◽  
Vol 3 (2) ◽  
pp. 58 ◽  
Author(s):  
Tania Sabnam Binta Monir ◽  
Sadia Afroz ◽  
Ruhul A. Khan ◽  
Muhammed Yusuf Miah ◽  
Makoto Takafuji ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Gamma Radiation ◽  
Polyethylene Oxide ◽  
Chloride Salt ◽  
Swelling Ratio ◽  
Ph Responsive ◽  
Salt Solutions ◽  
Sem Images ◽  
Gel Content ◽  
Scanning Electron

Hydrogel as a good water absorbent has attracted great research interest. A series of hydrogel based on polyethylene oxide (PEO) and acrylic acid (AAc) was prepared by applying gamma radiation with variation in the concentration of acrylic acid. Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) were used to characterize the PEO/ AAc hydrogel. The properties of the prepared hydrogels such as gel content, swelling behavior, tensile strength, and pH sensitivity were evaluated. The formation of the hydrogels was confirmed from FTIR spectra. SEM images showed the inner porous structure of the hydrogels. The dose of gamma radiation was optimized to get a hydrogel with good swelling property and mechanical strength. The swelling ratio and gel content of the hydrogels were increased with increasing acrylic acid content. The pH of the solutions affected the swelling which indicated the pH-responsive property of the prepared hydrogels. Swelling of the prepared hydrogels in sodium chloride salt solutions decreased with increasing the ionic strength.

scholarly journals SYNTHESIS OF POLY(ACRYLAMIDE-CO-ACRYLIC ACID)-STARCH BASED SUPERABSORBENT HYDROGELS BY GAMMA RADIATION: STUDY ITS SWELLING BEHAVIOR

2012 ◽  
Vol 12 (2) ◽  
pp. 113-118 ◽  
Author(s):  
Erizal Erizal
Keyword(s):  
Acrylic Acid ◽  
Gamma Radiation ◽  
Starch Content ◽  
Swelling Kinetics ◽  
Equilibrium Degree ◽  
Gel Fraction ◽  
Increase Irradiation Dose ◽  
Radiation Study ◽  
Poly Acrylamide ◽  
Superabsorbent Hydrogels

Modification of poly (acrylamide-co-acrylic acid) superabsorbent hydrogels with varying starch concentration (1-3%) via simultaneous gamma radiation have been carried out. The structure and morphology of copolymers were characterization by Fourier transform infra red spectroscopy and scanning electron microscopy. The gel fraction, swelling kinetics and the equilibrium degree of swelling (EDS) of the hydrogels were studied. It was found that the an increase in the starch content present in the hydrogels (1-3%) and with increase irradiation dose  from 10 kGy up to 30 kGy, the swelling ratio decreased from 250-100 g/g. Incorporation of 1% starch increases the EDS of the hydrogels up 350 g/g. Under maximum conditions, poly(AAm-co-AA)-starch hydrogels with high gel fraction (~93%) was prepared from aqueous solution containing 5% AAm, 15% acrylic acid and 0-3% starch. The hydrogels were sensitive against salts solution.

Study on the Superabsorbent Hydrogels Consisting of Crosslinked Acrylic Acid and Nanosized SiO2 Sphere

2013 ◽  
Vol 741 ◽  
pp. 90-93
Author(s):  
Yi Chen ◽  
Yue Peng ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Xiang Gang Li ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Solution Polymerization ◽  
Swelling Ratio ◽  
Atmospheric Conditions ◽  
Swelling Rate ◽  
The Cost ◽  
Superabsorbent Hydrogels

A superabsorbent hydrogels were synthesized by an optimized rapid solution polymerization of concertrated partically neutralized acrylic acid in the presence of an organic crosslinker agent under normal atmospheric conditions, nanosized SiO2 spheres were added into gels to strengthen the gels and decrease the cost. The results showed that, comparing to the inorganic-free hydrogels, the addition of SiO2 spheres cause a sligtly decreased swelling ratio with a faster swelling rate. Meantime, the strength of hydrogels increases 10-20%.

Synthesis and characterization of superabsorbent hydrogels based on hydroxyethylcellulose and acrylic acid

2017 ◽  
Vol 166 ◽  
pp. 300-308 ◽  
Author(s):  
Tamás Fekete ◽  
Judit Borsa ◽  
Erzsébet Takács ◽  
László Wojnárovits
Keyword(s):  
Acrylic Acid ◽  
Synthesis And Characterization ◽  
Superabsorbent Hydrogels

Synthesis and characterization of some polyimide-epoxy composites

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Toheed Akhter ◽  
Humaira Masood Siddiqi ◽  
Zareen Akhter ◽  
M. Saeed Butt
Keyword(s):  
Thermal Behavior ◽  
Epoxy Resins ◽  
Analytical Techniques ◽  
Char Yield ◽  
Epoxy Composites ◽  
Hydroxyl Group ◽  
Synthesis And Characterization ◽  
Tetracarboxylic Acid ◽  
Epoxy Amine

AbstractComposites from some novel polyimide and commercial epoxy were prepared aiming to improve the thermal behavior of epoxy resins. Two diamines namely 4-4'-diamino-4''-hydroxytriphenyl methane (DHTM) and 4-4'- diaminotriphenyl methane (DTM) were synthesized by reacting aniline and aldehydes according to a reported method. The synthesized diamines were blended with commercially available epoxy 1, 4-butanedioldiglycidylether (BDDE) to synthesize model epoxy amine networks which were compared with polyimideepoxy composites. The polyimides were synthesized by reaction of these diamines with aromatic anhydride namely 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride (BTDA). These synthesized polyimides were dispersed in epoxy diamine networks to prepare composites. All the monomers and composites were characterized by making use of various analytical techniques including FTIR, NMR, TGA, DSC and XRD. Presence of hydroxyl group in the diamine helped in better dispersion of polyimide leading to high Tg and high char yield at 600 °C.

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