Synthesis of Poly(acrylamide-Co-Acrylic Acid)-Starch Based Superabsorbent Hydrogels by Gamma Radiation: Study Its Swelling Behavior

Abstract

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.

Fast Swelling Superabsorbent Hydrogels Starch Based Prepared by Gamma Radiation Techniques

“…It is strongly suspected as the optimum dose range for the relatively large of the rate of absorption of hydrogels in this study. This is confirmed by our previous studies with increasing irradiation dose above 15 kGy caused the rate of absorption of the hydrogel decreased [10]. This is due to increasing irradiation doses, the density of crosslinked hydrogels increase and decreasing the rate of water absorption.…”

“…In addition, the acrylic acid containing carboxylic groups (COOH) as hydrophilic groups is easily binding with water molecules to form hydrogen bonds with water. Some researchers reported that acrylic acidbased superabsorbent hydrogel absorbs large amount of water with the rate swelling in the range of minutes, hours and days [10,[12][13][14]. Hence, it is indicated that the combination of starch with AAM-AA in the powder form of hydrogel prepared at a low irradiation dose (7.5 kGy) when compared with granular form (previous work) were greatly improved the capacity of hydrogels to absorb water.…”

“…solution by radiation crosslinking with varying irradiation doses (7.5-12.5 (7,(5)(6)(7)(8)(9)(10)(11)(12)5 …”

“…In previous work, the swelling behavior of poly(AAM-AA)-starch hydrogels containing 5% AAm, 15% acrylic acid with varying starch concentration (1-3%) synthesized by gamma radiation at different doses (10-30 kGy) were studied [10]. We found that incorporation of 1% starch content present in hydrogel irradiated at a dose 10 kGy, the maximum swelling ratio of hydrogel in the granular form was 350 g/g and reached at 24 h. For the application, especially as absorbents incorporated in the baby napkins, this HSA is not applicable because its swelling rate is a low.…”

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ABSTRACT

Fast swelling hydrogels were synthesized from the mixture of acrylamide (AAM)-acrylic acid (AA)-starch (15:5:1 w/v) solution by radiation crosslinking with varying irradiation doses (7.5-12.5 (7,(5)(6)(7)(8)(9)(10)(11)(12)5

ABSTRAK

Hidrogel dengan kemampuan swelling yang relatif cepat disintesis dari campuran larutan akrilamida (AAM)-asam akrilat (AA)-pati (15:5:1) menggunakan iradiasi gamma pada beragam dosis iradiasi

kGy). Kopolimer dikarakterisasi menggunakan Fourier Transform infra red (FTIR) dan Differential scanning calorimetry (DSC

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