SINTESIS DAN KARAKTERISASI BIODEGRADABLE HIDROGEL SUPERABSORBEN POLI(KALIUM AKRILAT)-G-GLUKOMANAN DENGAN TEKNIK IRADIASI GAMMA

Abstract

ABSTRAK SINTESIS DAN KARAKTERISASI BIODEGRADABEL HIDROGEL SUPERABSORBEN POLI(KALIUM AKRILAT)-g-GLUKOMANAN DENGAN TEKNIK IRADIASI GAMMA. Telah dilakukan sintesis satu seri hidrogel superabsorben dari campuran asam akrilat yang dinetralkan sebagian (Dn = 0,5) dengan KOH pada beragam konsentrasi glukomanan (0,25 % hingga 1 %) selanjutnya diiradiasi pada dosis 10 kGy (laju dosis 2,5 kGy/jam) pada suhu kamar. Pengaruh konsentrasi glukomanan terhadap kemampuan menyerap air dan fraksi gel hidrogel dipelajari. Perubahan struktur kimia hidrogel diukur menggunakan Fourier Transform Infra Red (FT-IR) dan morfologi permukaan hidrogel diinvestigasi menggunakan Scanning Electron Microscope (SEM). Hasil evaluasi menunjukkan bahwa pada kondisi optimum (0,5 % glukomanan), rasio swelling hidrogel mencapai nilai 800 g/g dan fraksi gel 94,45 %. Hasil analisis FT-IR mengkonfirmasi terjadinya pergeseran gugus fungsi rangkap dari C=C asam akrilat, pengujian SEM menunjukkan permukaaan hidrogel berpori pori besar yang tidak teratur. ABSTRACT SYNTHESIS AND CHARACTERIZATION OF BIODEGRADABLE HYDROGEL SUPERABSORBENT POLY(POTASSIUM ACRYLATE)-g-GLUCOMANNAN BY GAMMA IRRADIATION TECHNIQUE. A series of superabsorbent hydrogels was synthesized from aqueous solution of partially neutralized acrylic acid (Dn = 0.5) with KOH at varied glucomannan concentrations (0.25-1.0 %), followed by gamma irradiation at a single dose of 10 kGy at room temperature. The effects of glucomannan concentration on the water absorption behavior and gel fraction of the obtained hydrogels were studied. Chemical structure of hydrogels were characterized using Fourier transform infrared (FT-IR), while their morphology were examined using scanning electron microscope (SEM). The results showed that glucomannan concentration of 0.5 % was the optimum condition which yielded the highest swelling ratio of ~800 g/g and gel fraction of 94.45 %. The FT-IR spectra analysis indicated that the functional group of acrylic acid C=C double bonds had shifted. SEM micrographs revealed that the surface of hydrogels containing pores with various shape and size.