Preparation of Synthetic Hydrogel Sheets of Poly(sodium 2-acrylamido-2-methylpropane sulfonate) Containing Extracts from Krueo Ma Noy Leaves

Ratthaphat Bunkerd; Sasidhorn Innok; Runglawan Somsunan; Robert Molloy

Authors

Ratthaphat Bunkerd Program of Applied Chemistry, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, Thailand
Sasidhorn Innok Program of Applied Biology, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, Thailand
Runglawan Somsunan Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
Robert Molloy Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand

Keywords:

Poly(sodium 2-acrylamido-2-methylpropane sulfonate), Krueo Ma Noy leaves extracts, hydrogel, photopolymerization, interpenetrating polymer network

Abstract

The aim of this research was to study the preparation of synthetic hydrogel sheets of poly(sodium 2-acrylamido-2-methylpropane sulfonate (P(Na-AMPS)) containing extracts from Krueo Ma Noy leaves. The sheets were prepared using Na-AMPS monomer at a concentration of 40% w/v in water and Krueo Ma Noy extract at a concentration of 2.25% w/v in various % v/v ratios of 100:0, 95:5, 90:10 and 85:15. Each solution mixture was photopolymerized under UV-C at a wavelength of 250 nm using 2-hydroxy-4’-(2-hydroxyethoxy-2-methylpropiophenone) at a concentration of 0.05 mol% as photoinitiator and N,N-methylene-bis-acrylamide at a concentration of 1 mol% as crosslinking agent. The final product was a full interpenetrating polymer network hydrogel sheet. Structural characterization of the hydrogel was carried out by means of Fourier-transform infrared (FT-IR) spectroscopy and thermogravimetric analysis. Polymerization was confirmed by the disappearance of the C=C peaks of the Na-AMPS monomer at 1420 and 970 cm^-1 in the FT-IR spectra. Property testing of the hydrogel sheets showed that the sheets with the best properties in terms of gel fraction, water retention and mechanical properties were obtained from the 85:15% v/v solution mixture.

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