The Synthesis of Superabsorbent Polymer from Carboxymethyl Selulose, Aluminum Sulfate and Oxidized Bread Fruit Starch

Abstract

Superabsorbent polymers (CMC-Al-BSM) were synthesized from aqueous solutions of sodium carboxymethyl cellulose (CMC), aluminum sulfateoctadecahydrate (Al) and oxidized bread fruit starch (BSM). BSM is obtained by oxidizing the starch (BS) with2% hydrogen peroxide solution. CMC-Al-BSM was preparedby mixing 100 mL of 2% Na-CMC solution and 50 mL of 2% BSM solution, stirring with a magnetic stirrer for 60 minutes at 800C and then adding 0.01 g of aluminum sulphate and stirring for 30 minutes. The mixture formed is poured onto Teflon and dried at 70 ° C until the film is formed and then the film formed is made as a powder. The same experiment was carried out with variations in the weight of aluminum sulfate 0.03 and 0.06 g. BS and BSM are characterized by measuring the carboxyl group content, recording the FTIR spectrum and morphological analysis with SEM. CMC-Al-BSM is characterized by measuring WAC by tea bag method, surface morphology with SEM and Tg with DSC. Based on the calculation, the carboxyl group content of BSM that obtained is 0,09 % and SEM Photograph shows that the BSM particle size is smaller than the BS particle size. The optimum water absorption capacity of SAP is obtained at CMC-Al3-BSM which reaches 8330% (in 1.0 g dry weight of CMC-Al3-BSM can absorb 83.3 g of water). SEM photograph also shows that the surface morphology of CMC-Al3-BSM is more homogeneous and smooth than other SAP compositions and from DSC analysis it can be concluded that CMC-Al3-BSM is a miscible mixture