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In this study, carboxymethyl cellulose (CMC) was prepared using cellulose extracted from palm fiber (CPF). The effect of ozone pretreatment on the CMC properties (degree of substitution (DS) and viscosity) was investigated. Cellulose extracted from CPF was treated with ozone, and then CMC was prepared by alkalization followed by etherification using sodium hydroxide (NaOH) and sodium monochloroacetic acid (NaMCA) in an alcoholic medium. The DS of CMC increased with increasing ozone pretreatment time, and increasing amounts of NaOH and NaMCA added. Furthermore, the solubility increased with increasing DS. Therefore, the solubility increased with ozone pretreatment time. The optimum conditions were ozone pretreatment for 3 h, followed by the addition of 10 mL of 30% NaOH and 4.5 g of NaMCA. Under these conditions, the DS, purity, and solubility were 1.05, 79.6%, and 94.6%, respectively. The viscosity of CMC prepared using cellulose treated with ozone decreased with increasing ozone pretreatment time, which was due to the reduced degree of polymerization. Therefore, using ozone pretreatment for CMC preparation was an effective method for controlling the CMC properties. |
