Optimization of substitution degree in synthesis carboxymethyl cellulose from corncobs for application as electrode binder

Abstract

We have synthesized Carboxymethyl Cellulose (CMC) from corncobs with several variations of sodium mono-chloroacetate (Na-MCA). The concentration of Na-MCA in the synthesis process will affect to the substitution degree of CMC. Several materials were used in obtaining CMC from corncobs, such as NaClO2, NaOH, Na-MCA, CH3COOH, ethanol and distilled water. The steps of synthesis consist of cellulose isolation from corncobs, followed by alkalization process, carboxymethylation and finally the purification process. FTIR spectrum of CMC shows the successfully of CMC synthesis, the presence of strong absorption band at 1613 cm-1 and 1411 cm-1 is related to stretching vibration from the carboxyl group (COO-) and carboxyl group as it salts (COO-Na), respectively. Based on FTIR measurement, absorption band at 1613 cm-1 and 1411 cm-1 were increased correspond to the Na-MCA concentrations. The optimal substitution degree of CMC for application as binder of battery electrode is 0.7 which is obtained at concentrations of Na-MCA 8 g per 100 mL solvent.