Cellulose derivatives as solid electrolyte matrixes

Cellulose derivatives like hydroxyethylcellulose (HEC) and carboxymethylcel lulose (CMC) were submitted to the graftization reactions. The samples of H EC were grafted with monoisocyanate of poly(propylene oxide) (MPPO) and dif ferent diisocyanates of poly(ethylene oxide) (DPEO) and poly(propylene oxid e) (DPPO) in the presence of LiClO4. CMC was grafted with MPPO. These polys sacharides based samples were characterized by IR, NMR and thermal analysis (DSC and TGA). The samples of grafted polyssacharides derivatives showed g lass transition temperatures (Tg) of -40 degreesC for HEC/MPPO, -33 degrees C for HEC/DPEO, -10 degreesC for HEC/DPPO and 24 degreesC for CMC/MPPO. The ionic conductivities of all samples were about 10(-7)-10(-6) S/cm at room temperature. The sample of CMC/MPPO presented conductivity value similar to HEC/DPPO but does not exhibit film-forming characteristic indicating its u se as solid polymer electrolytes only in the pellet form.