Elaboration of the new cellulose derivative films (HECA) based on "Stipa Tenacissima" cellulose of Eastern Morocco

Hydroxyethyl cellulose Acetate (HECA) was prepared starting from hydroxyethyl cellulose (HEC), acetic anhydride and perchloric acid which was used as catalyst. The synthesized product was characterized by TFIR, 13C NMR and 1H NMR. Substitution degree (DS) of HECA was determined using FTIR spectra taking a classical titration method and 1H NMR spectra as reference. The DS is substantially affected by the temperature, the time of reaction and especially the equivalent number (eq. nb.) of the acetic anhydride added. The thermal analysis study shows some differences in Tg and thermal degradation between HEC and HECA, moreover these thermal temperatures are influenced by DS values.