Synthesis of di- and tri-cellulose acetate from rice husk cellulose and commercial microcrystalline by copper perchlorate catalyst

Résumé

Abstract This work describes the synthesis of various di- and tri-cellulose acetates from rice husk cellulose (RHC) and commercial microcrystalline cellulose (CMCC) using copper(II) perchlorate hexahydrate (Cu(ClO 4 ) 2 ·6H 2 O) as an effective catalyst at room temperature and 50 °C. This investigation was conducted using different amounts of Cu(ClO 4 ) 2 ·6H 2 O (100, 200, 300 mg) and 2 g of cellulose for various times (0.5–6 h) in the presence of a constant volume of acetic anhydride (15 mL). Multiple reactions have led to the formation of di- and tri-cellulose acetates. CMCC was remarkably converted into cellulose acetate at room temperature and 50 °C, with yields of 98.10% and 96.10%, respectively. The extracted cellulose from rice husk produced di- and tri-cellulose acetate at room temperature and 50 °C, yielding 86.93% and 92.85%, respectively. Critical expected results were obtained in this work: a strong relationship was found between the degree of substitution (DS) and acetyl percentage (AP%) of the products, the catalyst level in the reaction mixture, the presence or absence of temperature, and the reaction time. The DS and AP% were characterized using FTIR, 1 H-NMR, XRD, and the thermal stability was evaluated by TGA and DTA. This work presents a new catalyst that can produce varying degrees of cellulose acetylation by adjusting reaction temperature, catalyst amount, and reaction duration.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Voir l'article sur le site de la revue

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0