The results showed that the substitution degree (DS) increased but the yield decreased with increasing the reaction temperature and time, the acetic anhydride-cellulose wt ratio and catalyst concn.

• 结果表明：随着反应时间、反应温度、醋酸酯与纤维素质量比和催化剂用量的提高，其取代度DS增大，但产率降低。