KONG Xingjie, JIA Cai, LI Kunlan, et al. Synthesis study on hydroxypropyl cellulose in ionic liquids[J]. CIESC Journal, 2013, (S1): 73-79.DOI: 10.3969/j.issn.0438-1157.2013.z1.011.
the ionic liquid N-ethyl-N-ethyl-imidazole diethyl phosphate was used as the main solvent to fully dissolve microcrystalline cellulose (MCC) to achieve hydroxypropylization of MCC. Both MCC and the etherifying agent could be homogeneously disolved in the ionic liquid
and hydroxypropyl cellulose(HPC) was prepared through the alkali treatment
etherification and acidification steps to afford the products of different substitution degree. By adjusting the alkalization temperature
molar ratio of reagents
etherification reaction time and the types of acidifiers
the investigation on the yield and the molar substitution degree of HPC was carried out. The structure of products were characterized by 1H NMR