@article{Qi2016, 
author = {HaiSong Qi and Tao Song and Fachuang Lu},
title = {Structure Elucidation of Hydroxypropyl Cellulose Homogenously Prepared from NaOH/Urea Aqueous Solution},
year = {2016},
journal = {Paper and Biomaterials},
volume = {1},
number = {2},
pages = {1-7},
keywords = {hydroxypropyl cellulose, NaOH/urea aqueous solution, structure, homogenous synthesis, gas chromatography analysis},
url = {https://www.sciopen.com/article/10.26599/PBM.2016.9260009},
doi = {10.26599/PBM.2016.9260009},
abstract = {Hydroxypropyl celluloses (HPC) were homogenously synthesized by the reaction of cellulose with propylene oxide in NaOH/urea aqueous solution. Water-soluble HPC with molar degree of substitution (MSNMR) in the range of 0.52~0.78 was prepared from microcrystalline cellulose, cotton linters, and spruce sulfite pulp. The structure of the HPC samples was characterized by means of FT-IR, NMR, gas chromatography (GC), and size exclusion chromatography (SEC) analyses. Three types of cellulose samples with different molecular weights were found to dissolve well in the NaOH/urea solvent with no obvious differences in reactivity and regioselectivity. The relative reactivity of hydroxyl groups in the glycosyl unit was in the following order: O-6 > O-2 > O-3. In addition, the results of the study indicated that the tandem reaction during hydroxypropylation could be ignored.}
}