Structure Elucidation of Hydroxypropyl Cellulose Homogenously Prepared from NaOH/Urea Aqueous Solution  

作　　者：HaiSong Qi Tao Song Fachuang Lu 

机构地区：[1]South China University of Technology, School of Light Industry and Engineering, Guangzhou,Guangdong Province, 510640, China [2]Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany

出　　处：《Paper And Biomaterials》2016年第2期1-7,共7页造纸与生物质材料（英文）

摘　　要：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.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 FF-IR, NMR, gas chromatography （GC） , and size exclusion chroma- tography （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 glyeosyl unit was in the following order： 0-6 〉 0-2 〉 0-3. In addition, the results of the study indicated that the tandem reaction during hydroxypropylation could be ignored.

关 键 词：hydroxypropyl cellulose NaOH/urea aqueous solution STRUCTURE homogenous synthesis gas chromatography analysis 

分 类 号：O636.11[理学—高分子化学] O657.71[理学—化学]