Structure Elucidation of Hydroxypropyl Cellulose Homogenously Prepared from NaOH/Urea Aqueous Solution |
| |
Authors: | HaiSong Qi Tao Song and Fachuang Lu |
| |
Affiliation: | 1. South China University of Technology, School of Light Industry and Engineering, Guangzhou,Guangdong Province, 510640, China;Leibniz Institute of Polymer Research Dresden, Hohe Str.6, D-01069 Dresden, Germany;2. South China University of Technology, School of Light Industry and Engineering, Guangzhou,Guangdong Province, 510640, China |
| |
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. |
| |
Keywords: | hydroxypropyl cellulose NaOH/urea aqueous solution structure homogenous synthesis gas chromatography analysis |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|