| Structure Elucidation of Hydroxypropyl Cellulose Homogenously Prepared from NaOH/Urea Aqueous Solution |
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| Author Name | Affiliation | | HaiSong Qi1,2 | 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 | | Tao Song1 | 1. South China University of Technology, School of Light Industry and Engineering, Guangzhou,Guangdong Province, 510640, China | | Fachuang Lu1,* | 1. South China University of Technology, School of Light Industry and Engineering, Guangzhou,Guangdong Province, 510640, China |
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| 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 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 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 |
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