Mild synthesis of benzylated bamboo in LiCl/DMSO solution |
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| Authors: | Ming-Fei Li Shao-Ni Sun Feng Xu Run-Cang Sun |
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| Affiliation: | 1. Institute of Biomass Chemistry and Technology, Beijing Forestry University, 100083 Beijing, China;2. Institute of Biomass Chemistry and Technology, Beijing Forestry University, 100083 Beijing, China
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 510640 Guangzhou, China |
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| Abstract: | Benzylated bamboo was mildly synthesized in nonaqueous medium without mercerization pretreatment. The ball-milled bamboo was firstly preswelled in lithium chloride/dimethyl sulfoxide (LiCl/DMSO) solution and then reacted with benzyl chloride in the presence of solid NaOH with varying molar ratios of benzyl chloride to OH groups of bamboo (1–4), reaction times (1–8 h), and temperatures (60–90°C). Benzylated bamboo products with yields from 51.1 to 106.9% and with degrees of substitution DS, apparent value evaluated by Fourier transform infrared (FTIR) spectra] between 0.2 and 1.2 were synthesized. FTIR and 13C cross polarization/magic angle spinning nuclear magnetic resonance (CP/MAS NMR) spectroscopy confirmed the incorporation of benzyl groups into bamboo; SEM observations of the highly benzylated bamboo showed porous surface with small irregular slices ascribed to the disruption of intermolecular and intramolecular hydrogen bonds between cellulose. Because of the degradation of amorphous components, the crystallinity decreased negligibly after modification and the thermal stability increased slightly but was lower than that of cellulose. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
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| Keywords: | benzylation Fourier transform infrared lithium chloride/dimethyl sulfoxide nuclear magnetic resonance thermal properties |
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