Studies on the Preparation and Application of Tetramethylsilylcellulose from Rain Tree Sawdust

Abstract:

The upcycling process of agricultural waste for cellulose production has been attempted. In this study, cellulose was extracted from sawdust of the rain tree using 4% (w/v) NaOH solution. 1.5 g of extracted cellulose was soaked in water and N,N-dimethylacetamide (DMA) respectively. The soaked cellulose was dissolved in dimethylacetamide/LiCl and reacted with hexamethyldisilazane (HMDS) yielding tetramethylsilylcellulose (TMSC). The IR spectrum shows the presence of-Si (CH₃)₃ groups: ν_Si-O at 1047 cm^-1, ν_C-Si at 1252, 843 and 750 cm^-1. The ¹H-NMR result confirms the presence of-Si (CH₃)₃ groups at  0 ppm and pyranose ring protons in the range of 2.8-4.5 ppm. SEM image of TMSC shows the fibrous characteristics of cellulose while the EDX shows the presence of Si. The degree of substitution (DS) values calculated from FT-IR and EDX data are 2.33 and 2.08 respectively. 1.0% w/v TMSC solution in THF was prepared. A Small piece (2.0 cm x 4.0 cm) of filter paper was dipped into the TMSC solution for 30 min. The coated paper has an average contact angle of 116o. However the characteristic bands of the TMSC were not observed from FT-IR analysis. While the EDX shows the presence of Si on the paper surface..

• Periodical: Key Engineering Materials (Volume 824)
• Pages: 121-127
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.824.121
• Online since: October 2019
• Authors: Worranun Wongchompoo, Thanatcha Kanthamoon, Radchada Buntem*
• Keywords: Hydrophobic Cellulose, Sawdust, Tetramethylsilylcellulose, Waste Upcycle

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