Regeneration of cellulose from selected cellulosic water materials using aqueous based solvent system
Cellulose is one of the most abundant renewable biopolymers that can be used fur material purposes. Technologies have been developed for cellulose dissolution and regeneration for different purposes. However the conventional regeneration methods generate harmful substances and become sources of pol...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Year Project Report |
| Language: | English |
| Published: |
Universiti Malaysia Sarawak (UNIMAS)
2010
|
| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/25553/2/Chong%20Wei%20Lim%20ft.pdf http://ir.unimas.my/id/eprint/25553/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Universiti Malaysia Sarawak |
| Language: | English |
| Summary: | Cellulose is one of the most abundant renewable biopolymers that can be used fur material purposes.
Technologies have been developed for cellulose dissolution and regeneration for different purposes. However the conventional regeneration methods generate harmful substances and become sources of pollution. In this study, aqueous-based solvent system of NaOH! Thiourea! Grea (NTU) was used to dissolve three types of
cellulosic materials efficiently with high yields of regenerated cellulose. Absence of thiourea or urea in the
solvent system gave a lower yield of regenerated cellUlose, indicating that these three worked synergisticaUy in cellulose dissolution. The cellulosic samples underwent mechanical and chemical pretreatments to enhance their dissolution in the solvent system, Optimized composition of NTU solvent system which can dissolve the cellulosic materials entirely was attempted. The dissolution capacity of the NTU solvent system of optimized composltion was further investigated. The cellulose was regenerated with addition of non-solvent, ethanol. Besides, the cellulose was crosslinked with sodium trimetaphosphate (STMP). Thc crosslinking process was carried out under basic condition at 45"C for 2 hours. Different molar ratios ofSTMP 10 cellulose were used, 10 detennine the optimum amount of STMP for corsslinking with cellulose, The morphology, particle size and structure of the regenerated cellulose and regenerated crosslinked cellulose were investigated by scanning electron microscope (SEM) whereas chemical characterization was done by Fourier-Transfonn Infrared
spectrometry(FT -IR). |
|---|