CELL 41 |
| The synthesis of chloromethylthiirane: 250 ml water, 1.0 mol epichlorohydrin and 2.2 mol thiourea were added into 500ml flask. The solution was stirred at the temperature at 0ºC ~5ºC for 3 h, then rising to room temperature and reacted for 2 h. Remove extra thiourea by washing with water and then transfer it into separating funnel. Collect organic phase and then dried with anhydrous calcium chloride. Chloromethylthiirane was obtained with its diopter of 1.5271 and yield of 66%. The synthesis of polythioether type cotton cellulose: The alkali cellulose was made by immersed 5 g cotton fiber in 10%~20% (w %) sodium hydroxide water solution for 36 hours at room temperature. And then it was reacted with 15g chloromethylthiirane for 20 hours at the temperature between 45 ºC and 48 ºC, then rising the temperature to 60 ºC and reacted for 4-5 hours. The mixture was stirred half an hour after adding 40 ml 95% ethanol, washed with water first and then with acetone. Finally 11.7g light yellow product with 21.3% sulfur containing was obtained after it was dried at the temperature of 60 ºC. The results show that the concentration of sodium hydroxide and the reactant ratio between cotton fiber and chloromethylthiirane will affect the yield and sulfur containing of the product. The better polythioether type cotton cellulose will be made when the concentration of alkali is 20% and the molar ratio between the glucose unit of cellulose and chloromethylthiirane is between 1:4 and 1:5. The preparation process is simple here and this new kind of material can be used to adsorb mercury, silver, cationic dries and cationic surfactants. This project was supported by SMEC (05EZ05). |
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Poster Session
4:00 PM-6:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Division of Cellulose & Renewable Materials |