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[求助]
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求調(diào)劑，一志愿 南京航空航天大學(xué) ，080500材料科學(xué)與工程學(xué)碩，總分289分
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Ronde
金蟲(chóng) (初入文壇)
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9樓2018-08-23 22:51:17
2樓2017-08-22 22:48:18
| 7%NaOH/12%尿素水溶液預(yù)冷至-10 oC后，將50g纖維素(粘均分子量Mη為11.4×104)分散于1000g該溶劑中，室溫下劇烈攪拌5分鐘即獲得透明的纖維素溶液。 |
» 本帖已獲得的紅花（最新10朵）
xiaoLifeiD3樓2017-08-23 14:11:25
celan
專家顧問(wèn) (知名作家)
從事NMR和有機(jī)化合物結(jié)構(gòu)鑒定
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【答案】應(yīng)助回帖
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感謝參與，應(yīng)助指數(shù) +1
xiaoLifeiD: 金幣+50, ★★★很有幫助 2017-09-09 16:05:27
感謝參與，應(yīng)助指數(shù) +1
xiaoLifeiD: 金幣+50, ★★★很有幫助 2017-09-09 16:05:27
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Macromol Biosci. 2005 Jun 24;5(6):539-48. Rapid dissolution of cellulose in LiOH/urea and NaOH/urea aqueous solutions. Cai J1, Zhang L. Author information Abstract Rapid dissolution of cellulose in LiOH/urea and NaOH/urea aqueous solutions was studied systematically. The dissolution behavior and solubility of cellulose were evaluated by using (13)C NMR, optical microscopy, wide-angle X-ray diffraction (WAXD), FT-IR spectroscopy, DSC, and viscometry. The experiment results revealed that cellulose having viscosity-average molecular weight ((overline) M eta) of 11.4 x 104 and 37.2 x 104 could be dissolved, respectively, in 7% NaOH/12% urea and 4.2% LiOH/12% urea aqueous solutions pre-cooled to -10 degrees C within 2 min, whereas all of them could not be dissolved in KOH/urea aqueous solution. The dissolution power of the solvent systems was in the order of LiOH/urea > NaOH/urea >> KOH/urea aqueous solution. The results from DSC and (13)C NMR indicated that LiOH/urea and NaOH/urea aqueous solutions as non-derivatizing solvents broke the intra- and inter-molecular hydrogen bonding of cellulose and prevented the approach toward each other of the cellulose molecules, leading to the good dispersion of cellulose to form an actual solution. PMID: 15954076DOI: 10.1002/mabi.200400222 按這個(gè)地址自己可以下載全文 |
4樓2017-08-25 09:34:04
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