| 查看: 1709 | 回复: 9 | ||||
[求助]
天然纤维素的详细溶解步骤 已有1人参与
|
|
越详细越好,谢谢! 发自小木虫IOS客户端 |
» 猜你喜欢
基金申报
已经有5人回复
基金委咋了?2026年的指南还没有出来?
已经有7人回复
国自然申请面上模板最新2026版出了吗?
已经有17人回复
纳米粒子粒径的测量
已经有8人回复
疑惑?
已经有5人回复
计算机、0854电子信息(085401-058412)调剂
已经有5人回复
Materials Today Chemistry审稿周期
已经有5人回复
溴的反应液脱色
已经有7人回复
推荐一本书
已经有12人回复
常年博士招收(双一流,工科)
已经有4人回复

2楼2017-08-22 22:48:18
| 7%NaOH/12%尿素水溶液预冷至-10 oC后,将50g纤维素(粘均分子量Mη为11.4×104)分散于1000g该溶剂中,室温下剧烈搅拌5分钟即获得透明的纤维素溶液。 |
» 本帖已获得的红花(最新10朵)
3楼2017-08-23 14:11:25
celan
专家顾问 (知名作家)
从事NMR和有机结构鉴定40余年
-

专家经验: +1116 - PEPI: 1
- 应助: 1068 (博后)
- 贵宾: 0.6
- 金币: 32845.3
- 散金: 1085
- 红花: 222
- 帖子: 5153
- 在线: 934.6小时
- 虫号: 174901
- 注册: 2006-01-23
- 性别: GG
- 专业: 有机分析
- 管辖: 有机交流
【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
xiaoLifeiD: 金币+50, ★★★很有帮助 2017-09-09 16:05:27
感谢参与,应助指数 +1
xiaoLifeiD: 金币+50, ★★★很有帮助 2017-09-09 16:05:27
|
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 按这个地址自己可以下载全文 |
4楼2017-08-25 09:34:04

5楼2017-09-09 16:06:22
6楼2017-09-09 22:14:00

7楼2017-11-04 12:56:33
8楼2018-01-15 20:00:07
9楼2018-08-23 22:51:17
柳梦梅
木虫 (知名作家)
- 应助: 0 (幼儿园)
- 金币: 10229.1
- 散金: 151
- 红花: 5
- 沙发: 8
- 帖子: 6928
- 在线: 276.3小时
- 虫号: 15014326
- 注册: 2019-05-04
- 性别: GG
- 专业: 有机合成
10楼2020-05-01 11:59:59











回复此楼
xiaoLifeiD