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【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ zc1384: 金币+15, ★★★很有帮助, 受教了 2012-08-29 09:34:03
你沉淀的时候需要磁子搅拌,这样的话最后样品都会粘在烧杯底部或者壁上,不用液氮。沉淀完后倾倒掉沉淀溶剂,氮吹掉残余溶剂,再加入少量溶剂,溶解后重复沉淀提纯。
不能期望所有的聚合物样品都是白色粉末,要学会操作其他状态的样品。
附上一篇老马12年前做这个聚合物的文章
Macromolecules, 2000, 33 (11), pp 4039–4047
"...was then dissolved in a minimum amount of diethyl ether (150 mL), after which it was precipitated into a 10-fold excess of a 50:50 v:v water:MeOH solution. After decanting off the solvent, the polymer was redissolved in diethyl ether, and the precipitation procedure was repeated two more times. The final polymer was dissolved in diethyl ether and transferred to a tared container, and the solvent was removed under vacuum. " |
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