24小时热门版块排行榜    

Znn3bq.jpeg
查看: 172  |  回复: 2
当前主题已经存档。

solarcell

银虫 (小有名气)

[交流] Question: Polymer precipitation

I prepared the polymer containing Pt-backbone. Purification needs several times precipitation. I first dissolved it into dichloromethane and then precipited it from methanol. It was good. When I tried to another precipitation, it failed. No precipitation occured. The same conditions have been applied. what could be the reasons? thanks.
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

xiuyuli

银虫 (小有名气)


huyuchem(金币+1):good! thanks!
In my view,there may be some reasons.First,the amount of methanol isn't enough;Second,the concentration of  polymer in dichloromethane solution could be  to low too precipited.
2楼2006-08-15 21:38:48
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

solarcell

银虫 (小有名气)

Both are possible. But I use 1:300 ration of dichloromethane and methanol. And the dichloromenthane solution of the polymer is highly concentrated too.

I can not figure out something else. It may exist decomposition. I will check. Thanks
3楼2006-08-16 02:24:08
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 solarcell 的主题更新
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 求调剂 +9 小聂爱学习 2026-04-16 11/550 2026-04-17 22:34 by chixmc
[考研] 一志愿华中农业071010,320求调剂 +17 困困困困坤坤 2026-04-14 19/950 2026-04-17 20:08 by 关一盏灯cd
[考研] 295分求调剂 +5 ?要上岸? 2026-04-17 5/250 2026-04-17 16:51 by fenglj492
[考研] 一志愿沪9,326求生物学调剂 +11 刘墨墨 2026-04-13 11/550 2026-04-17 15:35 by wanganpin
[考研] 322求调剂 +6 tekuzu 2026-04-17 6/300 2026-04-17 13:48 by Espannnnnol
[考研] 279求调剂 +13 张番茄不炒蛋 2026-04-11 13/650 2026-04-17 10:38 by cuisz
[论文投稿] 有没有接收比较快的sci期刊呀,最好在一个月之内的,研三孩子求毕业 20+4 之护着 2026-04-16 5/250 2026-04-17 10:02 by bobvan
[考研] 300求调剂 +11 橙a777 2026-04-15 11/550 2026-04-16 22:43 by cfdbai
[考研] 22专硕求调剂 +10 haoyun上岸 2026-04-11 12/600 2026-04-16 22:21 by 猪会飞
[考研] 307中医考研调剂 +6 于以采蘩 2026-04-14 6/300 2026-04-16 16:20 by qingfeng258
[考研] 26药学专硕105500求调剂 +6 喽哈加油 2026-04-13 7/350 2026-04-16 14:31 by zhouxiaoyu
[考研] 求调剂学校 +14 不会吃肉 2026-04-13 16/800 2026-04-15 21:59 by noqvsozv
[考研] 一志愿A区211,22408 321求调剂 +6 随心所欲☆ 2026-04-15 7/350 2026-04-15 21:45 by lbsjt
[考研] 材料工程281还有调剂机会吗 +43 xaw. 2026-04-11 44/2200 2026-04-15 12:46 by 西北望—风沙
[考研] 调剂 +12 月@163.com 2026-04-11 12/600 2026-04-14 15:37 by zs92450
[教师之家] 转长聘了 +7 简单化xn 2026-04-13 7/350 2026-04-14 14:50 by xindong
[考研] 085408光电信息工程专硕355一志愿长春光机所调剂 +6 王ymaa 2026-04-13 13/650 2026-04-14 11:33 by 王ymaa
[考研] 290求调剂 +18 柯淮然 2026-04-12 20/1000 2026-04-13 12:56 by cyh—315
[考研] +10 李多米lee. 2026-04-12 11/550 2026-04-12 22:58 by yuyin1233
[考研] 331求调剂 +5 王国帅 2026-04-11 5/250 2026-04-11 22:56 by 溪涧流水
信息提示
请填处理意见