应《网络安全法》要求，自2017年10月1日起，未进行实名认证将不得使用互联网跟帖服务。为保障您的帐号能够正常使用，请尽快对帐号进行手机号验证，感谢您的理解与支持！

24小时热门版块排行榜    

小木虫论坛-学术科研互动平台 » 化学化工区 » 高分子 » 合成制备 » PEO基固态电解质高温电池想法
323/4返回列表上一页1234下一页
查看: 2872  |  回复: 31
只看楼主 @他人 存档 新回复提醒 (忽略) 收藏    在APP中查看
【有奖交流】积极回复本帖子，参与交流，就有机会分得作者 qiuqiu3 的 37 个金币

XG-WUST
up

发自小木虫IOS客户端
21楼2025-06-25 22:08:13
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
引用回帖:
20楼: Originally posted by qiuqiu3 at 2025-06-25 16:41:35
谢谢老师回复，您是专业的！
PMDA指的就是均苯四甲酸二酐，用PMDA是因为热稳定性好，就想着能不能把它和peo进行交联形成化学键提高固态电解质机械强度和热稳定性
老师如果理论上可以交联的话，那么需要加交联剂吗 ...

https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf

Determining Number of Moles To determine the number of moles of polymer the analysis method
must respond equally to each molecule without regard to its chain length. As the structures given
above show, the monomer molecules on the ends of the chain must in some way be different from
the chain itself. For a linear polymer (i.e., one in which there are no bonds, called crosslinks, between
the chains) every molecule has two end groups, which may be identical, as in PEG, or different, as in
Dacron. (For polymers such as PVC and polystyrene the identities of R and R’ depend on the choice
of reagent used to initiate the polymerization reaction.) Thus, if the end groups can be analyzed, the
number of polymer molecules may be calculated using simple stoichiometric relationships. This
method for determining Mn is called end group analysis.
Figure 2. Reaction of PMDA with PEG to produce ester
Some Specifics The ends
of PEG are alcohol groups,
which may be analyzed by a
reaction known
as
esterification. In an
esterification the -OH reacts
with an organic acid, or, more
commonly, with a more
reactive derivative of the acid.
In this experiment the
anhydride of 1,2,4,5
benzenetetracarboxylic acid,
known commonly as
pyromellitic dianhydride, or PMDA for short, will be used. The reaction with PEG is shown in Fig. 2.
The reaction must be conducted in a nonaqueous solvent, and, because of its low volatility and
desirable solvating properties, N,N-dimethyl formamide, DMF, is a good
choice. A catalyst is also required, and in many esterification procedures
pyridine, a rather foul-smelling organic base, is used. However, for the
reaction of alcohols with PMDA it has been found that imidazole, IMDA, a
very soluble solid with no odor, has at least equal catalyzing power. The
formulas of DMF and IMDA are shown below.
The analysis involves an indirect titration procedure. An excess of PMDA is
mixed with the weighed PEG sample, and the catalyst is added. After the
reaction is complete (at least one-half hour reaction time), water is added to
convert the unreacted anhydride groups to the acid form, and the acid is titrated with standard NaOH.
The equations in Fig. 3 show that each ester linkage to a PEG end group replaces one of the four
赞一下 回复此楼
22楼2025-06-26 10:02:37
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
引用回帖:
20楼: Originally posted by qiuqiu3 at 2025-06-25 16:41:35
谢谢老师回复，您是专业的！
PMDA指的就是均苯四甲酸二酐，用PMDA是因为热稳定性好，就想着能不能把它和peo进行交联形成化学键提高固态电解质机械强度和热稳定性
老师如果理论上可以交联的话，那么需要加交联剂吗 ...

https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf
赞一下 回复此楼
23楼2025-06-26 10:04:11
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
引用回帖:
20楼: Originally posted by qiuqiu3 at 2025-06-25 16:41:35
谢谢老师回复，您是专业的！
PMDA指的就是均苯四甲酸二酐，用PMDA是因为热稳定性好，就想着能不能把它和peo进行交联形成化学键提高固态电解质机械强度和热稳定性
老师如果理论上可以交联的话，那么需要加交联剂吗 ...

https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf
赞一下 回复此楼
24楼2025-06-26 10:05:27
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
引用回帖:
20楼: Originally posted by qiuqiu3 at 2025-06-25 16:41:35
谢谢老师回复，您是专业的！
PMDA指的就是均苯四甲酸二酐，用PMDA是因为热稳定性好，就想着能不能把它和peo进行交联形成化学键提高固态电解质机械强度和热稳定性
老师如果理论上可以交联的话，那么需要加交联剂吗 ...

POLYMER END-GROUP ANALYSIS: THE DETERMINATION OF AVERAGE
MOLECULAR WEIGHT

https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf

您看看这两篇，与您的反应相似
赞一下 回复此楼
25楼2025-06-26 10:10:23
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
引用回帖:
20楼: Originally posted by qiuqiu3 at 2025-06-25 16:41:35
谢谢老师回复，您是专业的！
PMDA指的就是均苯四甲酸二酐，用PMDA是因为热稳定性好，就想着能不能把它和peo进行交联形成化学键提高固态电解质机械强度和热稳定性
老师如果理论上可以交联的话，那么需要加交联剂吗 ...

POLYMER END-GROUP ANALYSIS: THE DETERMINATION OF AVERAGE
MOLECULAR WEIGHT

Reaction of PMDA with PEG to produce ester
https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf
赞一下 回复此楼
26楼2025-06-26 10:22:33
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
https://www.chem.fsu.edu/chemlab ... _end_group_anal.pdf
赞一下 回复此楼
27楼2025-06-26 10:23:59
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
Reaction of PMDA with PEG to produce ester

我从事NMR和有机化合物结构分析。
赞一下 回复此楼
28楼2025-06-26 10:26:19
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

qiuqiu3

铁虫 (初入文坛)
引用回帖:
28楼: Originally posted by celan at 2025-06-26 10:26:19
Reaction of PMDA with PEG to produce ester

我从事NMR和有机化合物结构分析。

谢谢老师，您发的五个链接都是同一篇文章
赞一下 回复此楼
29楼2025-06-26 13:22:24
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

celan

专家顾问 (知名作家)

从事NMR和有机化合物结构鉴定
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
引用回帖:
29楼: Originally posted by qiuqiu3 at 2025-06-26 13:22:24
谢谢老师，您发的五个链接都是同一篇文章...

当时小木虫发帖不顺利，走不动，我想尽快把帖子给你回了 ，就多点击几次。
赞一下 回复此楼
30楼2025-06-26 15:22:31
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 qiuqiu3 的主题更新
323/4返回列表上一页1234下一页
普通表情 龙 兔 虎 猫 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] 售SCI一区文章，我:8.O.551.O.5.4,科目全,可伽急 +4 ZYXdhzDAy9ZX 2026-09-28 4/200 2026-10-03 09:46 by Equinoxhua
[找工作] 售SCI一区文章，我:8.O.551.O.5.4,科目全,可伽急 +4 ZYXdhzDAy9ZX 2026-09-28 4/200 2026-10-03 08:49 by Equinoxhua
[公派出国] 售一区SCI文章T0P，我:8O.551.O54,科目全,可十急 +5 IDs3scOF0tjC 2026-09-28 6/300 2026-10-03 08:47 by Equinoxhua
[硕博家园] 售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急 +4 tqUTOxClQUMF 2026-09-28 4/200 2026-10-02 23:12 by Equinoxhua
[考研] 售一区SCI文章T0P，我:8O.551.O54,科目全,可十急 +4 tqUTOxClQUMF 2026-09-28 4/200 2026-10-01 21:07 by Equinoxhua
[考博] 售SCI文章，我:8O.5.5.1O.54,科目全,可十急 (EPI+-1)(金币-50) +3 cqwQDCxMcL3I 2026-09-29 4/200 2026-09-30 16:52 by Z9YWQ5EAO3qp
[找工作] 售SCI一区T0P文章，我:8.O.55.1.O54,科目全,可伽急 +3 cqwQDCxMcL3I 2026-09-29 4/200 2026-09-30 16:33 by Z9YWQ5EAO3qp
[考研] 售SCI一区文章，我:8O5.5.1.O5.4,科目全,可伽急 +3 cqwQDCxMcL3I 2026-09-29 6/300 2026-09-30 16:14 by Z9YWQ5EAO3qp
[教师之家] 某top大学教授说“能够在市场中兑现的能力才是真能力”无比同意！ +10 zju2000 2026-09-26 13/650 2026-09-30 10:26 by yexuqing
[博后之家] 售SCI文章，我:8O.5.5.1O.54,科目全,可十急 +4 IDs3scOF0tjC 2026-09-28 4/200 2026-09-29 19:27 by cqwQDCxMcL3I
[找工作] 售SCI一区T0P文章，我:8.O.55.1.O54,科目全,可伽急 +4 ZYXdhzDAy9ZX 2026-09-28 4/200 2026-09-29 16:54 by yCO1Ll7aHtsw
[考博] 售SCI一区文章，我:8.O.55.1.O.54,科目齐全,可伽急 +4 ZYXdhzDAy9ZX 2026-09-28 4/200 2026-09-29 16:47 by yCO1Ll7aHtsw
[考研] 售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急 +3 ZYXdhzDAy9ZX 2026-09-28 4/200 2026-09-29 16:37 by etmYJ6d2rquH
[博后之家] 售SCI-T0P文章，我:8O.5.5.1.O.54,科目齐全,可+急 +3 ZYXdhzDAy9ZX 2026-09-28 3/150 2026-09-29 16:30 by etmYJ6d2rquH
[博后之家] 售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急 +3 tqUTOxClQUMF 2026-09-28 3/150 2026-09-29 15:04 by etmYJ6d2rquH
[考博] 售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急 +6 GDBe8tDZqE8z 2026-09-28 6/300 2026-09-29 14:41 by etmYJ6d2rquH
[教师之家] 售一区SCI文章T0P，我:8O.551.O54,科目全,可十急 +4 GDBe8tDZqE8z 2026-09-28 4/200 2026-09-29 09:49 by JzYBbHIXWSrW
[考研] 售SCI一区文章，我:8.O.55.1.O.54,科目齐全,可伽急 +3 GDBe8tDZqE8z 2026-09-28 3/150 2026-09-28 23:12 by b8fCuTHqckEt
[硕博家园] 售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急 +3 CfXuS1rDhLYN 2026-09-28 4/200 2026-09-28 22:55 by ez6fGg9abYaj
[论文投稿] 售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急 +3 CfXuS1rDhLYN 2026-09-28 3/150 2026-09-28 19:08 by 9lS3ad5oOymn
信息提示
关闭
请填处理意见
关闭