 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 5 | 1/1 | 返回列表 |
| 查看: 583 | 回復(fù): 4 | ||||
| 【懸賞金幣】回答本帖問題，作者1575592654將贈(zèng)送您 44 個(gè)金幣 | ||||
| 當(dāng)前只顯示滿足指定條件的回帖，點(diǎn)擊這里查看本話題的所有回帖 | ||||
1575592654鐵蟲 (小有名氣)
|
[求助]
如何根據(jù)聚乙烯核磁氫譜計(jì)算其支化度 已有1人參與
|
|||
|
根據(jù)得到的氫譜結(jié)果，在0.51，0.91以及1.33處有明顯的峰，所用試劑為氘代四氯乙烷，所以怎么根據(jù)這三個(gè)峰計(jì)算其支化度。 發(fā)自小木蟲Android客戶端 |
回復(fù)此樓» 猜你喜歡
0703化學(xué)一志愿211 總分320求調(diào)劑
已經(jīng)有3人回復(fù)
-
0703求調(diào)劑
已經(jīng)有6人回復(fù)
-
（081700）化學(xué)工程與技術(shù)-298分求調(diào)劑
已經(jīng)有6人回復(fù)
-
一志愿天津大學(xué)材料與化工275求調(diào)劑
已經(jīng)有22人回復(fù)
-
0857 資源與環(huán)境 285分
已經(jīng)有6人回復(fù)
-
材料工程,326分，求調(diào)劑
已經(jīng)有5人回復(fù)
-
301求調(diào)劑
已經(jīng)有5人回復(fù)
-
334求調(diào)劑
已經(jīng)有3人回復(fù)
-
材料與化工085600調(diào)劑求老師收留
已經(jīng)有5人回復(fù)
-
一志愿華科071000生物學(xué) 338求調(diào)劑
已經(jīng)有4人回復(fù)
» 本主題相關(guān)商家推薦: (我也要在這里推廣)
celan
專家顧問 (知名作家)
從事NMR和有機(jī)化合物結(jié)構(gòu)鑒定
-
專家經(jīng)驗(yàn): +1121 - PEPI: 1
- 應(yīng)助: 1068 (博后)
- 貴賓: 0.6
- 金幣: 32830.1
- 散金: 1085
- 紅花: 223
- 帖子: 5188
- 在線: 942.3小時(shí)
- 蟲號(hào): 174901
- 注冊(cè): 2006-01-23
- 性別: GG
- 專業(yè): 有機(jī)分析
- 管轄: 有機(jī)交流
5樓2023-10-24 10:08:47
celan
專家顧問 (知名作家)
從事NMR和有機(jī)化合物結(jié)構(gòu)鑒定
-
專家經(jīng)驗(yàn): +1121 - PEPI: 1
- 應(yīng)助: 1068 (博后)
- 貴賓: 0.6
- 金幣: 32830.1
- 散金: 1085
- 紅花: 223
- 帖子: 5188
- 在線: 942.3小時(shí)
- 蟲號(hào): 174901
- 注冊(cè): 2006-01-23
- 性別: GG
- 專業(yè): 有機(jī)分析
- 管轄: 有機(jī)交流
【答案】應(yīng)助回帖
感謝參與，應(yīng)助指數(shù) +1
|
Analysis of Chain Branch of Polyolefins by a New Proton NMR Approach 原文直接下載地址： https://pubs.acs.org/doi/pdf/10.1021/acs.analchem.5b04357 |
2樓2023-10-24 10:01:39
celan
專家顧問 (知名作家)
從事NMR和有機(jī)化合物結(jié)構(gòu)鑒定
-
專家經(jīng)驗(yàn): +1121 - PEPI: 1
- 應(yīng)助: 1068 (博后)
- 貴賓: 0.6
- 金幣: 32830.1
- 散金: 1085
- 紅花: 223
- 帖子: 5188
- 在線: 942.3小時(shí)
- 蟲號(hào): 174901
- 注冊(cè): 2006-01-23
- 性別: GG
- 專業(yè): 有機(jī)分析
- 管轄: 有機(jī)交流
【答案】應(yīng)助回帖
|
上面文章的摘要： ABSTRACT: The crystallinity of polyethylene, which significantly affects the properties of the polymer, is quite sensitive to the concentration of its branches. Thus, it is necessary to estimate branch concentration with reasonable accuracy. Currently, 13C NMR and gel permeation chromatography−Fourier transform infrared spectroscopy are widely-used analysis methods for the analysis of branch concentration. Despite several advantages, these methods sometimes have limitations. For instance, the preparation of samples for 13C- NMR is tedious because high-concentration samples are required and the time for analysis is greater than 12 h. To more efficiently estimate the branch concentration of polyethylene, we developed a new highfield 1 H NMR method with an improved peak resolution by employing (1) homonuclear decoupling and (2) 2D heteronuclear correlation. The new method was observed to significantly reduce the experimental time to ∼30 min; furthermore, sample preparation was relatively simple because the method did not require high-concentration samples. |
3樓2023-10-24 10:02:43
celan
專家顧問 (知名作家)
從事NMR和有機(jī)化合物結(jié)構(gòu)鑒定
-
專家經(jīng)驗(yàn): +1121 - PEPI: 1
- 應(yīng)助: 1068 (博后)
- 貴賓: 0.6
- 金幣: 32830.1
- 散金: 1085
- 紅花: 223
- 帖子: 5188
- 在線: 942.3小時(shí)
- 蟲號(hào): 174901
- 注冊(cè): 2006-01-23
- 性別: GG
- 專業(yè): 有機(jī)分析
- 管轄: 有機(jī)交流
4樓2023-10-24 10:07:25
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 0703求調(diào)劑 +6 | jtyq001 2026-03-10 | 6/300 |
|
|---|---|---|---|---|
|
[考研] 301求調(diào)劑 +5 | Liyouyumairs 2026-03-11 | 5/250 |
|
|
|
[考研] 材料與化工085600調(diào)劑求老師收留 +5 | jiaanl 2026-03-11 | 5/250 |
|
|
|
[考研] 0856化工原理 +5 | z2839474511 2026-03-10 | 5/250 |
|
|
|
[考研] 材料工程330分求調(diào)劑，一志愿985 +5 | 小材化本科 2026-03-07 | 5/250 |
|
|
|
[考研] 接受26屆調(diào)劑生 +22 | 豬豬豬毛 2026-03-06 | 23/1150 |
|
|
|
[考研] 材料工程085601調(diào)劑求老師收留 +8 | 強(qiáng)木木木 2026-03-07 | 10/500 |
|
|
|
[考研] 一志愿北京化工大學(xué)材料與化工296分求調(diào)劑 +14 | 稻妻小編 2026-03-09 | 16/800 |
|
|
|
[考研] 調(diào)劑 +5 | 調(diào)劑的考研學(xué)生 2026-03-09 | 5/250 |
|
|
|
[考研] 材料與化工求調(diào)劑 +11 | 與冬清寧 2026-03-07 | 14/700 |
|
|
|
[考研] 320求調(diào)劑 +4 | 魏zy 2026-03-08 | 4/200 |
|
|
|
[考研] 070300化學(xué)求調(diào)劑 +5 | 撲風(fēng)鈴的貓 2026-03-08 | 10/500 |
|
|
|
[考研] 297求調(diào)劑 +3 | 胡達(dá)靈 2026-03-05 | 5/250 |
|
|
|
[考研] 一志愿211 化學(xué)305分求調(diào)劑 +3 | 0703楊悅305分 2026-03-05 | 3/150 |
|
|
|
[考研] 070300化學(xué)求調(diào)劑292分 +3 | 打烊eee 2026-03-07 | 3/150 |
|
|
|
[考研] 一志愿211 085600 280數(shù)二英二求調(diào)劑 +3 | 月山斜 2026-03-06 | 3/150 |
|
|
|
[考研] 材料專碩323求調(diào)劑 +5 | 李白26 2026-03-07 | 5/250 |
|
|
|
[考研] 求調(diào)劑 +4 | 呼呼？~+123456 2026-03-06 | 4/200 |
|
|
|
[考研] 308求調(diào)劑 +7 | 倘若起風(fēng)了呢 2026-03-05 | 9/450 |
|
|
|
[考研] 08工科求調(diào)劑 +3 | 隆LLL 2026-03-06 | 4/200 |
|