| 查看: 577 | 回复: 4 | |||||
| 【悬赏金币】回答本帖问题，作者1575592654将赠送您 44 个金币 | |||||
1575592654铁虫 (小有名气)
|
[求助]
如何根据聚乙烯核磁氢谱计算其支化度 已有1人参与
|
||||
|
根据得到的氢谱结果，在0.51，0.91以及1.33处有明显的峰，所用试剂为氘代四氯乙烷，所以怎么根据这三个峰计算其支化度。 发自小木虫Android客户端 |
回复此楼» 猜你喜欢
（081700）化学工程与技术-298分求调剂
已经有4人回复
-
求调剂
已经有5人回复
-
一志愿中科大材料与化工。353分能调剂到哪？
已经有7人回复
-
337一志愿华南理工0805材料求调剂
已经有5人回复
-
伙伴们，祝我生日快乐吧
已经有4人回复
-
301求调剂
已经有3人回复
-
材料与化工304求B区调剂
已经有4人回复
-
读博申请
已经有7人回复
-
一志愿江南大学085701环境工程专硕总分287求调剂
已经有5人回复
-
材料工程330分求调剂，一志愿985
已经有5人回复
» 本主题相关商家推荐: (我也要在这里推广)
celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
-
专家经验: +1121 - PEPI: 1
- 应助: 1068 (博后)
- 贵宾: 0.6
- 金币: 32830.1
- 散金: 1085
- 红花: 223
- 帖子: 5188
- 在线: 942.3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
|
Analysis of Chain Branch of Polyolefins by a New Proton NMR Approach 原文直接下载地址： https://pubs.acs.org/doi/pdf/10.1021/acs.analchem.5b04357 |
2楼2023-10-24 10:01:39
celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
-
专家经验: +1121 - PEPI: 1
- 应助: 1068 (博后)
- 贵宾: 0.6
- 金币: 32830.1
- 散金: 1085
- 红花: 223
- 帖子: 5188
- 在线: 942.3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
|
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楼2023-10-24 10:02:43
celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
-
专家经验: +1121 - PEPI: 1
- 应助: 1068 (博后)
- 贵宾: 0.6
- 金币: 32830.1
- 散金: 1085
- 红花: 223
- 帖子: 5188
- 在线: 942.3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
4楼2023-10-24 10:07:25
celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
-
专家经验: +1121 - PEPI: 1
- 应助: 1068 (博后)
- 贵宾: 0.6
- 金币: 32830.1
- 散金: 1085
- 红花: 223
- 帖子: 5188
- 在线: 942.3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
5楼2023-10-24 10:08:47
