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1575592654铁虫 (小有名气)
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[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
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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 |
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celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
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5楼2023-10-24 10:08:47
celan
专家顾问 (知名作家)
从事NMR和有机化合物结构鉴定
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【答案】应助回帖
感谢参与，应助指数 +1
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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
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【答案】应助回帖
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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
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4楼2023-10-24 10:07:25