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Analysis of Chain Branch of Polyolefins by a New Proton NMR Approach

Authors
Jung, MinhwanLee, YuraKwak, SooyoungPark, HeeyongKim, ByoungsooKim, SulheeLee, Kwang HwanCho, Hye SungHwang, Kwang Yeon
Issue Date
2-Feb-2016
Publisher
AMER CHEMICAL SOC
Citation
ANALYTICAL CHEMISTRY, v.88, no.3, pp.1516 - 1520
Indexed
SCIE
SCOPUS
Journal Title
ANALYTICAL CHEMISTRY
Volume
88
Number
3
Start Page
1516
End Page
1520
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/89554
DOI
10.1021/acs.analchem.5b04357
ISSN
0003-2700
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, C-13 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 C-13-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 high field H-1 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 similar to 30 min; furthermore, sample preparation was relatively simple because the method did not require high-concentration samples.
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