Application of 1H Low-Field NMR Spectroscopy for the Determination of the Concentration and Molecule Weight of Polycarboxylate Superplasticizers

被引：0
|
作者：
Y. Ji
Zh. Sun
M. Pang
J. Yang
机构：
[1] Key Laboratory of Advanced Civil Engineering Materials,
[2] Ministry of Education,undefined
[3] School of Materials Science and Engineering at Tongji University,undefined
来源：
Journal of Applied Spectroscopy | 2021年 / 88卷
关键词：
polycarboxylate superplasticizers; concentration; molecule weight; H low-field Carr-Purcell-Meiboom-Gill spectroscopy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
As a type of water reducer, polycarboxylate superplasticizers (PCEs) has been widely used in the concrete industry. The concentration and molecule weight of PCEs have a profound impact on the performance of fresh concrete. Based on 1H low-field nuclear magnetic resonance (NMR) spectroscopy, this paper developed a novel method for the determination of the concentration and characterization of the molecule weight of PCEs. Five types of PCEs with various ether to acid ratios (3:1 to 5:1) and functional groups were synthetized in laboratory conditions, and their molecular structures were characterized by size exclusion chromatography. PCE solutions with concentrations from 0 to 40% were measured using the Carr–Purcell–Meiboom–Gill sequence by 1H low-field NMR. The results showed that the T2 value of the main peak has a linear relation with the PCE concentration. The signal intensity of peaks whose T2 values are smaller than 10 ms of the PCE solutions with a concentration of 20% is linearly correlated to the molecule weight of PCEs.
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页码：317 / 322
页数：5
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