Study of different types polycarboxylate superplasticizer by 1H NMR
LIN Qian
FANG Yunhui
LI Geli
Abstract：By conducting nuclear magnetic resonance (1H NMR) spectroscopy analysis on the four kinds of common poly-oxyethylene ether maromonomers,1H NMR spectrometric technique was developed to determine the type of polycarboxylate super-plasticizers(PC) rapidly and accurately. The ultrafiltration of polycarboxylate samples was carried out by ultrafiltration membrane with different molecular weight cutoffs. The collected polycarboxylate superplasticizer with different molecular weight was researched by 1H NMR spectroscopy. The results show that the molecular structure information of the PC-polyester was directly obtained by the analysis of the original 1H NMR without further ultrafiltration dialysis. However,that of the macromonomer of PC-polyether can only be accurately obtained by getting pure macromonomer after the pretreatment by 30 kD,10 kD and 3 kD ultrafiltration mem-brane. The method provides an important basis for resolving the molecular structure and molecular mass of different types of poly-carboxylate superplasticizers.
Keywords：1H NMRpolycarboxylate superplasticizerspolyesterpolyetherqualitative analysismolecular weight
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 41-45 )