Determination of molecular weight and distribution of polycarboxylate superplasticizer by triple detection GPC

摘要

The molecular weight and molecular weight distribution (MWD) of polycarboxylate superplasticizer (PCE) was measured by gel permeation chromatograph (GPC) which combined three different detectors, namely refractive index detector (RI), laser light scattering detector (LS) and viscosity detector (VIS). By conducting numerous experiments, what the different peak stand for in the chromatogram was verified and the best sample concentration range in the GPC experiment was also determined. Besides, based on the analysis to the RI chromatogram, the theory on using peak area ratio to denote concentration ratio was put forward. What's more, the calculation of macromonomer reaction ratio using the peak area in the RI chromatogram was introduced.