Synthesis of star-comb polycarboxylate superplasticizer and its effect on apparent viscosity of cement-based material
LI Shentong
YANG Yong
SHU Xin
LIU Jinzhi
QI Shuai
RAN Qianping
Abstract：A series of star-comb copolymer architecture of polycarboxylate superplasticizers,poly (acrylic acid)-co-poly[isoprenyl oxy poly(ethylene glycol)ether](PAA-co-PIPEG)with different molecular weight,were prepared by free radical polymerization under the adjustment of a star chain transfer agent with multiple sulfhydryl groups. The molecular architecture of the star-comb polycarboxylate was characterized by proton nuclear magnetic resonance and gel permeation chromatography with a triple-detector system. The effects of the star-comb polycarboxylate superplasticizers on cement-based materials were investigated by net fluid,adsorption,rheology and concrete experiments. It was found the star-comb structure weakened the water-reducing ability and adsorption efficiency of polycar-boxylate superplasticizers,but at the same time significantly reduced the apparent viscosity of cement-based materials.
Keywords：polycarboxylate superplasticizerstar-combapparent viscosity
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：6( 1-5,23 )