CONCRETE

UDC 691.322; 542.9

Lei Lie PhD, Chair for Construction Chemicals, Technical University of Munich, Munich, Germany

Dongjie Yin College of Materials Science and Engineering, Beijing University of Technology

Jingying Peng College of Materials Science and Engineering, Beijing University of Technology

Ziming Wang College of Materials Science and Engineering, Beijing University of Technology, Beijing, China

Alitinform №2 (59) 2020 г. 38-50 p.

Abstract

In this study, polycarboxylate superplasticizers (PCEs) were synthesized from isoprenyl oxy poly(ethylene glycol) ether (IPEG) and acrylic acid via aqueous free-radical copolymerization. The copolymer composition was calculated based on the residual amounts of IPEG macromonomer and acrylic acid as obtained from size exclusion chromatography (SEC) and high-performance liquid chromatography (HPLC). Subsequently, the relative monomer reactivity ratios r₁ and r₂ were determined by applying three different linearization methods, namely the Kelen–Tüdős, Inverted Kelen–Tüdős and the Yezrielev–Brokhina–Roskin method. The individual values derived from the three methods were quite consistent and found at r₁(IPEG)=0.042 and r₂(AA)=1.61.

Key words:

ПКЭ, IPEG, суперпластификатор, макромономер, сополимеризация, реактивность