Title:
Synthesis and Properties of Amphoteric Superplasticizer
Author(s):
Wenjuan Guo, Na Sun, Tao Yang, Meishan Pei, and Yingfei Wang
Publication:
Materials Journal
Volume:
108
Issue:
6
Appears on pages(s):
614-618
Keywords:
Adsorption; amphoteric; superplasticizer; zeta potential.
DOI:
10.14359/51683464
Date:
11/1/2011
Abstract:
A series of amphoteric polycarboxylic acid-based superplasticizers (APCs) was synthesized with different side chain lengths nEO from seven to 56 and characterized by FTIR spectra. The dispersing effectiveness of the APCs was assessed by the flow of paste. The amount of superplasticizers adsorbed on the cement significantly decreases with increasing side chain length nEO. The properties of an anionic polycarboxylic acid-based superplasticizer (PCE) were also tested to be compared with APCs. The adsorption amount of APCs was larger than that of an anionic polycarboxylic acid-based superplasticizer (PC). Zeta potential measurements using the electroacoustic method indicate that the steric repulsion among the cement particles carrying adsorbed polymer molecules is the main force for dispersion.