Synthesis and properties of comb-like and linear polymers: Effects of dispersant structure on the bubble structure, surface activity, adsorption, and rheological performance

Jianfeng Ma, Yazhuo Shang, Changjun Peng, Honglai Liu, Shuzhen Zheng, Yanwei Wang, Shuai Qi, Qianping Ran

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, four types of comb-like dispersants and one linear dispersant were synthesized to explore the effect of dispersant structure on the bubble structure in water solution and mortar system for the first time. Dispersants were modified with different adsorption groups (i.e., carboxylic acid, phosphate ester, and sulfonic groups). Polymer structures were identified using gel permeation chromatography and infrared spectroscopy. Surface tension test indicated that the comb-like dispersants exhibited lower surface tension than that of the linear dispersants (NSF-2), thereby demonstrating that the polycarboxylate superplasticizer (PCE) solutions possessed high surface activity. The analysis of the foamability and foam stability of the comb-like and linear dispersants were comprehensively investigated at different concentrations. Comb-like dispersants possessed higher foam height and better foamability performance than those of the linear dispersants. The bubbles of the dispersant PCE-3 were smaller in terms of the mean area and possessed higher number of bubbles than those of the other dispersants, which may be essential in reducing the viscosity of the slurry. A similar result was also obtained in the mortar system tested using the AVA instrument for PCE-3 and NSF-2. Adsorption and rheological behavior test indicated that comb-like dispersant PCE-3 is the most effective in reducing the viscosity of the slurry among all the dispersants tested. This result is consistent with that of the foamability experiment.

Original languageEnglish
Pages (from-to)336-344
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume562
DOIs
Publication statusPublished - Feb 5 2019

Keywords

  • Bubble structure
  • Characterization
  • Comb-like and linear dispersants
  • Rheological test
  • Surface activity

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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