文献类型：期刊文献

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

作者：Ma, Jianfeng[1,3];Shang, Yazhuo[1];Peng, Changjun[1];Liu, Honglai[1];Zheng, Shuzhen[2];Wang, Yanwei[3];Qi, Shuai[3];Ran, Qianping[3]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Linyi Univ, Sch Chem & Chem Engn, Linyi 276000, Peoples R China;[3]Jiangsu Sobute New Mat Co Ltd, State Key Lab High Performance Civil Engn Mat, Nanjing 210008, Jiangsu, Peoples R China

年份：2019

卷号：562

起止页码：336

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20184806160585);WOS:【SCI-EXPANDED(收录号:WOS:000454428500041)】；

基金：The authors gratefully acknowledge the National Key Research and Development Program of China (2017YFB0310100), the National Natural Science Foundation of China (Project Nos. 21476072, 21705067) and the Fundamental Research Funds for the Central Universities, the National Science Fund for Distinguished Young Scholars (51825203). The Natural Science Foundation of Shandong Province of China (ZR2017PB013), and the Natural Science Foundation of Jiangsu Province of China (BK20160105) for financial support.

语种：英文

外文关键词：Comb-like and linear dispersants; Characterization; Bubble structure; Surface activity; Rheological test

摘要：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.