Synthesis of a small molecular polydentate polymer IHP-MP and its application to cement or graphene oxide dispersion via strong interactions between adsorption groups and interfaces

The presence of a highly alkaline environment or large amounts of Ca 2+ in concrete exerts a great influence on the dispersion of graphene oxide (GO) particles. Therefore, the development of a highly efficient GO dispersant to adapt to complex concrete environments is important. In this work, novel...

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Bibliographic Details
Published in:Journal of materials science 2020-04, Vol.55 (11), p.4701-4716
Main Authors: Ma, Jianfeng, Zhao, Hongxia, Shang, Yazhuo, Peng, Changjun, Liu, Honglai, Zheng, Shuzhen, Wang, Tao, Qi, Shuai, Ran, Qianping
Format: Article
Language:English
Subjects:
Adsorption
Calcium ions
Cement hydration
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry and Materials Science
Classical Mechanics
Composites & Nanocomposites
Crystallography and Scattering Methods
Dispersants
Graphene
Graphite
Infrared spectroscopy
Materials Science
NMR
Nuclear magnetic resonance
Nuclear magnetic resonance spectroscopy
Organic chemistry
Phosphates
Political activity
Political aspects
Polymer industry
Polymer Sciences
Polymers
Solid Mechanics
Strong interactions (field theory)
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Summary:The presence of a highly alkaline environment or large amounts of Ca 2+ in concrete exerts a great influence on the dispersion of graphene oxide (GO) particles. Therefore, the development of a highly efficient GO dispersant to adapt to complex concrete environments is important. In this work, novel phosphate-modified small molecular polydentate polymers were synthesized and used as efficient dispersants for cement and high-concentration GO solutions. The chemical structure of the polymers was confirmed by 1 H NMR and IR spectroscopy, and the effect of adsorption groups on the adsorption ability of polymers was studied by using adsorption experiments and theoretical calculations. Results showed that the dispersant inositol hexaphosphate–methoxy polyether (IHP-MP) features a high adsorption equilibrium constant and strong adsorption ability. IHP-MP exhibited not only good water-reducing and slump-retaining properties but also remarkable cement hydration-retarding effects due to its numerous phosphate groups. IHP-MP could be used as an auxiliary GO dispersant with the comb polymer PCE to effectively reduce the viscosity and improve the stability of GO solutions. SEM, TGA and IR characterization indicated that IHP-MP strongly interacts with the surface groups of GO particles. Graphic Abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-019-04338-2