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Updated: Jul 3, 2026

Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
Published on: August 28, 2014
Adsorption Behavior and Molecular Interaction Mechanism of AMPS-Copolymer/HEDP Complex Retarder on Hydration of
Sheng Huang1,2, De Sun1,2, Zaoyuan Li1,2
1National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
Abstract:
Hydroxyethylidene diphosphonic acid (HEDP) is used as an auxiliary material for AMPS (2-acrylamido-2-methylpropanesulfonic acid) copolymer retarders because of its good water solubility and high temperature resistance. This paper investigates how the presence of HEDP significantly enhances the inhibitory effect of AMPS copolymers (PAIND) on cement hydration, focusing on adsorption behavior and interfacial interactions. The adsorption capacity, adsorption thickness and interface interaction were characterized by total organic carbon, ζ-potential, X-ray photoelectron spectroscopy (XPS) and molecular dynamics simulation. Adsorption behavior experiments revealed that the PAIND/HEDP complex retarder exhibited higher adsorption capacity and a thicker adsorption layer on C3S surfaces compared to individual PAIND or HEDP. HEDP may enhance the overall adsorption capacity of the system and increase the thickness of the adsorption layer by filling the vacant adsorption sites at the PAIND-C3S interface. Interfacial interaction analysis reveals that in PAIND, increasing HEDP content enhances the adsorption of the PAIND/HEDP complex retarder onto C3S, resulting in reduced conformational changes and a more stable adsorption layer. This is primarily attributed to a robust network structure formed via multiple chemical interactions─including hydrogen and ionic bonds─between the retarder and C3S, which strengthens inhibition of C3S hydration under extreme high-temperature conditions.
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