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• W2762189964 abstract "ABSTRACT Acrylate‐containing polycarboxylate superplasticizers were synthesized by copolymerizing acrylic acid, α‐methallyl‐ω‐methoxy poly(ethylene glycol) ether, and acrylic esters [hydroxyethyl acrylate (HEA) or hydroxypropyl acrylate (HPA)]. Their dispersing effects and fluidity‐retaining capabilities were evaluated by spread tests of cement pastes. The temperature sensitivity of the performance was especially focused upon. It was found by Fourier transform infrared spectroscopy and specific anionic charge density measurements that the ester groups in the acrylate‐containing copolymers hydrolyze in alkaline conditions, and thus additional RCOO − groups are continuously produced. The gradual production of RCOO − leads to increasing charge density and hence increasing adsorption of the polymer on the cement surface. The hydrolysis of HEA units is slightly faster than of HPA units in the corresponding copolymers. By this mechanism, a post‐acting, or delayed, dispersing effect is realized. Such post‐acting polymers alone or formulated with normal polycarboxylate superplasticizer can be used achieve a long fluidity retention of fresh concrete, especially under elevated temperatures. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45753." @default.
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• W2762189964 date "2017-10-05" @default.
• W2762189964 modified "2023-10-12" @default.
• W2762189964 title "Working mechanism of post-acting polycarboxylate superplasticizers containing acrylate segments" @default.
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• W2762189964 doi "https://doi.org/10.1002/app.45753" @default.
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