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Title: Research on the chemical mechanism in the polyacrylate latex modified cement system

In this paper, the chemical mechanism in the polyacrylate latex modified cement system was investigated by Fourier transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS), gel permeation chromatography (GPC) and compact pH meter. All results have shown that the chemical reactions in the polyacrylate modified system can be divided into three stages. The hydration reactions of cement can produce large amounts of Ca(OH){sub 2} (calcium hydroxide) and lead the whole system to be alkali-rich and exothermic at the first stage. Subsequently, this environment can do great contributions to the hydrolysis of ester groups in the polyacrylate chains, resulting in the formation of carboxyl groups at the second stage. At the third stage, the final crosslinked network structure of the product was obtained by the reaction between the carboxyl groups in the polyacrylate latex chains and Ca(OH){sub 2}.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ; ; ;  [1]
  1. The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22475523
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 76; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM HYDROXIDES; CEMENTS; CROSS-LINKING; FOURIER TRANSFORMATION; GEL PERMEATION CHROMATOGRAPHY; HYDRATION; HYDROLYSIS; INFRARED SPECTRA; LATEX; PH VALUE; POLYACRYLATES; X-RAY PHOTOELECTRON SPECTROSCOPY