Adsorption properties of poly(carboxylate ether) to negatively charged surfaces in high-salt conditions
作者： Bo Wu , Byong-Wa Chun , Le Gu , Tonya L. Kuhl
DOI: 10.1016/J.CEMCONRES.2019.02.003
关键词:
摘要: Abstract Interaction forces between negatively charged surfaces in high-salt solutions with three commercial cement dispersants, poly(carboxylate ether)-based (PCE) superplasticizer consisting of a carboxylic backbone and grafted poly(ethylene glycol) (PEG) side chains, were directly measured subnanometer resolution using surface apparatus. Low molecular weight PCE adsorbed onto mica from 0.1 M K2SO4 due to K+ ion chelation by PEG chains. Surprisingly, higher PCEs did not. Moreover, none the either pore solution conditions saturated Ca(OH)2 or high-calcium Ca(NO3)2. In addition, low not adsorb silica conditions. These findings are attributed complex interplay electrostatic binding screening interactions presence monovalent divalent counterions, suggest role for non-adsorbed polymer paste workability.
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