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Synthesis and characteristics of pectiniform polyurethane‐modified polycarboxylate and its effects on behavior of cement paste
Author(s) -
Xiang Shuncheng,
Gao Yingli
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49802
Subject(s) - adsorption , zeta potential , materials science , chemical engineering , cement , polymerization , siloxane , surface tension , cementitious , alkyl , composite material , hydrolysis , polymer chemistry , organic chemistry , polymer , chemistry , physics , quantum mechanics , nanoparticle , engineering , nanotechnology
In this research, two kinds of polycarboxylate (M‐PCE and O‐PCE) with the same degree of polymerization in side chains but different main chains were synthesized via a radical polymerization reaction at room temperature. Along with two commercial polycarboxylates (C‐PCE‐1 and C‐PCE‐2), their properties on adsorption, hydration, zeta potential, liquid surface tension, and flowability of cement pastes were investigated. The results showed that the adsorption of M‐PCE on the surface of cement particles increased 14.1% and the adsorption rate increased 24% compared with C‐PCEs. Furthermore, three polycarboxylates (O‐PCE, C‐PCE‐1, and C‐PCE‐2) exhibited a delayed effect on the hydration of cement due to the shielding effect of their chain alkyl groups, meanwhile the hydration of the cementitious materials by the M‐PCE was not delayed but promoted because of its incomplete hydrolysis of the siloxane. As a result of the higher adsorption amount, M‐PCE with siloxane groups exhibited favorable effects in terms of zeta potential, liquid surface tension, and flowability of cement pastes.