Fluidizing effects of polymers with various anchoring groups in cement pastes and their sensitivity to environmental temperatures
Fluidizing effects of polymers with various anchoring groups in cement pastes and their sensitivity to environmental temperatures
复制标题
水泥浆体中具有不同锚定基团的聚合物的流化效应及其对环境温度的敏感性
DOI：
10.1002/app.47494
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发表时间：
2019-05
影响因子：
3
通讯作者：
Huang Chunlong
中科院分区：
文献类型：
--
作者：
Tian Hongwei;Kong Xiangming;Sun Jiangbo;Wang Dongmin;Huang Chunlong
我们合成了各种具有不同官能团的聚合物，包括：<$COO-、<$SO3-和<$N+<$，以通过测量新拌水泥浆体的流动性、总有机碳、水化电位和等温量热法来研究环境温度（25、50和80 °C）对分散能力的影响。结果表明，对于含有丙烯酸、2-丙烯酰胺基-2-甲基丙磺酸和[3-（甲基丙烯酰氨基）丙基]三甲基氯化铵的水泥浆体，没有观察到吸附，可能是因为微量的吸附，而浆体的流动性确实通过添加这些化学品而得到改善。一般来说，对于含不同官能团的聚合物，吸附能力的顺序为：<$COO-><$SO3-><$N+<$。羧酸盐高效减水剂的分散能力对温度的变化具有鲁棒性，而磺酸盐高效减水剂的分散能力随温度的升高而显著减弱，但吸附量沿着增加。© 2019 Wiley Periodicals，Inc. J.应用聚合物Sci.2019，136，47494.
We synthesized various polymers with different functional groups of ─COO−, ─SO3−, and ≡N+─ to study the impact of the environmental temperature (25, 50, and 80 °C) on the dispersing capability by measuring the fluidity of fresh cement paste, total organic carbon, ζ potential, and isothermal calorimetry. The results show that no adsorption was observed for the cement pastes containing acrylic acid, 2‐acrylamido‐2‐methyl propane sulfonic acid, and [3‐(methacryloylamino)propyl] trimethyl ammonium chloride, probably because of the trace amount of adsorption, whereas the fluidity of the pastes was indeed improved by the addition of these chemicals. Generally, for the polymers containing various functional groups, the adsorption capability was in the order ─COO−> ─SO3−> ≡N+─. The dispersing capability for the carboxylate superplasticizer was robust to the change in the temperature, whereas it was dramatically weakened by the increase in temperature for sulfonate superplasticizer, although the adsorption amount increased along with the temperature rise. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47494.
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