Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization
Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization
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本体聚合粉状聚羧酸减水剂的制备、表征及性能
DOI：
10.3390/ma7096169
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发表时间：
2014-08
期刊：
影响因子：
3.4
通讯作者：
Liang, Xu
中科院分区：
文献类型：
--
作者：
Lan, Mingzhang;Li, Huiqun;Zhu, Jie;Liang, Xu
采用本体聚合法在非溶剂体系中合成了聚羧酸系高效减水剂（PCE），并将其粉碎成粉末状，以实现快速运输和方便制备。以异戊烯基聚乙二醇（TPEG）或异丁烯基聚乙二醇（IPEG）为大分子单体合成的PCE在80 °C和75 °C下分别表现出最佳的流动性和保持性。此外，偶氮二异丁腈（AIBN）是合适的引发剂，富马酸是合适的第三单体。核磁共振氢谱（1H NMR）测试结果证实了聚合反应的发生，分子量及分布的测定结果表明，PCE的分子量特征与其在水泥浆体中的流动性特征相一致。在水泥中的应用性能表明，净浆流动性保持率最好的PCE终凝时间最长，凝结时间间隔最短，流动性好的PCE能明显延缓水化进程，降低水化热。因此，这是一种新型、节能、经济的制备粉末PCE的方法。
A polycarboxylate superplasticizer (PCE) was synthesized in a non-solvent system with bulk polymerization and then was pulverized into powdered form to achieve a rapid transportation and convenient preparation. PCE synthesized by using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as a macromonomer exhibited the best fluidities and retaining properties at 80 °C and 75 °C, respectively. Besides, azobisisobutyronitrile (AIBN) was suitable as an initiator, and the fumaric acid was suitable as the third monomer. The test results of 1H nuclear magnetic resonance (1H NMR) confirmed the occurrences of polymerization, and the measurement results of molecular weight and distribution showed that PCE molecular weight characteristics were in accordance with their fluidity properties in cement paste. The application performances in cement showed that PCEs with the best paste fluidity retentions had the longest final setting time and the shortest setting time interval, and the PCEs with good fluidity properties can obviously delay the hydration process and lower the hydration heat. Accordingly, this is a novel, energy-saving and economical method to prepare powdered PCE in the field of concrete admixtures.
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DOI：
10.4028/www.scientific.net/amm.71-78.677
发表时间：
2011-07
期刊：
Applied Mechanics and Materials
影响因子：
--
作者：
M. Gui;Yunhui Fang;Qingzhang Lin;F. Yu;T. Lin;Xiuxing Ma
通讯作者：
M. Gui;Yunhui Fang;Qingzhang Lin;F. Yu;T. Lin;Xiuxing Ma
DOI：
--
发表时间：
2003
期刊：
--
影响因子：
--
作者：
C. Comparet;A. Nonat;S. Pourchet;M. Mosquet;P. Maitrasse
通讯作者：
C. Comparet;A. Nonat;S. Pourchet;M. Mosquet;P. Maitrasse
影响因子：
11.4
作者：
R. Flatt;P. Bowen
通讯作者：
R. Flatt;P. Bowen
影响因子：
2
作者：
J. Plank;B. Sachsenhauser
通讯作者：
J. Plank;B. Sachsenhauser
影响因子：
4.6
作者：
F. Najafi;M. Sarbolouki
通讯作者：
F. Najafi;M. Sarbolouki