Synthesis and Properties of a Vinyl Ether-Based Polycarboxylate Superplasticizer for Concrete Possessing Clay Tolerance
Synthesis and Properties of a Vinyl Ether-Based Polycarboxylate Superplasticizer for Concrete Possessing Clay Tolerance
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DOI：
10.1021/ie4035913
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发表时间：
2014-01
影响因子：
4.2
通讯作者：
L. Lei;J. Plank
中科院分区：
文献类型：
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作者：
L. Lei;J. Plank
具有聚乙二醇（PEG）接枝链的常见聚羧酸醚（PCE）高效减水剂对混凝土骨料和石灰石粉中所含的粘土杂质表现出高敏感性。粘土的存在大大削弱了它们的分散能力。以马来酸酐（MA）和4-羟基丁基乙烯基醚（HBVE）为原料，合成了改性的乙烯基醚基PCE。我们发现，这两种单体的成功共聚取决于引入至少100%重量的马来酸单烷基酯作为辅助共聚单体。所得的三元共聚物进行了表征，并测试了它们在水泥浆体中的分散能力，在存在和不存在的蒙脱土。MA-马来酸单烷基酯-HBVE三元共聚物受蒙脱土的影响很小。吸附测量和X-射线衍射分析表明，这种新型的PCE与蒙脱土的相互作用，只有通过表面吸附，而传统的PCE具有PEG接枝链纳入ch.
Common polycarboxylate ether (PCE) superplasticizers that possess polyethylene glycol (PEG) graft chains exhibit high sensibility toward clay impurities contained in concrete aggregates and limestone powder. The presence of clay greatly weakens their dispersing ability. In this study, modified vinyl ether-based PCEs were synthesized from maleic anhydride (MA) and 4-hydroxy butyl vinyl ether (HBVE). We found that successful copolymerization of these two monomers is dependent on incorporation of at least ∼30 wt % of a maleic monoalkyl ester as an auxiliary comonomer. The resulting terpolymers were characterized and tested for their dispersing ability in cement paste in the absence and presence of montmorillonite. The MA–monoalkyl maleate–HBVE terpolymers are little affected by montmorillonite. Sorption measurements and X-ray diffraction analysis suggest that this novel type of PCE interacts with montmorillonite only via surface adsorption, whereas conventional PCEs possessing PEG graft chains incorporate ch...