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| 1 | 聚羧酸减水剂的合成及性能(Ⅰ)以丙烯酸双酯为交联剂缓释型减水剂显示文摘以甲基烯丙基聚氧乙烯醚(TPEG)、丙烯酸(AA)为原料,以聚乙二醇二丙烯酸酯(PEGDA)为交联剂,采用水溶液自由基聚合,合成了缓释型聚羧酸减水剂。通过在聚羧酸分子中引入可以水解的长链酯类交联剂,水泥碱性环境下,酯基发生水解后释放出羧基,起到二次分散作用,显著提高了水泥的经时流动度。加入0.168g交联剂后,初始流动度不变,但比不加交联剂的聚羧酸减水剂2.5h经时流动度增加20 mm。该缓释型减水剂与粉煤灰、矿渣单掺以及与粉煤灰和矿渣双掺后对水泥砂浆体系具有较好的相容性。 | 刘海露 庞浩 廖兵 黄健恒 郑景新 程劲松 周林 | 2014 | 绿色建筑2014，6，3： | 4 |
| 2 | Preparation of Polycarboxylate-based Superplasticizer and Its Effects on Zeta Potential and Rheological Property of Cement Paste显示文摘A series of polycarboxylate-based superplasticizers(PCs) with different structures were synthesized and the effects of chemical structure on zeta potential and rheological property of cement paste were studied. Residual monomers in each sample of PCs were quantitatively determined. The property of the polymers in cement was tested by micro-electrophoresis apparatus and R/S rheometer. Results showed that the zeta potential and its rheological properties are related with the side-chain length and density of PCs. The PCs having shorter side chain and lower side chain density exhibit higher anionic charge density, thus resulting in higher zeta potential. The effect of side chain density on zeta potential is more notable compared with that of side-chain length, and thus affecting the initial shear yield stress and apparent viscosity of the cement paste. In addition, although increasing the side chain length will result in reduction of the anionic charge density, the steric hindrance effect is obvious, which can effectively improve the dispersion of the cement particles, and reduce the viscosity and shear yield stress of slurry. | 刘明 雷家珩 BI Yao DU Xiaodi ZHAO Qinglin ZHANG Xuqing | 2015 | Journal of Wuhan University of Technology(Materials Science)2015，30，5： | 3 |
| 3 | 超滤和核磁技术定性分析聚羧酸减水剂的大单体显示文摘采用超滤和核磁技术,建立分析未知聚羧酸减水剂中大单体的方法。结果表明,未知聚羧酸减水剂样品依次经过30,10,3 k D(道而顿)超滤膜后,大分子量的组分被逐级滤去;超滤滤液再经过500D的透析袋预处理去除杂质,得到相对较纯的大单体。应用核磁共振氢谱技术对常见的已知大单体进行鉴别分析,进而解析出未知聚羧酸样品使用的大单体为异戊烯醇聚乙二醇醚(TPEG)。该法为聚羧酸高分子样品的剖析提供重要的分析手段,对聚合物的分析具有一定的借鉴作用。 | 李格丽 林倩 方云辉 | 2015 | 中国测试2015，41，7： | 2 |
| 4 | 三臂交联型聚羧酸高效减水剂的制备与性能研究显示文摘以甘油、丙烯酸和甲基烯丙基聚氧乙烯醚为主要原料,通过简单的两步法设计合成了一系列交联程度、分子质量不同的新型三臂交联型聚羧酸高效减水剂(Tri-PCE)和梳状聚羧酸高效减水剂,并采用核磁共振和红外光谱对合成产物的结构进行了表征。净浆和砂浆试验结果表明:与梳形聚羧酸减水剂相比,Tri-PCE的初始分散性及分散保持性略低;在水泥浆中Tri-PCE的吸附量较高,并且饱和吸附量与交联程度正相关;同时,多臂体型的拓扑结构可以有效改善浆体的和易性、增大拌合物的含气量、提高新拌水泥砂浆的工作性能。 | 胡聪 周栋梁 舒鑫 杨勇 | 2021 | 新型建筑材料2021，48，2： | 0 |
| 5 | Microstructural Characteristics Analysis of PCE Copolymer from Methyl Allyl Polyethylene Glycol and Methacrylic Acid based on Determination of Monomer Reactivity Ratios显示文摘The reactivity ratio of monomer and the microstructure of copolymer as polycarboxylate ether(PCE)superplasticizer were investigated.Polycarboxylate ethers(PCEs)were synthesized from methyl allyl polyethylene glycol(MAPEG,Mw=2400 g/mol)and methacrylic acid(MAA)via aqueous free radical copolymerization in low conversion(P<20%).Gel permeation chromatography(GPC)and high performance liquid chromatography(HPLC)were used to track the residual concentration of the reactants and the amount of copolymer formed during the copolymerization.The reactivity ratios of monomers,MAPEG and MAA,were determined as r1(MAPEG)=0.0489 and r2(MAA)=1.6173,respectively,by employing the K-T and YBR methods.According to the obtained monomer reactivity results,the sequence distribution of the copolymer,the number average length of MAA in the polymerisate were found to decline with the decrease of the mole fraction of MAA in the polymerization system.As a result,the distribution of chain segments becomes narrower and the copolymer structure becomes more uniform.Therefore,uniform polymers could be obtained by slowly adding MAA monomer during copolymerization process. | 王子明 康亚欣 PENG Jingying | 2021 | Journal of Wuhan University of Technology(Materials Science)2021，36，2： | 0 |
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