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	树枝状聚酰胺在水泥颗粒表面的吸附性能及对水泥浆体性能的影响
	孔祥明 ; 候珊珊 ; 卢子臣 ; KONG Xiangming ; HOU Shanshan ; LU Zichen
	2016-03-30 ; 2016-03-30
关键词	水泥 减水剂 树枝状结构 端基 繁衍代 TU528.042.2
其他题名	Effect of Dendrimeric Polyamide on Fluidity of Cement Paste,Cement Hydration and Their Adsorption in Cement Paste
中文摘要	以乙二胺与丙烯酸甲酯为单体,通过交替进行Michael加成反应和酰胺化缩合反应,制得了繁衍代(同心支化官能团数)为0.5~3.5、端基分别为酯基与胺基的具有树枝状分子结构的聚酰胺。通过红外光谱与核磁共振谱证实了合成分子结构与设计一致。通过酯基在碱性条件下水解生成羧基,制得端基为羧基的0.5~3.5代树枝状分子。研究了端基分别为胺基、酯基与羧基不同繁衍代的树枝状分子对水泥净浆流动度、水泥净浆zeta电位和水泥水化过程的影响及其在水泥表面的吸附性能。结果表明:端基为羧基和酯基的树枝状分子可以吸附在水泥颗粒上,并显著降低水泥颗粒表面zeta电位;代数越高,zeta电位降低越明显,对水泥净浆分散能力越强,证实了树枝状分子作为水泥基材料减水剂的潜在可行性;端基为胺基的树枝状聚酰胺对水泥水化过程几乎无影响,而端基为酯基和羧基的树枝状聚酰胺对水泥水化表现出明显的缓凝作用,代数越大,缓凝作用越强。; Dendrimeric polyamide was synthesized viathe alternation of the Michael addition reaction and the amidation condensation reaction when ethylenediamine and methyl acrylate were used as monomers.The different generations of dendrimers from0.5to 3.5were synthesized with either ester group or amino group as end groups.The molecular structure of the synthesized dendrimer was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance.The dendrimers with carboxyl groups as end groups were prepared viathe hydrolysis reaction of ester groups in alkaline.The effect of dendrimers with varied generations and different end groups(i.e.,amino,eater and carboxyl groups)on the fluidity of fresh cement pastes(fcps),zeta potential of the fcps,cement hydration kinetics and their adsorption behavior in the fcps was investigated.The results show that the dendrimers with carboxyl end groups and ester end groups can be efficiently absorbed on the cement particles and decrease the zeta potential of the fcps to a negative value from 6mV for the blank cement paste.The greater generation of the dendrimers has a lower zeta potential of the fcps,showing a better dispersive capability for cement particles.It is indicated that the dendrimers can act as a superplasticizer in cementitious materials.The dendrimers with end groups of amino group hardly affect the cement hydration process,but the dendrimers with end groups of ester and carboxyl groups obviously retard the cement hydration process.The greater generation of dendrimers shows a retardation effect on cement hydration.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/149090]
专题	清华大学
推荐引用方式 GB/T 7714	孔祥明,候珊珊,卢子臣,等. 树枝状聚酰胺在水泥颗粒表面的吸附性能及对水泥浆体性能的影响[J],2016, 2016.
APA	孔祥明,候珊珊,卢子臣,KONG Xiangming,HOU Shanshan,&LU Zichen.(2016).树枝状聚酰胺在水泥颗粒表面的吸附性能及对水泥浆体性能的影响..
MLA	孔祥明,et al."树枝状聚酰胺在水泥颗粒表面的吸附性能及对水泥浆体性能的影响".(2016).

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