纳米二氧化硅改性短支链烯丙基聚羧酸酯高效减水剂的制备与性能研究

Lei Qiu, Chunfeng Mao, Jiaqi Zhang, Yanyun Wang, S. Ge, Rundong Wang, Yuzhong Huang, Yuming Zhou
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引用次数: 0

摘要

纳米粒子与聚羧酸醚减水剂的结合有望同时提高砂浆和混凝土的耐久性和力学性能。然而,纳米颗粒在水泥材料中的均匀分散一直是一个难题。本文采用表面活性剂对纳米颗粒进行改性,为纳米颗粒在胶凝材料中更好的分散提供了研究方向。以丙烯酸和烯丙基缩水甘油醚为原料合成了短支链改性烯丙基醚聚羧酸酯高效减水剂。通过分子间脱水将纳米二氧化硅接枝到聚羧酸酯醚分子链上,得到纳米二氧化硅/聚羧酸酯醚,实现了纳米二氧化硅在胶凝材料中的均匀分散。结果表明,纳米二氧化硅/聚羧酸酯醚在水泥基体中具有较好的分散性和较强的抗粘土性,弥补了传统聚乙二醇接枝链合成的聚羧酸酯醚在粘土杂质存在下分散性差的缺陷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation and properties of allyl ether-based polycarboxylate superplasticizer with short-branched chains modified by nano-silica
The combination of nanoparticles and polycarboxylate ether superplasticizers is expected to simultaneously improve the durability and mechanical properties of mortar and concrete. However, the uniform dispersion of nanoparticles in cement materials has always been a difficult challenge. In this paper, nanoparticles are modified with surfactants to provide a research direction for better dispersion of nanoparticles in cementitious materials. Modified allyl ether polycarboxylate superplasticizer with short-branched chains was synthesized from acrylic acid and allyl glycidyl ether. Nano-silica/polycarboxylate ether was obtained by grafting nano-silica onto polycarboxylate ether molecular chains through intermolecular dehydration, thus achieving a homogeneous dispersion of nano-silica in the cementitious material. The results show that nano-silica/polycarboxylate ether has better dispersibility in cement matrix and strong clay resistance, which compensates for the poor dispersion of polycarboxylate ether synthesized from conventional polyethylene glycol graft chains in the presence of clay impurities.
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来源期刊
Journal of Chemical Research-s
Journal of Chemical Research-s 化学科学, 有机化学, 有机合成
自引率
0.00%
发文量
0
审稿时长
1 months
期刊介绍: The Journal of Chemical Research is a peer reviewed journal that publishes full-length review and research papers in all branches of experimental chemistry. The journal fills a niche by also publishing short papers, a format which favours particular types of work, e.g. the scope of new reagents or methodology, and the elucidation of the structure of novel compounds. Though welcome, short papers should not result in fragmentation of publication, they should describe a completed piece of work. The Journal is not intended as a vehicle for preliminary publications. The work must meet all the normal criteria for acceptance as regards scientific standards. Papers that contain extensive biological results or material relating to other areas of science may be diverted to more appropriate specialist journals. Areas of coverage include: Organic Chemistry; Inorganic Chemistry; Materials Chemistry; Crystallography; Computational Chemistry.
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