分散剂对石墨烯水泥基复合材料压敏性能的影响研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2515-2526.

分散剂对石墨烯水泥基复合材料压敏性能的影响研究

王悦, 王琴, 郑海宇, 詹达富

北京建筑大学土木与交通工程学院,建筑结构与环境修复功能材料北京市重点实验室,北京 100044

收稿日期:2021-05-18 修回日期:2021-05-28 出版日期:2021-08-15 发布日期:2021-09-02
通讯作者: 王琴,博士,副教授。E-mail:wangqin@bucea.edu.cn
作者简介:王悦(1996—),女,硕士研究生。主要从事水泥基复合材料的研究。E-mail:525216608@qq.com
基金资助:
北京市自然科学基金项目面上项目(8182014)

Influence of Dispersant on Pressure-Sensitive Properties of Graphene Cement-Based Composites

WANG Yue, WANG Qin, ZHENG Haiyu, ZHAN Dafu

Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Received:2021-05-18 Revised:2021-05-28 Online:2021-08-15 Published:2021-09-02

摘要/Abstract

摘要： 石墨烯能显著改善水泥基复合材料的压敏性能,而分散剂是影响石墨烯分散以及复合材料性能的关键因素。本文通过紫外分光光度仪、超景深显微镜、激光粒度仪及Zeta电位测试,研究了聚羧酸减水剂(PCE)、聚氧乙烯(20)山梨醇酐单月桂酸酯(TW-20)、十二烷基磺酸钠(SDS)、十二烷基苯磺酸钠(SDBS)4种分散剂对石墨烯分散性能的影响,并通过直流二电极、直流四电极和交流二电极测试研究了4种分散剂对石墨烯水泥基复合材料导电性能和压敏性能的影响。结果表明:在去离子水和水泥孔溶液中,PCE由于静电斥力和空间位阻的协同作用,对石墨烯具有良好的分散性;而在水泥孔溶液中,TW-20、SDS、SDBS与Ca²⁺之间的络合作用导致分散效率显著下降。石墨烯水泥基复合材料的导电和压敏性能与石墨烯在水泥基体中的分散性密切相关,掺PCE的石墨烯水泥基复合材料的电阻率最小,压敏性能最优。另外,SDS、SDBS的引气作用也会影响水泥基体的孔结构,导致电阻率增大,压敏性变差。

关键词: 石墨烯, 分散性, 压敏性能, 导电性能, 微观结构, 相容性

Abstract: Graphene can significantly improve the smart performance of cement-based composites, and dispersants are a key factor affecting the dispersion of graphene and the performance of composites. In this paper, through ultraviolet (UV) spectrophotometer, ultra-depth-of-field microscope, laser particle size analyzer and Zeta potential test, the polycarboxylate water reducing agent (PCE), polyoxyethylene (20) sorbitan monolaurate (TW-20), sodium dodecyl sulfonate (SDS) and sodium dodecyl benzene sulfonate (SDBS) on the dispersion properties of graphene were studied. The effects of four dispersants on the conductivity and pressure-sensitive properties of graphene cement-based composites were studied through DC two-electrode, DC four-electrode and AC two-electrode tests. The results show that in deionized water and cement pore solution, PCE has good dispersibility for graphene due to the synergistic effect of electrostatic repulsion and steric hindrance. In the cement pore solution, the complexation between TW-20, SDS, SDBS and Ca²⁺ leads to a significant decrease in dispersion efficiency. The conductivity and pressure-sensitive properties of graphene cement-based composites are closely related to the dispersion of graphene in the cement matrix. Graphene cement-based composites doped with PCE have the smallest resistivity and the best pressure-sensitive properties. In addition, the air-entraining effects of SDS and SDBS also affect the pore structure of the cement matrix, resulting in increased resistivity and poor pressure sensitivity.

Key words: graphene, dispersibility, pressure-sensitive property, electrical conductivity, microstructure, compatibility

中图分类号:

TU525.9

王悦, 王琴, 郑海宇, 詹达富. 分散剂对石墨烯水泥基复合材料压敏性能的影响研究[J]. 硅酸盐通报, 2021, 40(8): 2515-2526.

WANG Yue, WANG Qin, ZHENG Haiyu, ZHAN Dafu. Influence of Dispersant on Pressure-Sensitive Properties of Graphene Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2515-2526.

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