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聚羧酸系减水剂对石墨烯分散性的影响

王琴 詹达富 齐国栋 王悦 郑海宇

王琴, 詹达富, 齐国栋, 王悦, 郑海宇. 聚羧酸系减水剂对石墨烯分散性的影响[J]. 新型炭材料, 2020, 35(5): 547-558. doi: 10.1016/S1872-5805(20)60508-X
引用本文: 王琴, 詹达富, 齐国栋, 王悦, 郑海宇. 聚羧酸系减水剂对石墨烯分散性的影响[J]. 新型炭材料, 2020, 35(5): 547-558. doi: 10.1016/S1872-5805(20)60508-X
WANG Qin, ZHAN Da-fu, QI Guo-dong, WANG Yue, ZHENG Hai-yu. Impact of the microstructure of polycarboxylate superplasticizers on the dispersion of graphene[J]. NEW CARBON MATERIALS, 2020, 35(5): 547-558. doi: 10.1016/S1872-5805(20)60508-X
Citation: WANG Qin, ZHAN Da-fu, QI Guo-dong, WANG Yue, ZHENG Hai-yu. Impact of the microstructure of polycarboxylate superplasticizers on the dispersion of graphene[J]. NEW CARBON MATERIALS, 2020, 35(5): 547-558. doi: 10.1016/S1872-5805(20)60508-X

聚羧酸系减水剂对石墨烯分散性的影响

doi: 10.1016/S1872-5805(20)60508-X
基金项目: 北京市自然科学基金资助项目(8182014).
详细信息
    通讯作者:

    王琴,副教授.E-mail:wangqin@bucea.edu.cn

  • 中图分类号: TB33

Impact of the microstructure of polycarboxylate superplasticizers on the dispersion of graphene

Funds: Beijing Natural Science Foundation Funded Project (8182014).
  • 摘要: 石墨烯用于水泥基材料不仅可以起到增强增韧作用,还可以提高水泥基体的自感应能力,石墨烯的均匀分散是其在水泥基体中应用的瓶颈问题。在本研究中,笔者合成了4种电荷密度和侧链长度不同的聚羧酸类减水剂(PCEs)。利用紫外分光光谱仪、动态光散射仪、超景深光学显微镜等方法研究了不同结构PCEs对石墨烯分别在去离子水体系和水泥孔溶液体系中分散性的影响,并提出了石墨烯的分散机理。结果表明,在去离子水体系中,高电荷密度的PCE具有更高的静电排斥力,更有利于石墨烯的分散;而具有较低电荷密度和较长侧链的PCE降低了石墨烯的分散性。相反,在水泥孔溶液体系中,对于高电荷密度PCE,由于聚羧酸基团与Ca2+的桥接效应,降低了PCE间库仑力的排斥作用,从而降低了石墨烯的分散性;对于低电荷密度的PCE,由于聚羧酸基团与Ca2+的桥接效应不显著,空间位阻发挥主要作用,石墨烯分散性较好。此外,具有较长侧链的PCE在两种体系中均表现出较差的分散效率。总体来说,具有低电荷密度和较短侧链的PCE更适合于制备石墨烯水泥复合材料。
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出版历程
  • 收稿日期:  2019-10-23
  • 修回日期:  2020-04-28
  • 刊出日期:  2020-10-28

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