Preparation and Characterization of Microcrystalline Wax/Epoxy Resin Microcapsules for Self-Healing of Cementitious Materials

被引：19
作者：
Du, Wei [1 ,2 ]
Liu, Quantao [2 ]
Lin, Runsheng [3 ]
Su, Xin [1 ]
机构：
[1] Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Peoples R China
[2] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[3] Kangwon Natl Univ, Dept Architectural Engn, Coll Engn, Chuncheon Si 200701, South Korea
来源：
MATERIALS | 2021年 / 14卷 / 07期
关键词：
cementitious materials; microcapsules; melt– dispersion– condensation method; microcrystalline wax; self-healing;
D O I：
10.3390/ma14071725
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Self-healing of cracks in cementitious materials using healing agents encapsulated in microcapsules is an intelligent and effective method. In this study, microcapsules were prepared by the melt-dispersion-condensation method using microcrystalline wax as the shell and E-51 epoxy resin as the healing agent. The effects of preparation process parameters and microcrystalline wax/E-51 epoxy resin weight ratio on the core content, particle size distribution, thermal properties, morphology, and chemical composition of microcapsules were investigated. The results indicated that the optimal parameters of the microcapsule were microcrystalline wax/E-51 epoxy resin weight ratio of 1:1.2, stirring speed of 900 rpm, and preparation temperature of 105 degrees C. The effects of microcapsules on pore size distribution, pore structure, mechanical properties, permeability, and ultrasonic amplitude of mortar were determined, and the self-healing ability of mortar with different contents of microcapsules was evaluated. The optimal content of microcapsules in mortars was 4% of the cement weight, and the surface cracks of mortar containing microcapsules with an initial width of 0.28 mm were self-healed within three days, indicating that microcapsules have excellent self-healing ability for cementitious materials.
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页数：24
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