The interpenetration polymer network in a cement paste–waterborne epoxy system

doi:10.1016/j.cemconres.2020.106236

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	The interpenetration polymer network in a cement paste–waterborne epoxy system
	Pang, Bo 3,5,6; Jia, Yantao 2; Pang, Sze Dai 3; Zhang, Yunsheng 4,5,6; Du, Hongjian 3; Geng, Guoqing 3; Ni, Henmei 7; Qian, JiaJia 5,6; Qiao, Hongxia 4; Liu, Guojian 1
	2021
关键词	Calcium silicate Composite structures Epoxy resins Molecular dynamics TexturesCement based composites Cement based material Degree of polymerization Interaction parameters Interpenetrating polymer network (IPN) Performance prediction Water-borne epoxy resins Water-to-cement ratios
卷号	139
DOI	10.1016/j.cemconres.2020.106236
英文摘要	The formation of the interpenetrating polymer network (IPN) structure within the cement-polymer system has been revealed by experiments from 2 dimensional to 3-dimensional scales. However, the microstructure design and performance prediction of IPN as a function of specific C-S-H/polymer components or ingredients' parameters e.g. water to cement ratios (w/c), polymer to cement ratios (p/c), monomer components, degree of polymerization (DP), etc. is by far not available. Here we developed a mesoscale model for IPN visualization based on the Flory-Huggins interaction theory which was applied to cement science for the first time. All the ingredients in the micro-structure were considered as soluble beads with rational sizes based on their properties obtained by molecular dynamic methods. The interaction parameters of each bead were then determined based on their element ratios and chemical backbones. The model was validated with the waterborne epoxy-cement material (WECM) in which a novel waterborne epoxy resin (WEP) was prepared and impregnated. The verification results on the 2D-3D scale show that the developed model predicts the WECM's IPN structures by rule and line concerning DP, w/c, and p/c in the mixture. The C-S-H beads were progressively scaled in size which alters the C-S-H texture to have completely different dissolution characteristics. Beads of diameter ~6 Å are more unstable and soluble which enable them to form a continuous phase in water or a composite structure with WEP. In contrast, beads with diameters larger than 10 Å have different properties with stronger nucleation effects. The results also suggest the impregnation content of WEP in cement-based material should be limited to 10% vol. to prevent the polymer IPN from decomposing into discrete clusters. The application of Flory-Huggins theory in cement-based composites demonstrates great potential in performance prediction and microstructure design. © 2020
会议录	Cement and Concrete Research
会议录出版者	Elsevier Ltd
语种	英语
ISSN号	00088846
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132702]
专题	土木工程学院
作者单位	1.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou; 215011, China 2.College of Mechanics and Materials, Hohai University, Nanjing; 211189, China; 3.Department of Civil and Environmental Engineering, National University of Singapore, E1 Engineering Drive 2, Singapore; 117 576, Singapore; 4.College of civil engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 5.School of Materials Science and Engineering, Southeast University, Nanjing; 211189, China; 6.Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing; 211189, China; 7.School of Chemistry and Chemical Engineering, Southeast University, Nanjing; 211189, China;
推荐引用方式 GB/T 7714	Pang, Bo,Jia, Yantao,Pang, Sze Dai,et al. The interpenetration polymer network in a cement paste–waterborne epoxy system[C]. 见:.