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Polymers
Volume 13
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10.3390/polym13183069
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Article

Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties

by
Xiao Liu
1,*,
Xiaofei Song
1,
Ziming Wang
1,
Chunlei Xia
2,
Ting Li
3,
Xiaoning Li
3,
Qian Xu
1,4,
Suping Cui
1,5 and
Shanshan Qian
1,6
1
Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China
2
Beijing Municipal Engineering Research Institute, Beijing 100037, China
3
CNBM Zhongyan Technology Co., Ltd., Beijing 100024, China
4
China Building Material Test & Certification Group Co., Ltd., China Building Materials Academy, Beijing 100024, China
5
Faculty of Materials and Manufacturing, National Engineering Laboratory for Industrial Big-Data Application Technology, Beijing University of Technology, Beijing 100124, China
6
Jiangsu ARIT New Materials Co., Ltd., Nanjing 211505, China
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(18), 3069; https://doi.org/10.3390/polym13183069
Submission received: 13 August 2021 / Revised: 7 September 2021 / Accepted: 7 September 2021 / Published: 11 September 2021
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Abstract

A series of novel comb-like poly(butyl acrylate)-g-poly(dimethylaminoethyl methacrylate) (PBA-g-PDMAEMA) with different side chain lengths were designed and successfully synthesized by the “first main chain then side chain” method. Infrared Spectroscopy (IR), 1H Nuclear Magnetic Resonance (1H NMR), and gel permeation chromatography (GPC) were used for structural confirmation and molecular weight characterization. This polymer exhibited responsive behavior from hydrophilicity to hydrophobicity under the alkaline environment of cement-based materials, with the contact angle of 105.6°, a decreased evaporation rate, and a hydrophile–lipophile balance (HLB) value. A significant internal hydrophobic effect on cement mortar was shown in the water absorption rate, which decreased by 75.2%, and a dry shrinkage-reducing rate of more than 30%. Furthermore, this polymer can effectively slow the exothermic rate, reduce the heat release, and delay the exothermic peak of cement hydration. It was interesting that these properties showed a direct correlation with the side chain length of the comb polymer. The aims of this study are to provide a new avenue to synthesize polymers with the spontaneous hydrophilicity–hydrophobicity transition in the cement system, achieving excellent internal hydrophobicity of cement-based materials, and to offer a promising alternative to resist external erosion for improving the durability and service life of cement-based materials.
Keywords: hydrophilicity–hydrophobicity conversion; internal hydrophobicity; molecular design; cement-based material; hydration hydrophilicity–hydrophobicity conversion; internal hydrophobicity; molecular design; cement-based material; hydration
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MDPI and ACS Style

Liu, X.; Song, X.; Wang, Z.; Xia, C.; Li, T.; Li, X.; Xu, Q.; Cui, S.; Qian, S. Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties. Polymers 2021, 13, 3069. https://doi.org/10.3390/polym13183069

AMA Style

Liu X, Song X, Wang Z, Xia C, Li T, Li X, Xu Q, Cui S, Qian S. Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties. Polymers. 2021; 13(18):3069. https://doi.org/10.3390/polym13183069

Chicago/Turabian Style

Liu, Xiao, Xiaofei Song, Ziming Wang, Chunlei Xia, Ting Li, Xiaoning Li, Qian Xu, Suping Cui, and Shanshan Qian. 2021. "Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties" Polymers 13, no. 18: 3069. https://doi.org/10.3390/polym13183069

APA Style

Liu, X., Song, X., Wang, Z., Xia, C., Li, T., Li, X., Xu, Q., Cui, S., & Qian, S. (2021). Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties. Polymers, 13(18), 3069. https://doi.org/10.3390/polym13183069

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