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Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste
To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) pol...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10056578/ https://www.ncbi.nlm.nih.gov/pubmed/36984075 http://dx.doi.org/10.3390/ma16062190 |
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author | Dong, Lei Meng, Fei Feng, Pan Ran, Qianping Pan, Chonggen He, Jianming |
author_facet | Dong, Lei Meng, Fei Feng, Pan Ran, Qianping Pan, Chonggen He, Jianming |
author_sort | Dong, Lei |
collection | PubMed |
description | To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and demonstrated in cement paste system for improving the resistance to water absorption without significantly reducing 28-day compressive strength. Firstly, the dissolved PS-b-PAA was added into water, and it quickly self-assembled into amphiphilic 80 nm-sized micelles with hydrophobic polystyrene-based core and hydrophilic poly(acrylic acid)-based shell. The improved dispersion compared to that of polystyrene emulsion may minimize the inhibiting effects on strength development, as the effects of PS-b-PAA micelle as hydrophobic admixtures on rheological properties, compressive strength, water absorption, hydration process, and pore structure of 28-day cement pastes were subsequently investigated. In comparison with the control sample, the saturated water absorption amount of cement pastes with 0.4% PS-b-PAA was reduced by 20%, and the 28-day compressive strength was merely reduced by 2.5%. Besides, the significantly increased hydrophobicity instead of slightly decreased porosity of cement paste with PS-b-PAA may contribute more to the reduced water adsorption characteristics. The study based on prepared PS-b-PAA micelle suggested a promising alternative strategy for fabricating polystyrene-modified concrete with reduced water absorption and unaffected compressive strength. |
format | Online Article Text |
id | pubmed-10056578 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-100565782023-03-30 Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste Dong, Lei Meng, Fei Feng, Pan Ran, Qianping Pan, Chonggen He, Jianming Materials (Basel) Article To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and demonstrated in cement paste system for improving the resistance to water absorption without significantly reducing 28-day compressive strength. Firstly, the dissolved PS-b-PAA was added into water, and it quickly self-assembled into amphiphilic 80 nm-sized micelles with hydrophobic polystyrene-based core and hydrophilic poly(acrylic acid)-based shell. The improved dispersion compared to that of polystyrene emulsion may minimize the inhibiting effects on strength development, as the effects of PS-b-PAA micelle as hydrophobic admixtures on rheological properties, compressive strength, water absorption, hydration process, and pore structure of 28-day cement pastes were subsequently investigated. In comparison with the control sample, the saturated water absorption amount of cement pastes with 0.4% PS-b-PAA was reduced by 20%, and the 28-day compressive strength was merely reduced by 2.5%. Besides, the significantly increased hydrophobicity instead of slightly decreased porosity of cement paste with PS-b-PAA may contribute more to the reduced water adsorption characteristics. The study based on prepared PS-b-PAA micelle suggested a promising alternative strategy for fabricating polystyrene-modified concrete with reduced water absorption and unaffected compressive strength. MDPI 2023-03-09 /pmc/articles/PMC10056578/ /pubmed/36984075 http://dx.doi.org/10.3390/ma16062190 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Dong, Lei Meng, Fei Feng, Pan Ran, Qianping Pan, Chonggen He, Jianming Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title | Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title_full | Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title_fullStr | Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title_full_unstemmed | Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title_short | Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste |
title_sort | effects of an amphiphilic micelle of diblock copolymer on water adsorption of cement paste |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10056578/ https://www.ncbi.nlm.nih.gov/pubmed/36984075 http://dx.doi.org/10.3390/ma16062190 |
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