Synthesis and Performance of Polycarboxylate Superplasticizer Based on a Novel Redox System of Manganese Dioxide/Acid
This study aims to develop a novel redox system based on manganese dioxide (MnO₂)/acid for synthesizing polycarboxylate superplasticizers (MPCE) via solution copolymerization of acrylic acid (AA) and methallyl polyoxyethylene ethers (TPEG). The performance of MPCE synthesized using MnO₂ combined wit...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Kaunas University of Technology
2025-06-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | https://matsc.ktu.lt/index.php/MatSc/article/view/40831 |
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| Summary: | This study aims to develop a novel redox system based on manganese dioxide (MnO₂)/acid for synthesizing polycarboxylate superplasticizers (MPCE) via solution copolymerization of acrylic acid (AA) and methallyl polyoxyethylene ethers (TPEG). The performance of MPCE synthesized using MnO₂ combined with different acids (citric acid, tartaric acid, oxalic acid) was compared with two conventional redox systems: ascorbic acid (VC)/H₂O₂ and ammonium persulfate. The MnO₂/citric acid system proved most effective, attributed to its one-step reaction to generate primary free radicals. Optimal reaction conditions were determined as a molar ratio of AA to TPEG (Mn=2400) of 3.5:1.0 and [MnO₂]:[citric acid] of 1:1. The longer side chains of MPCE enhanced adsorption on cement particles and dispersing performance via steric hindrance. Cement paste containing MPCE-2400 showed superior dispersing ability, retention capacity, clay resistance, and hardened mechanical properties. The findings highlight the critical role of the MnO₂/acid redox system in optimizing MPCE synthesis. |
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| ISSN: | 1392-1320 2029-7289 |