Towards the preparation of sustainable superplasticizers for geopolymeric pastes via radiation-induced grafting of sulfonic group-bearing monomers onto corn starch.

Autor: Deghiedy NM; Polymer Chemistry Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, 11787, Cairo, Egypt., El-Gamal SMA; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Ramadan M; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Mohsen A; Faculty of Engineering, Ain Shams University, Abbassia, 11517, Cairo, Egypt., Hazem MM; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Sayed MA; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Helmy FM; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Wetwet MM; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt., Swilem AE; Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt; Chemistry Department, Faculty of Science, Galala University, Galala City, 43511, Suez, Egypt. Electronic address: ahmed_eid@sci.asu.edu.eg.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2024 Oct 01; Vol. 341, pp. 122359. Date of Electronic Publication: 2024 Jun 03.
DOI: 10.1016/j.carbpol.2024.122359
Abstrakt: To address escalating environmental and sustainability concerns of petroleum-based superplasticizers (SPs), this work aims to develop sustainable and eco-friendly starch-based SPs using gamma radiation for maintaining the desired workability of geopolymeric pastes. Specifically, two green SPs were prepared from starch via radiation-induced grafting of two sulfonic group-bearing monomers, namely 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and 4-styrene sulfonic acid sodium salt (Na4SS). The grafting reaction was improved by initial modification of starch with glycidyl methacrylate to insert vinyl groups into the starch backbone. The modified starch samples were characterized by a variety of analytical techniques such as FTIR, 1 H NMR, EDX, SLS, and viscometry. The prepared SPs exhibited high stability in aqueous 5 % NaOH. The effect of the prepared SPs on the fresh properties of GGBFS/MK geopolymer was studied using the mini slump test, zeta potential, adsorption capacity, and setting time. They significantly improved the paste flowability and dispersion compared to the control. Notably, the aromatic Na4SS-grafted starch displayed a comparable enhancement to the commercial PNS, while outperforming the aliphatic AMPS-grafted sample. This emphasizes the potential of these green SPs to address the challenges posed by the petroleum-based SPs and maximize the benefit of using starch as a green renewable resource.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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