Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of the polymer structure of polycarboxylate-based superplasticizers on the intercalation behaviour in montmorillonite clays
https://orcid.org/0000-0001-7708-3578
Highlights In-situ XRD reveals how the PCE structure influences in the intercalation process. Clay expansion profiles are aligned with fluidity and sorption behavior. PCE with long side chain and high grafting ratio produce larger expansion of clay; high side chain density promote clay exfoliation at lower dosage. PCE with high anionic charge needs lower dosage to saturate the interlaminar space. Exfoliation of clay enhances the interference on PCE performance.
Abstract The influence of polymeric structure of polycarboxylate-ether (PCE) based superplasticizers on the intercalation behavior in sodium montmorillonite clay (Na-MNT) is investigated by performing in-situ X-ray diffraction (XRPD) on fresh, unaltered clay pastes. The use of this technique reveals the real influence of the PCE structure and of the PCE/clay dosage ratio on the expansion profile of the clay. This is not observed with the traditional XRPD methodology performed on dried clay pastes, which shows the same values of d-spacing despite using polymers of diverse structures. It is observed that PCE polymers with long side chains and high side chain density result in larger expansion. Additionally, polymers with a high anionic charge saturate the interlaminar space of montmorillonite at a lower dosage. The experimental results also indicate that clay exfoliation is critical in the intercalation process and the exfoliation tendency of the clay is influenced by the structure of PCE polymers.
Influence of the polymer structure of polycarboxylate-based superplasticizers on the intercalation behaviour in montmorillonite clays
https://orcid.org/0000-0001-7708-3578
Highlights In-situ XRD reveals how the PCE structure influences in the intercalation process. Clay expansion profiles are aligned with fluidity and sorption behavior. PCE with long side chain and high grafting ratio produce larger expansion of clay; high side chain density promote clay exfoliation at lower dosage. PCE with high anionic charge needs lower dosage to saturate the interlaminar space. Exfoliation of clay enhances the interference on PCE performance.
Abstract The influence of polymeric structure of polycarboxylate-ether (PCE) based superplasticizers on the intercalation behavior in sodium montmorillonite clay (Na-MNT) is investigated by performing in-situ X-ray diffraction (XRPD) on fresh, unaltered clay pastes. The use of this technique reveals the real influence of the PCE structure and of the PCE/clay dosage ratio on the expansion profile of the clay. This is not observed with the traditional XRPD methodology performed on dried clay pastes, which shows the same values of d-spacing despite using polymers of diverse structures. It is observed that PCE polymers with long side chains and high side chain density result in larger expansion. Additionally, polymers with a high anionic charge saturate the interlaminar space of montmorillonite at a lower dosage. The experimental results also indicate that clay exfoliation is critical in the intercalation process and the exfoliation tendency of the clay is influenced by the structure of PCE polymers.
Influence of the polymer structure of polycarboxylate-based superplasticizers on the intercalation behaviour in montmorillonite clays
https://orcid.org/0000-0001-7708-3578
Highlights In-situ XRD reveals how the PCE structure influences in the intercalation process. Clay expansion profiles are aligned with fluidity and sorption behavior. PCE with long side chain and high grafting ratio produce larger expansion of clay; high side chain density promote clay exfoliation at lower dosage. PCE with high anionic charge needs lower dosage to saturate the interlaminar space. Exfoliation of clay enhances the interference on PCE performance.
Abstract The influence of polymeric structure of polycarboxylate-ether (PCE) based superplasticizers on the intercalation behavior in sodium montmorillonite clay (Na-MNT) is investigated by performing in-situ X-ray diffraction (XRPD) on fresh, unaltered clay pastes. The use of this technique reveals the real influence of the PCE structure and of the PCE/clay dosage ratio on the expansion profile of the clay. This is not observed with the traditional XRPD methodology performed on dried clay pastes, which shows the same values of d-spacing despite using polymers of diverse structures. It is observed that PCE polymers with long side chains and high side chain density result in larger expansion. Additionally, polymers with a high anionic charge saturate the interlaminar space of montmorillonite at a lower dosage. The experimental results also indicate that clay exfoliation is critical in the intercalation process and the exfoliation tendency of the clay is influenced by the structure of PCE polymers.
Influence of the polymer structure of polycarboxylate-based superplasticizers on the intercalation behaviour in montmorillonite clays
Borralleras, Pere (Autor:in) / Segura, Ignacio (Autor:in) / Aranda, Miguel A.G. (Autor:in) / Aguado, Antonio (Autor:in)
Construction and Building Materials ; 220 ; 285-296
03.06.2019
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2012