Impact of Molecular Structure on Zeta Potential and Adsorbed Conformation of .ALPHA.-Allyl-.OMEGA.-Methoxypolyethylene Glycol-Maleic Anhydride Superplasticizers
Source abstract
Abstract
α-Allyl-ω-methoxypolyethylene glycol - maleic anhydride copolymers were synthesized with side chain lengths nEO from 0-130 and characterized by aqueous GPC. A representation of their molecular conformation (e.g. worm-, brush- or star-like polymers) was developed. The amount of polymer adsorbed on cement rapidly decreases with increasing side chain length nEO. Zeta potential measurements using the electroacoustic method in cement paste with w/c = 0.5 indicate that worm-like copolymers with nEO ≤ 7 adsorb flat (“train” type) and form a densely packed, thin polymer film. In this case, the adsorbed amount of copolymer is high. For star polymers with nEO ≥ 34, preferred orientation of the polymer main chain is perpendicular to the cement surface (“tail” type). The result is a thick polymer layer, with a second electrochemical double layer on top. For star polymers, the adsorbed amount is low because of the higher surface occupancy of horizontally layered side groups.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Polymer Nanocomposites and Properties · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (15)
Show source-provided references
1. 1994 · 16 · 45
2. Biesalski, M. and Rühe, J. (2002). “Polyelectrolytes at Solid Surfaces: Multilayers and Brushes.” Handbook of Polymers and their applications. 39-63.
3. 10.1016/j.colsurfa.2005.03.00810.1016/j.colsurfa.2005.03.008 ↗
4. Brandrup, J. and Immergut, E. (1989). Polymer Handbook. 3rd ed., Wiley-Interscience, (1) 268.
5. Dukhin, A. S. and Goetz, P. J. (2002). Ultrasound for Characterizing Colloids. Elsevier, 206-207.
6. Gay, C. and Raphaël, E. (2001). “Comb-like polymers inside nanoscale pores.” Adv. Colloid Sci., 94 (1-3), 229-236.10.1016/S0001-8686(01)00062-8 ↗
7. 10.1126/science.261.5118.23110.1126/science.261.5118.231 ↗
8. 10.1016/j.cemconres.2004.04.03110.1016/j.cemconres.2004.04.031 ↗
9. Odian, G. (1991). Principles of Polymerization. 3rd ed., Wiley-Interscience, 23, 489.
10. Ohta, A., Sugiyama, T. and Uomoto, T. (2000). “Study of dispersing effects of polycarboxylate-based dispersants on fine particles.” Sixth CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete, American Concrete Institute, SP-195, 211-227.
11. Plank, J., Vlad, D., Brandl, A. and Chatziagorastou, P. (2005). “Colloidal chemistry examination of the steric effect of polycarboxylate superplasticizers.” Cement International, 3(2), 100-110.
12. Ramachandran, V. S., Malhotra, V. M., Jolicoeur, C. and Spiratos, N. (1998). “Superplasticizers: properties and applications in concrete.” CANMET Publication MTL, Ottawa, (TR) 97-14.
13. 10.3151/jact.1.1610.3151/jact.1.16 ↗
14. Sakai, E., Atarashi, D., Kawakami, A. and Daimon, M. (2003). “Influence of molecular structure of comb-type superplasticizers and inorganic electrolytes on the dispersion mechanisms of limestone powder.” Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete, American Concrete Institute, SP-217, 381-392.
15. Uchikawa, H. (1995). “Hydratation of cement and structure formation and properties of cement paste in the presence of organic admixture.” J. Res. Chichibu Onada Cem.Corp., 46 (1), 3-47.