Newly designed diblock dispersant for powder stabilization in water-based suspensions
| Autor: | Shinn-Jen Chang, Ruo-Han Yu, Chi-Wei Wu, Chia-Chen Li, Cha-Wen Chang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Acrylate
Materials science Dispersity 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Methacrylate 01 natural sciences Dispersant 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Rheology Chemical engineering chemistry Organic chemistry DLVO theory 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Journal of colloid and interface science. 506 |
| ISSN: | 1095-7103 |
| Popis: | A newly designed dispersant for water-based suspensions, ammonium poly(methacrylate)-block-poly(2-phenoxyethyl acrylate) (PMA-b-PBEA), is proposed in this study. According to the results of rheological analysis, the dispersion efficiency of this new dispersant is superior to that of the commercially available ammonium polyacrylate (PAA-NH4). The diblock structure of PMA-b-PBEA, which simultaneously contains a low-polar anchoring head group and a water-dissociable stabilizing moiety, is the main cause for its extremely high efficiency for powder dispersion. The unique structure not only results in effective adsorption approximately double that of PAA-NH4, but also produces a low number of counter-ions that compress the electrical double layer and ruin powder stabilization. Based on Derjaquin-Landau-Verwey-Overbeek calculations, the large adsorbance of PMA-b-PBEA gives the powder, titania (TiO2) in this study, a high steric stabilization energy. In addition, PMA-b-PBEA provides TiO2 with a remarkably high electrostatic energy because it generates fewer counter-ions. This energy provides excellent dispersity of powder in the suspensions with a high solid content of 60wt% without showing any rheological hysteresis. |
| Databáze: | OpenAIRE |
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