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| Hauptseite > Publikationsdatenbank > Self-, co-organisation behaviour and encapsulation efficiency of waterborne polyurethane pre–polymers |
| Hauptseite > Publikationsdatenbank > Self-, co-organisation behaviour and encapsulation efficiency of waterborne polyurethane pre–polymers |
| Journal Article | FZJ-2018-01200 |
; ; ; ;
2018
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.colsurfa.2018.01.052
Abstract: Polyurethane-prepolymers are the precursor for waterborne polyurethane coating applications. The physical–chemical behavior of the pre-polymers are worth thorough investigation, since they will largely influence the final properties of coating products [1–3]. In this paper, we experimentally studied the self-, co-organization characteristics and encapsulation efficiency of a polyurethane pre-polymer in aqueous electrolyte environment, by means of light scattering and small angle X-ray scattering. Due to the amphiphilic nature, pre-polymers are expected to form micelles in water. Systematic studies were conducted on dispersions at different pre-polymer concentrations and salt concentrations. Our experiments show that the micelles have a radius of about 10 nm and are stable over a broad range of salt concentrations; only at high salt, 100 mM NaCl, we observe the onset of colloidal instability. Moreover, we find that the amphiphilic pre-polymers are able to encapsulate hydrophobic counterparts, forming particles with radii of about 130 nm. The threshold ratio of hydrophilic over hydrophobic pre-polymers to form stable dispersion is found to be 5:1.
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