Abstract
Organic coatings often contain sufficient pigmentation that the pigment volume concentration (PVC) and the critical PVC (CPVC) must be carefully considered. Past work has shown that the CPVC can be identified with the random densest packing of pigment particles after considerations of the adsorbed polymer layer on the particles is taken into account, and that this packing can be predicted by empirical particle packing algorithms developed for mixtures of particle sizes. Recent studies have shown that local fluctuations of pigment and polymer concentrations in a film can lead to local film volumes that can exceed the CPVC even though the average PVC for the whole film (the global PVC) is below the CPVC. These effects are consistent with observations of void formation in films below the CPVC, and can be analyzed by local film statistics. We have also recently performed simulations of particle packing by the compression of multiple hard spheres that allows further insight into local concentration fluctuations in PVC within a film.
| Original language | English |
|---|---|
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | Progress in Organic Coatings |
| Volume | 35 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - Aug 1 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1998 24th International Conference in Organic Coatings: Waterborne, High Solids and Powder Coatings - Vouliagmeni, Greece Duration: Jul 6 1998 → Jul 10 1998 |