Core/Shell Pigments with Polyaniline Shell: Optical and Physical–Technical Propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 13 июля 2022 г.
Аннотация:Core/shell pigments allow for the combination of the active anti-corrosion effect of theshell and the barrier effect of the core. This makes it possible to obtain anti-corrosion pigments, witha high—protective effect and low toxicity. Thus, the need for a comprehensive study of theproperties of these pigments grows more urgent, before their application to paints and varnishes.The hiding power of core/shell pigments comes close to the one of pure polyaniline (PANi), whenthe PANi content in the pigment reaches 50 wt.%, with sulfuric and phosphoric acids used asdopants. This paper, also, shows that the blackness value of core/shell pigments with 10 wt.% PANiis around 35 and constant; for pure PANi, their blackness value is 40. When PANi content is 5 wt.%,kaolin-based pigment shows the lowest blackness, which happens due to a generally higherwhiteness of kaolin. However, when the PANi content surpasses 10 wt.%, there seems to be noinfluence on the blackness of the core/shell pigments. The core/shell pigment with a 20 wt.% PANiis, optically, identical to a black-iron-oxide pigment. An increase in the PANi content of thecore/shell pigment leads to an increase in the oil absorption of the samples. It was found that thedispersion process would be the most energy efficient for core/shell pigments, containing kaolinand talc as a core.