Core/Shell Pigments with Polyaniline Shell: Optical and Physical-Technical Properties

Core/shell pigments allow for the combination of the active anti-corrosion effect of the shell and the barrier effect of the core. This makes it possible to obtain anti-corrosion pigments, with a high-protective effect and low toxicity. Thus, the need for a comprehensive study of the properties of t...

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Bibliographic Details
Published in:Polymers 2022-05, Vol.14 (10), p.2005
Main Authors: Pugacheva, Tatyana A, Malkov, Georgiy V, Ilyin, Alexander A, Indeikin, Eugene A, Kurbatov, Vladimir G
Format: Article
Language:English
Subjects:
19th century
Aniline
Composite materials
Composition
Core making
Corrosion effects
Corrosion prevention
Dyes
Kaolin
Mechanical properties
Microscopy
Optical properties
Paints
Phosphoric acid
Pigments
Polyanilines
Polymerization
Properties
Spectrum analysis
Structure
Toxicity
Varnishes
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Summary:Core/shell pigments allow for the combination of the active anti-corrosion effect of the shell and the barrier effect of the core. This makes it possible to obtain anti-corrosion pigments, with a high-protective effect and low toxicity. Thus, the need for a comprehensive study of the properties 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), when the PANi content in the pigment reaches 50 wt.%, with sulfuric and phosphoric acids used as dopants. This paper, also, shows that the blackness value of core/shell pigments with 10 wt.% PANi is 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 higher whiteness of kaolin. However, when the PANi content surpasses 10 wt.%, there seems to be no influence on the blackness of the core/shell pigments. The core/shell pigment with a 20 wt.% PANi is, optically, identical to a black-iron-oxide pigment. An increase in the PANi content of the core/shell pigment leads to an increase in the oil absorption of the samples. It was found that the dispersion process would be the most energy efficient for core/shell pigments, containing kaolin and talc as a core.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14102005