Abstract
Juglone is a naphthoquinone-type dye. It is also known as a C.I Natural Brown 7 dye and is used to dye natural and synthetic fibers. This article presents the possibility of using juglone as a natural colorant for biodegradable polymers (polylactide and polyhydroxybutyrate). Based on the results of the research, it was shown that juglone added to biodegradable aliphatic polyesters does not change the properties of the polymers, such as mechanical properties and thermal stability. Noteworthy is the change in the color of the materials under the influence of various external factors, such as temperature, humidity, and UV radiation. Juglone can be used as an indicator of the aging time of polymeric materials. The presented materials, made of biodegradable polymers with a dye of plant origins, may potentially be applied to packaging materials with controllable life-times. The scientific novelty of this paper is the use of juglone as a natural dye and as an indicator of the aging time of biodegradable polyesters (polylactide and polyhydroxybutyrate).
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