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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 lifetimes. 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).

Abstract. Polymers are common used in everyday life. For economic reasons and specific properties, they replace traditional materials such as glass, wood or paper. The use of polymeric materials generates waste, whose disposal is difficult. Legislation and pressures on the use of proecological materials have increased interest in biodegradable polymers. Such polymers are polyhydroxyalkanoates. It is also important to use ecofriendly processing additives added to polymeric materials. The most commonly used anti -aging substances are triazine and hindered amine HALS (Hindered Amine Light Stabilizers). Most of these substances are considered to be toxic. Therefore, application of natural compounds in polymers is an interesting alternative. Polyphenols of plant origin are compounds that exhibit high reducing properties in oxidation processes. These compounds should protect polymeric materials against negative influence of environmental factors.