The paper deals with the study of seven selected natural plant oils. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermally stimulated discharge (TSD) methods were used. It has been found that most of the oils tested are in a glassy state at low temperature and have multiple transitions in the low temperature range. DSC shows complex melting-like processes or glass transition. For both DMA and TSD, the scaffold supportive method was used and found as a suitable one. DMA and TSD proved more sensitive than DSC and revealed at least two transitions between − 120 and − 40 °C. In the case of three oils (argan, avocado and sunflower), current reversal was observed by TSD; this symptom cannot be fully explained at the moment.

The shortage of oil and related minerals and also their extreme environmental drawbacks are the main reason for the quick-growing interest in biodegradable polymer composites production. Biodegradable polymer composites are mainly produced from renewable resources which are biologically degradable. In this research, corn starch was plasticized with glycerol. The plasticized thermoplastic corn starch was reinforced with calcium carbonate precipitate powder as a filler and pine wood fibre as reinforcement. Free thermoplastic plasticized corn starch (FTPS), thermoplastic corn starch reinforced with calcium carbonate (CTPS), thermoplastic corn starch reinforced with pine wood (WTPS), thermoplastic corn starch reinforced with pine wood fibre and calcium carbonate precipitate hybrid composite (HTPS) were produced and compared for their mechanical properties like tensile strength and, hardness. DSC and DMA analysis were also done for determining their thermal properties. Moreover, the water absorption test was also carried out to understand their resistance to moisture. WTPS exhibits better results in most of the measured proprieties given that TPS and wood fibre being both hydrophobic resulted in a homogeneous distribution and better interfacial adhesion.

A lágyítók csoportjába azok az anyagok tartoznak, amelyeket a keménység csökkentése, a nyújthatóság és a feldolgozhatóság javítása érdekében adagolnak a műanyagokhoz. A lágyító hatású anyagokra az a jellemző, hogy csökkentik a polimerek megömlési hőmérsékletét, rugalmassági modulusát és ridegségi hőmérsékletét, de nem változtatják meg a makromolekulák kémiai természetét. A fenntarthatóság jegyében és a műanyagokkal szemben táplált társadalmi ellenérzések enyhítése érdekében napjainkban egyre több figyelmet kapnak az ún. természetes eredetű lágyítószerek fejlesztése, alkalmazhatóságuk vizsgálata. Ezért munkánk során repceolaj alapú gumiipari lágyítószert vizsgáltunk különböző vizsgálati módszerekkel.

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