Relaxational properties of epoxy materials modified by rubber seed oil derivatives

Vegetable oils are of great interest as modifiers of epoxy polymers, as renewable raw materials characterized by biodegradability and having a positive impact on their performance. Among them stands out the rubber seed oil, which is a by-product obtained from the fruits of Hevea brasiliensis. To more fully assessment of the modifying action character in epoxy compositions of rubber seed oil and its functionalized derivatives with epoxy and cyclocarbonate groups, their relaxational properties were investigated by the dynamic mechanical analysis. It is established that no additional maxima are observed when modifiers are introduced. At the same time, there is some change in the height, width and temperature position of the observed relaxation processes. It is shown that all the studied modifies shift the transition from a glassy state to a highly elastic one in the region of lower temperatures and affect both the height of the maximum mechanical losses and the loss modulus value. Higher modulus values are detected for epoxy polymers modified with epoxidized rubber seed oil, indicating greater efficiency of intermolecular interactions of the components in this composition. The cyclocarbonate of epoxidized rubber seed oil has the greatest plasticizing effect. Thermomechanical method confirmed the plasticizing effect of the studied modifying additives

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