Thermal and Mechanical Characterization of Aniline-Formaldehyde Copolymer

摘要

Copolymer of aniline and formaldehyde has been synthesized by chemical oxidative polymerization using FeCl3 as an oxidant in aqueous acidic medium. Thermal transport properties like effective thermal conductivity (e), effective thermal diffusivity (e) and dynamic mechanical properties such as modulus (E), loss tangent (tan) together with their temperature dependence have been investigated by transient plane source (TPS) method and dynamic mechanical analyzer (DMA) respectively. It has been found that both e and e increase with increase in temperature initially from room temperature to 80 °C and then decrease in the temperature range from 80 to 110 °C. For further increase in temperature e & e increase slightly and then attains a saturation value. The variation of modulus and loss tangent shows similar response and indicates a phase transformation at about 115 °C. This behavior of thermal transport properties is explained in terms of variation in mean free path of phonons arising due to structural changes in the material. Differential scanning calorimetry (DSC) was also performed to confirm the above said phase transformation. The results on phase transformation are in good agreement both by TPS and DMA.