Effects of polypyrrole on the characteristics of polyurethane based composites

In this study, the polyurethane based composites were prepared by solvent casting from dimethylformamid (DMF) solutions of Polyurethane-Polypyrrole (PU-PPy) in order to obtain the polyurethane based composites with enhanced dielectric properties for smart textile applications. From this research, it can be concluded that Glass Transition Temperature (Tg) values of the composites were influenced by the number of hydrogen bonds formed inside polyurethane in the presence of PPy. When the initial amount of pyrrole was increased, the Tg values of the composites were seen to increase. A correlation of the glass transition temperatures of the samples, determined by Differential Scanning Calorimeter (DSC) and Dynamic Mechanical Analyzer (DMA) via Young's modulus, showed that the increase of PPy reduced mobility and increased the glass transition temperature and modulus. Dielectric study results indicated that ~20% wt. Pyrrole (Py) increases dielectric constant above 7000 and these composites can be good candidates for electrical application.