| Summary: | This research endeavor aimed to develop thin film blends of polypyrrole (PPy) and poly (styrene-isoprene-styrene) (SIS) with MoO<sub>3</sub> as a nanofiller for improved mechanical and electrical properties to widen its scope in the field of mechatronics. This study reports blends of polypyrrole (PPy) and poly (styrene-isoprene-styrene) (SIS) tri-block copolymer showing improved mechanical and electrical attributes while employing MoO<sub>3</sub> nanobelts as nanofillers that additionally improves the abovementioned properties in the ensuing nanocomposites. The synthesis of PPy/SIS blends and MoO<sub>3</sub>/PPy/SIS nanocomposites was well corroborated with XRD, SEM, FTIR, and EDS analysis. Successful blending of PPy was yielded up to 15 <i>w</i>/<i>w</i>% PPy in SIS, as beyond this self-agglomeration of PPy was observed. The results showed a remarkable increase in the conductivity of insulating SIS copolymer from 1.5 × 10<sup>−6.1</sup> to 0.343 Scm<sup>−1</sup> and tensile strength up to 8.5 MPa with the 15 <i>w</i>/<i>w</i>% PPy/SIS blend. A further enhancement of the properties was recorded by embedding MoO<sub>3</sub> nanobelts with varying concentrations of the nanofillers into 15 <i>w</i>/<i>w</i>% PPy/SIS blends. The mechanical strength of the polymeric nanocomposites was enhanced up to 11.4 MPa with an increase in conductivity up to 1.51 Scm<sup>−1</sup> for 3 <i>w</i>/<i>w</i>% MoO<sub>3</sub>/PPy-SIS blends. The resultant product exhibited good potential for electro-mechanical dual applications.
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