MECHANICAL AND DIELECTRIC-PROPERTIES OF BULKY SIDE-CHAIN POLY(METHACRYLATES) - ANALYSIS OF THE LOW-FREQUENCY PHENOMENA .1. POLY(5-INDANYL METHACRYLATE)

This paper composes the dynamic mechanical and dielectric relaxation p roperties for Poly (5-indanyl methacrylate) (P51M), a polymer with a b ulky side chain. Measurements were carried out from about -100 degrees C to near 250 degrees C. A secondary loss peak was observed in dielec tric measurements at room temperature (20 degrees C at 0.1 Hz.), where as nothing was resolved in the mechanical spectrum, A prominent alpha relaxation associated with the glass transition was also observed near 107 degrees C at 0.1 Hz. in the dielectric and the mechanical spectra . Dipolar dielectric loss overlapped with conductivity at high tempera tures and low frequencies. A new method to split the conductive, inter facial, and dipolar contributions to the spectrum is proposed.