Polycarbonate dielectric permittivity

The electrical properties, i.e, volume resistivity, dielectric permittivity and dielectric loss factor, as well as thermally stimulated depolarization current, were measured on polypropylene-polycarbonate (PP-PC) blends. The results confirm the existence of some interactions between the non--compatible components of PP-PC blends. 

Figure 6.19. Dielectric permittivity spectra (Re ,(v)) of polycarbonate (Goodfellow, UK), in vacuum and for sorption equilibria of supercritical COj at...

Figure 6.30. Gibbs excess mass of (CH4, 5.5) sorbed in polycarbonate (GoodfeUow, UK) at T = 308 K for gas pressures up to 4 MPa and static dielectric permittivity (e,) of the (methane loaded) polymer [5.2,6.3].

Poetschke P, Dudkin S M and Alig I (2003) Dielectric spectroscopy on melt processed polycarbonate-multiwalled carbon nanotube composites, Polymer 44 5023-5030. Kramarenko V Y, Shantalii T A, Karpova I L, Dragan K S, Privalko E G, Privalko V P, Pragiadakis D and Pissis P (2004) Polyimides reinforced with the sol-gel derived organosilicon nanophase as low dielectric permittivity materials, Polym Adv Technol 15 144-148. 

Dielectric spectroscopy is concerned with the dependence of complex permittivity on temperature and frequency. The relatively low level of d.c. conduction in polycarbonate ensures that the principal relaxations associated with polycarbonate s active C 0 dipole can be observed over a useful range of frequency and temperature. In multi-phase or multi-component polymers charge accumulation at the sub-structure interfaces leads to Maxwell-Wagner-Sillars (MWS) contributions to the overall polarization. 

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