Polarization absorption currents in poly(vinyledene fluoride) : poly(methyl methacrylate) blend system

Abstract

<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">The blend system of semi-crystalline poly(vinyledene fluoride) (PVDF) with amorphous poly(methylmethacrylate) (PMMA) has been investigated in detail for understanding transient absorption current behaviour. Bilaterally aluminized solvent cast blend samples of various PVDF:PMMA compositions (100:00,90: 10, 80:20,70:30 wt%) were thermally charged with field ranging from 50<i> </i>to 125<i> </i>kV/cm at different temperatures <i>(</i>50<i>-</i>110°C). The observed time, poling temperature, poling field, and wt% blending composition dependence suggest that the transient behaviour is mainly governed by dipolar motion in the bulk samples. Further, in view of the semi-crystalline character of PVDF and the heterogeneous nature of blends, a definite contribution to such currents from charges hopping amongst the localized states, space charges and interfacial effects cannot be ruled out.</span>