Abstract
The pyroelectric behaviour of PVP-PVA polyblend films of different weight ratios, grown by the isothermal immersion technique has been studied under different polarizing fields and temperatures in a vacuum of 10 −3 Torr. The pyroelectric coefficient g 3 is evaluated from the measured pyroelectric current. The pyroelectric behaviour of the blend showed a systematic variation with the ratio of the constituents, i.e. the pyroelectric coefficient was found to increase with increasing percentage of PVP in the blend suggesting good miscibility of the individual polymers in the blend. The effect of electrode materials of different work functions on the pyroelectricity was also studied. The observed pyroelectricity in the polymer blend films was considered to be due to both dipolar orientation and space charge polarization. Compared to other blend compositions, polymer blend I (PVP: PVA = 75:25) was suggested as the best electret having better pyroelectric properties.
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