TRANSIENT CURRENTS IN POLY(VINYL ALCOHOL) POLY(VINYL PYRROLIDONE) POLYMER BLEND FILMS

被引：8
|
作者：
NARAYANA, KL [1 ]
DASARADHUDU, Y [1 ]
RAO, VVRN [1 ]
机构：
[1] SRI VENKATESWARA UNIV,DEPT PHYS,TIRUPATI 517502,ANDHRA PRADESH,INDIA
来源：
POLYMER INTERNATIONAL | 1994年 / 35卷 / 04期
关键词：
TRANSIENT CURRENTS; POLYMER BLEND FILMS; QUASI-STEADY-STATE CURRENTS; ISOCHRONAL CURRENTS; ACTIVATION ENERGIES; DIPOLAR PROCESS; SPACE CHARGE;
D O I：
10.1002/pi.1994.210350403
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Transient currents (charging and discharging currents) in poly(vinyl alcohol) (PVA)-poly(vinyl pyrrolidone) (PVP) polymer blend films were measured over the temperature range 30-150-degrees-C at field strengths of 2.32-23.2 x 10(6) Vm-1. Polymer films were prepared by the isothermal immersion technique. Activation energies were evaluated from quasi-steady-state currents. A single relaxation peak was observed both from isochronal currents and low frequency dielectric relaxation. Activation energies evaluated from these two methods are found to be in fairly good agreement. The polarization is considered to be due to space charge origin along with some contribution from dipolar groups. The maximum loss was observed in Sample I (PVA: PVP = 25: 75), suggesting maximum heterogeneity in this blend ratio.
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页码：315 / 320
页数：6
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