中文摘要：

通过压电系数d33在不同温度下的等温衰减测量，研究了经化学改性和压力膨化处理的孔洞聚丙烯驻极体膜的压电热稳定性，结果表明化学改性极大地提高了其压电热稳定性。对其热刺激放电（TSD）电流及电荷等温衰减的研究结果表明，化学改性膜的压电热稳定性的显著提高主要归因于孔洞电荷热稳定性的改善。

英文摘要：

The thermal stability of piezoelectricity for the chemically modified and pressure expanded cellular polypropylene films were studied by measuring the isothermal decay of piezoelectric d33-coefficient under different temperatures. The results indicated that chemical modification could significantly improve the thermal stability of piezoelectricity for the cellular PP films. As indicated by the results of the open-circuit thermally stimulated discharge （TSD） and charge isothermal decay, the improvement of the thermal stability of piezoelectricity for the chemically modified cellular PP films mainly attributed to the enhancement of the thermal stability of the charges in bubbles.