聚偏氟乙烯在动载荷作用下压电特性的研究

STUDIES OF PIEZOELECTRIC BEHAVIOURS FOR PVF_2 UNDER DYNAMIC LOADINGS

本文利用爆炸激波管研究了聚偏氟乙烯(PVF_2)在0.01至4 MPa 的冲击波作用下的压电特性。实验发现,大约在0.25 MPa附近,压电灵敏度出现急剧下降,然后很快趋于稳定。本文还利用X射线衍射仪观察了冲击载荷下 PVF_2的晶型变化,X射线衍射结果表明,PVF_2在 3～4MPa的冲击波几十次反复作用下晶型不发生明显改变。

The piezoelectric behaviours of PVF2 (polyvinylidene fluoride) under dynamic loadings (0.01-4 MPa) are studied dy means of explosion shock tube. It is found in the experiments that the piezoelectric sensitivity abruptly decreases for the loading pressures larger than 0.25 MPa, and approaches a constant The crystalline fea-turer of PVF2 under dynamic loadings were observed with a X-ray diffractometer.The results show that it is not obviously changed even undergoing shock loadings of (3 - 4 ) MPa for many times.