【摘要】 采用热释电流 (TSDC)技术 ,结合差热分析和X射线衍射方法 ,对由共聚物VDF(5 6) /TrFE(4 4)和VDF(77) /TrFE(2 3 )共混形成的不同摩尔比的VDF/TrFE共混物进行了研究 .发现共混物显示二个居里转变温度 ,其结晶区域由二个共聚物组分的晶区构成 ,体现出共混物中二共聚物组分的晶区是不相容的 .不同极化温度的热处理共混物的TSDC结果还证明 ,空间电荷对剩余极化有一定的稳定作用 .更多还原

【Abstract】 Ferroelectric blends of vinylidene fluoride(VDF)/trifluoroethylene(TrFE) copolymer with different molar ratio of 56/44, 60/40, 63/37, 67/33, 70/30, 73/27 and 77/23 were fabricated by casting from methyl ethyl ketone solution. Wide angle X ray diffraction shows two peaks (17.6 o and 19.5 o) for all blends and copolymers, associating with amorphous region and (110) (200) reflections, respectively. It indicates that blending does not introduce any new crystal lattice. Analysis of differential scanning calorimetry (DSC) presents that the blends display the phase transition characters of both copolymers of 77/23 and 56/44. The blend components are immiscible in the crystalline phase. Thermally stimulated depolarization current of the blends exhibits the characters of both components at different polarization temperatures. In accordance with DSC results, it also proves that the crystalline phases of 56/44 and 77/23 are just independent. In addition, it is also proved that the space charge can stabilize the remnant polarization to some extent.更多还原