Direct spectroscopic evidence of field-induced solid-state chain conformation transformation in a ferroelectric relaxor polymer
Direct spectroscopic evidence of field-induced solid-state chain conformation transformation in a ferroelectric relaxor polymer
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DOI：
10.1063/1.2169659
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发表时间：
2006-02
影响因子：
3.2
通讯作者：
Shihai Zhang;Baojin Chu;B. Neese;K. Ren;Xin Zhou;Qiming Zhang
中科院分区：
文献类型：
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作者：
Shihai Zhang;Baojin Chu;B. Neese;K. Ren;Xin Zhou;Qiming Zhang
铁电弛豫体P（VDF-TrFE-CFE）P_2O_3在100 MV scinm的电场下可以产生47 mC scinm ~ 2的无掺杂极化，并且对于许多潜在的致动和传感应用是有吸引力的。电场作用下的傅里叶变换红外光谱表明，这种大的极化源于场致晶相转变。P（VDF-TrFE-CFE）中的非极性TGTG′链构象在强电场作用下可转变为极性反式（Tm>4和T3 G）构象，且后者可有效地沿电场方向排列.此外，这种构象转变是完全可逆的，并且在外加电场的切换过程中没有观察到滞后。相比之下，正常的铁电聚合物P（VDF-TrFE）具有非常小的可逆极化的方形极化回路。
Ferroelectric relaxor P(VDF-TrFE-CFE) terpolymer can generate a hysteresis-free polarization of 47mC∕m2 at an electric field of 100MV∕m and is attractive for many potential actuating and sensing applications. Fourier transform infrared spectra under electric field reveal that this large polarization originates from the field-induced crystalline phase transformation. The nonpolar TGTG′ chain conformation in P(VDF-TrFE-CFE) can be converted into polar trans (Tm>4 and T3G) conformation under high electric field and the latter can be effectively aligned to the applied field direction. Furthermore, this conformation transformation is completely reversible and no hysteresis can be observed during the switching of applied electric field. In contrast, normal ferroelectric polymer P(VDF-TrFE) exhibits square polarization loop with very small reversible polarization.