Regular undulation and polarization modulation on the film surface of a planarly aligned SmC* polymer
Regular undulation and polarization modulation on the film surface of a planarly aligned SmC* polymer
复制标题
平面排列的 SmC* 聚合物薄膜表面的规则起伏和偏振调制
DOI：
10.1039/c0sm00668h
复制
发表时间：
2011
期刊：
影响因子：
3.4
通讯作者：
& Watanabe J.
中科院分区：
文献类型：
--
作者：
Zhang C.;Ishige R.;Yasumatsu R.;Kang S.;Tokita M.;& Watanabe J.
主链型聚合物中的手性近晶C(SMC*)在其玻璃膜表面呈现起伏，这些起伏是由符合SMC*螺旋场的聚合物螺旋组装产生的。在这项研究中，我们从开尔文力显微镜(KFM)和原子力显微镜(AFM)图像的组合观察中发现了叠加在起伏上的偏振调制。这种调制是由每个近晶层的自发极化引起的；它的方向与层平行，垂直于层内分子的倾斜方向，并绕螺旋轴旋转。偏振调制长度完全对应于SMC的起伏长度，即螺旋节距。通过阐明自发极化相对于介元倾斜方向的相对方向，我们描述了聚合物是如何被调节以产生这种规则的起伏和极化调制的。
Chiral smectic C (SmC*) in a main-chain type of polymer exhibits undulations on its glassy film surface; these undulations are produced by the helical assembly of polymer conforming to the helical field of SmC*. In this study, we have found a polarization modulation superimposed on the undulation from the combined observations of Kelvin force microscopy (KFM) and atomic force microscopy (AFM) images. This modulation is caused by the spontaneous polarization of each smectic layer; its direction is parallel to the layer and perpendicular to the tilt direction of molecules within a layer, and rotates around the helical axis. The polarization modulation length corresponds perfectly to the undulation length, i.e., helical pitch of SmC*. By clarifying the relative direction of the spontaneous polarization to the tilt direction of mesogens, we described how the polymers are accommodated to produce such a regular undulation and polarization modulation.