Smart Materials Engineering, Faculty of Textile and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
J Phys Chem B. 2010 Aug 26;114(33):10756-62. doi: 10.1021/jp105239a.
In order to investigate the molecular vibrations and structure variations of PVC gels with applied electric fields, a mechanical measurement (combined tensile and shear test) was proposed, and the Fourier transform infrared (FT-IR) spectrometry and in situ Raman spectroscopy were conducted to clarify the mechanism of electric-field-induced local layer structure in PVC gel and its relationship to gel creeping deformation. As a result, the electric-field-induced local layer structure and the migration of the solvent-rich phase in PVC gels were clarified. The layer of PVC gel clinging to the anode is softer than that near the cathode. The peaks of FT-IR spectra were shifted and changed in the gel surface on the anode and cathode. Using the in situ Raman spectroscopy, it is found that the intensity of the whole Raman spectra was reduced from the cathode to the anode, and the elastic modulus of the gel on the anode was smaller than that on the cathode. All of the results indicated that the electric field induced the local layer structure and caused the asymmetric actuation behavior in PVC gel actuators.
为了研究外加电场下聚氯乙烯（PVC）凝胶的分子振动和结构变化，提出了一种力学测量（结合拉伸和剪切试验）方法，并采用傅里叶变换红外（FT-IR）光谱和原位拉曼光谱来阐明电场诱导的 PVC 凝胶局部层结构及其与凝胶蠕动变形的关系。结果表明，电场诱导了局部层结构和溶剂富相在 PVC 凝胶中的迁移。附着在阳极的 PVC 凝胶层比靠近阴极的层更软。在阳极和阴极的凝胶表面，FT-IR 光谱的峰发生了偏移和变化。通过原位拉曼光谱发现，从阴极到阳极，整个拉曼光谱的强度降低，并且阳极上的凝胶弹性模量小于阴极上的弹性模量。所有结果表明，电场诱导了局部层结构，并导致了 PVC 凝胶致动器的不对称致动行为。
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