No abstract

It was previously reported acetaldehyde-induced crystallization of PET film wherein the original unoriented film is dipped in acetaldehyde for 5 min to drastically enhance its crystallinity. It was conducted additional experiments and evaluated this crystallinity by infrared, X-ray analyses. We report here a type of TX (a so-called middle crystal status) that does not lead to complete thermal shrinkage proof. By the acetaldehyde-induced process, CH2-wagging at 1340cm-1 is activated. However, the degree that a carbonyl group and a benzene ring are packed on the same plane by this solvent processing is reduced. These results are related to the improvement of heat resistance after stretching at 80°C and the highly extensional characteristics at 20°C of this stretched film after placing in boiling water.

In this work, we developed a synthetic method for preparing one-dimensional MnO2 nanowires through a hydrothermal method using a mixture of KMnO4 and MnSO4 precursors. As-prepared MnO2 nanowires had a high surface area and porous structure, which are beneficial to the fast electron and ion transfer during electrochemical reaction. The microstructure and chemical structure of MnO2 nanowires were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller measurements. The electrochemical properties of MnO2 nanowire electrodes were also investigated using cyclic voltammetry and galvanostatic charge-discharge with a three-electrode system. MnO2 nanowire electrodes showed a high specific capacitance of 129 F/g, a high rate capability of 61% retention, and an excellent cycle life of 100% during 1000 cycles.