Abstract
The frequency dispersions of the dynamic birefringence and dynamic mechanical compliance functions of a high-density polyethylene film having a row-nucleated crystalline texture of preferential c-axis orientation along the machine direction were investigated over a frequency range from 0.008 to 4.3 Hz at various temperatures from 20 to 110°C. Two dispersions corresponding to the α1 and α2 processes were observed in the mechanical data. The resolution of these two processes in the frequency dispersion of the loss compliance function was carried out for the MD (machine direction) specimen and TD (transverse direction) specimen, quantitatively. From these resolved loss compliance master curves, the corresponding mechanical retardation time spectra were computed by a deconvolution method. It was found that the α1 retardation time spectra for both specimens appear at approximately the same retardation time range with almost equal peak intensity as well as integrated intensity, whereas the α2 retardation time spectrum of the TD specimen appeared at a longer time range with larger integrated intensity than that of the MD specimen. Subsequently, it is concluded that the α2 process is more conspicuous in the TD specimen than in the MD specimen. In the dynamic birefringence results, only one dispersion, whose activation energy is comparable with that of the α1 mechanical dispersion, was observed in both specimens. The optical retardation time spectra computed also by the deconvolution method from the master curve of the imaginary component of stress-optical coefficient function, were found to be more prominent and to appear at a longer retardation time range for the TD specimen than for the MD specimen. These spectral peak positions on the retardation time scale do not correspond to those of the α1 mechanical spectra in both specimens.
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Kyu, T., Suehiro, S. & Kawai, H. Rheo-Optical Studies on the Deformation Mechanism of Semicrystalline Polymers. XI. Mechanical and Optical Retardation Spectra of a High-Density Polyethylene Having Row-Nucleated Crystalline Texture of c-Axis Orientation. Polym J 12, 251–264 (1980). https://doi.org/10.1295/polymj.12.251
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DOI: https://doi.org/10.1295/polymj.12.251