Abstract
An apparatus for the simultaneous observation of dynamic birefringence and dynamic modulus has been developed to pursue the responses of internal structures of semicrystalline polymers, i.e., the orientation processes of some structural units, in response to mechanical stimulation. This apparatus is similar in principle to the dynamic X-ray diffraction device developed in the same laboratory, but the construction is partially modified. The π-sector technique is used in the measurement and its principles and application to dynamic birefringence are presented. The major problems lowering the precision of the measurement, which arose mainly from the fluctuations of the signals and drift of the amplifiers, have been overcome by amplifying the net amplitude of the dynamic signals and averaging the signals, thus achieving high accuracy. A good correlation between the mechanical and birefringence dispersions for a low-density polyethylene is observed and these results are discussed briefly.
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Kyu, T., Yasuda, N., Tabushi, M. et al. Dynamic Birefringence Behavior of Semicrystalline Polymers. I. Principles and Experimental Procedure of the π-Sector Technique. Polym J 7, 108–122 (1975). https://doi.org/10.1295/polymj.7.108
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DOI: https://doi.org/10.1295/polymj.7.108