Abstract
Dynamic mechanical properties of melt grown Polyoxymethylene are studied for specimens with different lamella thicknesses and for irradiated specimens over a range of temperature from -30°C to 150°C. The apparent relaxation strength of the mechanical α-dispersion is proportional to the lamella thickness. This result qualitatively satisfies the requirements of Okano's theory of crystalline dispersion. The apparent relaxation strength of the α-dispersion for irradiated specimens increases with increasing irradiation dose. This behavior is not due to the growth of lamella thickness with irradiation, but due to other effects, such as the occurrence of lattice defects in crystallites by irradiation. Thus it is impossible to explain this behavior in terms of Okano's theory. The apparent activation energy of the α-dispersion does not change with γ-irradiation, which indication, which indicates that the irradiation does not essentially influence the molecular mechanism of the dispersion.
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