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Poly(oxymethylene)s with different molecular mass and chemical structure were studied using DSC, dynamic mechanical relaxation, thermomechanical analysis, and thermogravimetry.Molecular mobilities of two types were found in the amorphous phase of poly-(oxymethylene). Unconstrained chains of poly(oxymethylene) soften at -70~ and then amorphous chains with different restraints from the crystalline phase are successively activated in a wide temperature interval.

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