Abstract
Semi-crystalline as well as amorphous polymers generally develop some measure of molecular mobility at temperatures well below their melting temperature, T m , or their glass transition temperature, T g . In these polymers, one or more damping or internal friction peaks are usually found to occur in the low temperature region from 4K to 300K. The magnitude and temperature position of these maxima are dependent upon the structure of the polymer, its mode of preparation and past history, and the local environment of the moving units. Various examples are given of polymers that show significant low temperature relaxation processes, and the influence of chemical structure, structural substitution, crystallinity and low molecular weight diluents is illustrated. The extent to which relaxation behaviour can be correlated to macroscopic ductility and fracture toughness is also discussed.
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