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Ultrasonic investigations of morphology and stress relaxation in drawn polypropylene

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Volume
22
Issue
8
Identifiers
DOI: 10.1016/0032-3861(81)90286-x

Abstract

Abstract The effects of annealing on ultrasound propagation in drawn samples of polypropylene are reported. Below 373K the attenuation is dominated by scattering associated with voids generated during the drawing process. Above 383K the void content changes significantly with an associated decrease in the ultrasonic attenuation. Shrinkage, changes in optical clarity and changes in density of the drawn samples are discussed in terms of possible modification of the polymer structure.

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