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Flow‐induced crystallization of polypropylene in stretched ribbons
Author(s) -
Andersen P. G.,
Carr S. H.
Publication year - 1976
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760160316
Subject(s) - materials science , crystallization , polypropylene , composite material , drop (telecommunication) , diffraction , flow (mathematics) , ultimate tensile strength , yield (engineering) , crystal (programming language) , crystallography , mechanics , thermodynamics , optics , telecommunications , chemistry , physics , computer science , programming language
Ribbons of molten polypropylene have been extruded into a thermostatted chamber and subjected to elongations ranging as high as 4400‐fold. Some of these ribbons have been shown to possess the unusual ability of recovering nearly all of the strain from large levels of stretch (≤100 percent). This property, as well as the magnitude of the tensile yield drop, has been found to be directly proportional to the uniaxial character of the flow present at the moment of crystallization. The structure in the final solid films has been characterized by wide angle X‐ray diffraction and crystal orientation distribution. Both of these factors have been found to be proportional to the character of flow at the moment of crystallization. Finally, the temperature in the thermostatted chamber has been shown to affect the character of the flow.