Relationship between Morphology and Deformation Mechanisms of Polyolefins
- 1 January 1964
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 35 (1), 47-54
- https://doi.org/10.1063/1.1713097
Abstract
The birefringence of polyolefins undergoes a change from an initial negative value at low elongation to a positive value at higher elongations. The extent of the negative contribution depends upon time after quenching the sample and upon temperature. The changes result from a change in the mode of crystal orientation. A model involving spherulite deformation and reorientation of crystals within the spherulite is proposed. Changes with time and temperature are ascribed to changes in a parameter γ describing the mobility of crystals within the spherulites. The model is also used to account for variation in the dynamic birefringence with straining frequency.Keywords
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