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- Title
Effect of high‐temperature annealing on the microstructure and mechanical properties of polypropylene with shish kebab or spherulite structure.
- Authors
Mi, Dashan; Zhou, Man; Hou, Fengyi; Zhang, Jie
- Abstract
ABSTRACT: Various annealing temperatures below, near, or above the melting temperature were used to anneal polypropylene with oriented shish kebab and isolated spherulite structures in this work. The results showed that a high annealing temperature decreases the time needed to achieve the ideal material property. When the annealing temperature is near or above the melting temperature, the impact strength would be 1.6 times improved by partial melting and recrystallization. The crystal structure of the oriented shish kebab or isolated spherulite structures was improved when annealed at 150 °C, whereas annealing at 165 or 170 °C recombined the crystal lamellae of the structure. Moreover, the high crystallinity and thick lamellae improved the impact and yield strength values of the spherulite structure. However, excessively high crystallinity and thick lamellae in the oriented shish kebab structure did not result in good mechanical performance. Therefore, the prediction of mechanical properties for the shish kebab structure based on crystallinity and lamellar thickness is not feasible. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2018</bold>, <italic>135</italic>, 46465.
- Subjects
POLYPROPYLENE; MECHANICAL behavior of materials; SPHERULITES (Polymers); MICROSTRUCTURE; CRYSTAL structure
- Publication
Journal of Applied Polymer Science, 2018, Vol 135, Issue 30, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.46465