Effect of crystallization conditions on the morphological structure of ethylene-1-butene copolymers obtained by different ziegler-natta catalyst systems
✍ Scribed by E. Pérez; R. Benavente; A. Bello; J. M. Pereña; C. Aguilar; M. C. Martínez
- Publisher
- Society for Plastic Engineers
- Year
- 1991
- Tongue
- English
- Weight
- 501 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0032-3888
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✦ Synopsis
Abstract
Four ethylene‐ 1 ‐butene copolymers of about the same comonomer content but obtained with different supported Ziegler‐Natta catalyst systems have been studied. The effects of the catalyst and the crystallization conditions on the morphological structure have been analyzed. These two factors'clearly affect the melting endotherms and the most probable crystallite thickness of the copolymers, although no important differences were found in the crystalline contents. The catalyst system influences the melting pattern due to changes in the chemical composition distribution, i.e., variations in the comonomer content between chains of different molecular weight.