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- Title
The effect of mixed and individual silane external donors on the stereo-defect distribution, active sites and properties of polypropylene synthesized with fourth generation Ziegler-Natta catalyst.
- Authors
Hakim, S.; Nekoomanesh, M.; Shahrokhinia, A.
- Abstract
Polypropylene was synthesized with a fourth generation of Ziegler-Natta catalyst and in the presence of mixed and individual external donors, namely cyclohexyl dimethoxymethylsilane and dicyclopenthyl dimethoxysilane. A synergic effect on molecular weight and polydispersity index and changes in crystallinity and crystallization peak temperature with change in molar ratio of donor C to D were observed. The SSA results and related statistical parameters showed that in spite of close average stereo-regularity, the stereodefect distribution differences among the samples obtained with mixed external donors were so vast. The influence of mixed and individual external donors on active site distribution was studied and the results are discussed. The relationship between the crystallinity, molecular weight, stereo-defect distribution and dynamic and mechanical properties of samples was investigated.
- Subjects
POLYPROPYLENE; POLYOLEFIN synthesis; ZIEGLER-Natta catalysts; METHYLSILANE; CRYSTALLINITY; CRYSTALLIZATION
- Publication
Polymer Science -- Series A, 2015, Vol 57, Issue 5, p573
- ISSN
0965-545X
- Publication type
Article
- DOI
10.1134/S0965545X15050090