Microstructure of elastomeric polypropylenes obtained with nonsymmetric ansa-titanocene catalysts
| Autor: | Geraldo Hidalgo Llinas, G. N. Babu, Richard A. Newmark, James C. W. Chien, H. N. Cheng |
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| Rok vydání: | 1992 |
| Předmět: |
Polypropylene
Materials science Polymers and Plastics Organic Chemistry Methylaluminoxane chemistry.chemical_element Carbon-13 NMR Inorganic Chemistry chemistry.chemical_compound chemistry Tacticity Polymer chemistry Materials Chemistry Ziegler–Natta catalyst Thermoplastic elastomer Metallocene Titanium |
| Zdroj: | Macromolecules. 25:7400-7402 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00052a052 |
| Popis: | The 13 C NMR spectra of TPE polypropylene produced by the catalysts rac-[anti-ethylidene(1-η 5 -tetramethycyclopentadienyl)(1-η 5 -indenyl)titanium dichloride/methylaluminoxane and the dimethyl derivative have benn analyzed by two-state stereochemical control models. If it is assumed that the polymer consists of amorphous and crystalline blocks, the tacticity and the tacticity distribution data favor the consecutive model. The NMR results indicate that only a fraction of the stereoregular segments are phase separated into the crystalline domains |
| Databáze: | OpenAIRE |
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