Intermolecular structural homogeneity of metallocene polyethylene copolymers
| Autor: | Qiang Fu, Jim D. Byers, Stephen Z. D. Cheng, Chung C. Tso, Timothy Walter Johnson, Eric Tsu-Yin Hsieh |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Intermolecular force General Chemistry Polymer Polyethylene Post-metallocene catalyst Condensed Matter Physics Branching (polymer chemistry) chemistry.chemical_compound chemistry Chemical engineering Polymer chemistry Materials Chemistry Copolymer Molar mass distribution Metallocene |
| Zdroj: | Journal of Macromolecular Science, Part B. 36:615-628 |
| ISSN: | 1525-609X 0022-2348 |
| DOI: | 10.1080/00222349708220445 |
| Popis: | Direct proof of intermolecular compositional inhomogeneity of a metallocene polyethylene copolymer has been obtained using a cross-fractionation (CF) technique. The ethylene/1-hexene copolymer sample was synthesized using a Zr-based homogeneous metallocene catalyst. A solvent gradient fractionation (SGF) applied to the whole polymer material has produced nearly monodispersed molecular weight distribution fractions. The component molecules of a representative SGF fraction are then further sorted out, using a temperature gradient fractionation technique, according to their short-chain branching (SCB) differences. Molecular characterization of the resulting CF fractions reveals the presence of significant intermolecular SCB content differences among the components of the sample material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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