Synthesis and Rheological Properties of Poly(5-n-hexylnorbornene)
| Autor: | Kurt Dehnicke, Youngsuk Jung, Lewis J. Fetters, Dieter Richter, Andreas Greiner, Do Y. Yoon, Jürgen Allgaier, Kerstin Müller, Stefan Kreiling |
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| Rok vydání: | 2006 |
| Předmět: |
Polymers and Plastics
Intrinsic viscosity Organic Chemistry Size-exclusion chromatography Extrapolation Condensed Matter Physics Light scattering chemistry.chemical_compound chemistry Polymerization Rheology Polymer chemistry Materials Chemistry Thermal stability Physical and Theoretical Chemistry Tetrahydrofuran |
| Zdroj: | Macromolecular Chemistry and Physics. 207:193-200 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/macp.200500228 |
| Popis: | Poly(5-n-hexylnorbornene) (PHNB) was obtained in high molecular weight and high yields by vinyl-type polymerization of 5-n-hexyl-2-norbornene (endo/exo=77/ 23) with [NiBr(NPMe 3 )] 4 /B(C 6 F 5 ) 3 as catalyst precursor. The combination of size exclusion chromatography with on-line light scattering and intrinsic viscosity measurements allowed the Mark-Houwink expressions to be evaluated in tetrahydrofuran. The unperturbed chain dimensions for poly(5-n-hexylnorbomene) were estimated via the extrapolation procedure of Burchard-Stockmayer-Fixman. This evaluation of the unperturbed chain dimension in turn permits the calculation of the entanglement molecular weight and the plateau modulus via the packing length model. This allows the determination of rheological properties for these materials where conventional rheology measurements are difficult, or impossible. |
| Databáze: | OpenAIRE |
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