Phase equilibrium and rheology of poly(1-trimethylsilyl-1-propyne) solutions
| Autor: | V. S. Khotimskii, M. P. Arinina, Valery G. Kulichikhin, V. V. Makarova, Sergey O. Ilyin, E. G. Litvinova |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Intrinsic viscosity Tantalum chemistry.chemical_element 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Viscoelasticity 0104 chemical sciences Shear rate Viscosity Hildebrand solubility parameter chemistry Rheology Chemical engineering Polymer chemistry Materials Chemistry 0210 nano-technology |
| Zdroj: | Polymer Science, Series A. 59:1-11 |
| ISSN: | 1555-6107 0965-545X |
| DOI: | 10.1134/s0965545x17010059 |
| Popis: | The phase equilibrium and rheological properties of poly(1-trimethylsilyl-1-propyne) solutions obtained with tantalum catalysts are studied. For three polymers with different molecular masses, phase diagrams are determined in a number of solvents. From these diagrams, the Hansen solubility parameters of poly(1-trimethylsilyl-1-propyne) are calculated by the method proposed in this work. Dilute solutions of poly(1-trimethylsilyl-1-propyne) behave as Newtonian liquids, whereas the viscosity of viscoelastic concentrated systems decreases as the shear rate grows. The molecular and rheological characteristics of studied poly(1-trimethylsilyl-1-propyne) samples are compared with the samples prepared with NbCl5 catalysts. Poly(1-trimethylsilyl-1-propyne) obtained with a catalytic system involving tantalum pentachloride is characterized by high intrinsic viscosity and solution viscosity compared to poly(1-trimethylsilyl-1-propyne) prepared with niobium catalyst. The difference in properties is due to the dissimilar ratios of cis and trans units in the samples. |
| Databáze: | OpenAIRE |
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