Structure and dynamic/compositional heterogeneity in polycyanurate: Poly (tetramethylene glycol) hybrid networks
| Autor: | Bershtein, V.A., Egorov, V.M., Yakushev, P.N., David, Laurent, Fainleb, A.M., Grigorieva, O.P., Bei, I., Kripotou, S., Pissis, P. |
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| Přispěvatelé: | Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Polymères et des Biomatériaux (IMP-LMPB), Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of Macromolecular Science Part B Physics Journal of Macromolecular Science Part B Physics, Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2007, 46 (1), pp.207-230 |
| ISSN: | 0022-2348 1525-609X |
| Popis: | International audience; Structure and dynamics over the range from - 150 to 300°C were studied in a series of polycyanurate -poly(tetramethylene glycol) (PCN-PTMG) hybrid networks. Wide-angle x-ray diffraction (WAXD), small-angle x-ray scattering (SAXS), laser-interferometric creep rate spectroscopy (CRS), differential scanning calorimetry (DSC), and thermally stimulated depolarization currents (TSDC) techniques were applied. The networks were synthesized from the dicyanate ester of bisphenol A (DCEBA) and hydroxyl-terminated PTMG with Mn = 1000, 2000 or 5000 g/mol and weight fraction of 10, 20, 30, and 40%. The noncrystalline structure and the pronounced structural nanoheterogeneity, depending on PTMG chain length and PCN-PTMG ratio in the hybrid systems, were evidenced. Combined CRS/DSC analysis revealed a complex dynamics in these networks, in particular a dispersion of glass transitions in a wide temperature range. On this basis, the presence of nanodomains with different degrees of rigid cross-linking (XCN→PCN), i.e., compositional nanoheterogeneity in these hybrids was shown. The results obtained turned out to be of applied interest because of a substantial increase in tensile strength because of arising microplasticity at low temperatures, and retaining some creep resistance, at low stresses, up to temperatures much higher the basic Tg |
| Databáze: | OpenAIRE |
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