Temperature-dependent changes in the hydrogen bonded hard segment network and microphase morphology in a model polyurethane: Experimental and simulation studies
| Autor: | Iskender Yilgor, Erol Yildirim, Garth L. Wilkes, Mine Yurtsever, Emel Yilgor |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Hydrogen Hydrogen bond Dissipative particle dynamics Thermodynamics chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Amorphous solid Crystallinity Molecular dynamics chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry 0210 nano-technology Stoichiometry Polyurethane |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 56:182-192 |
| ISSN: | 0887-6266 |
| DOI: | 10.1002/polb.24532 |
| Popis: | Hydrogen bonding between hard segments has a critical effect on the morphology and properties of polyurethanes. Influence of temperature on hydrogen bonded urethane network and melting behavior of a model semicrystalline segmented polyurethane was investigated by experiments and simulations. Polyurethane was synthesized by the stoichiometric reaction between p-phenylene diisocyanate and poly(tetramethylene oxide) (PTMO) with a molecular weight of 1000 g/mol. Simulations were carried out using dissipative particle dynamics (DPD) and molecular dynamics (MD) approaches. Experimental melting behavior obtained by various techniques was compared with simulations. DPD simulations showed a room temperature microphase morphology consisting of a three-dimensional hydrogen-bonded urethane hard segment network in a continuous and amorphous PTMO matrix. The first-order melting transitions of crystalline urethane hard segments observed during the continuous isobaric heating in DPD and MD simulations (340–360 K) were in reasonably good agreement with those observed experimentally, such as AFM (320–340 K), WAXS (330–360 K), and FTIR (320–350 K) measurements. Quantitative verification of the melting of urethane hard segments was demonstrated by sharp discontinuities in energy versus temperature plots obtained by MD simulations due to substantial decrease in the number of hydrogen bonds above 340 K. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017. |
| Databáze: | OpenAIRE |
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