Influence of Hydrogen Bonding on the Crystallization Behavior of Semicrystalline Polyurethanes
| Autor: | Robin Lynn Mckiernan, Shaw Ling Hsu, Amy M. Heintz, Samuel P. Gido, Edward D. T. Atkins, Jacques Penelle |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Polymers and Plastics Hydrogen Hydrogen bond Organic Chemistry Infrared spectroscopy chemistry.chemical_element law.invention Inorganic Chemistry chemistry.chemical_compound Crystallinity chemistry Electron diffraction law Polymer chemistry Materials Chemistry Molecule Crystallization Polyurethane |
| Zdroj: | Macromolecules. 35:6970-6974 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma0201274 |
| Popis: | A series of linear, aliphatic m,n-polyurethanes [O−(CH2)m−O−C(O)−NH−(CH2)n−NH−C(O)]x derived from long-chain aliphatic diols HO−(CH2)m−OH, where m = 12, 22, or 32, and much shorter diisocyanates OCN−(CH2)n−NCO, where n = 4, 6, 8, or 12, were previously characterized and shown to have physical and thermal properties similar to polyethylene. The current study shows, however, that hydrogen bonding still exercises a controlling influence on the crystallization process of these long-chain, aliphatic polyurethanes. X-ray diffraction, electron diffraction, and infrared spectroscopy indicate that these long alkane segment polyurethanes have interchain and intersheet distances similar to that seen for polyamides and polyurethanes of higher hydrogen bonding densities. Hydrogen bonding controls the crystallization, packing, and morphology of these polyurethanes, resulting in a crystal structure analogous to that of aliphatic, even−even (syncephlic) polyamides and unlike that of polyethylene. Additionally, high-tempe... |
| Databáze: | OpenAIRE |
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