Synthesis and characterization of an ultra-soft poly(carbonate urethane)
| Autor: | Elisa Marangon, Garrett Craft, Julie P. Harmon, Cedric Marrouat, Tamalia C. M. Julien, Kenneth L. Kull, Roger W. Bass |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Polymers and Plastics Small-angle X-ray scattering Organic Chemistry General Physics and Astronomy Elastomer Thermoplastic polyurethane Natural rubber visual_art Ultimate tensile strength Materials Chemistry visual_art.visual_art_medium Shore durometer Composite material Polycarbonate Glass transition |
| Zdroj: | European Polymer Journal. 71:510-522 |
| ISSN: | 0014-3057 |
| Popis: | A high performance, thermoplastic polyurethane elastomer was synthesized with methylene bis(4-cyclohexylisocyanate), 1,4-butanediol as a chain extender and a polycarbonate polyol containing 1,6-hexanediol and 3-methyl-1,5-pentanediol. SAXS data evidences an interdomain “center-to-center” distance of 45 A. DSC traces evidence one glass transition temperature and weak melting region. Surprisingly, the material is ultra-soft with a Shore A hardness of 64, but does not undergo any blocking. DMA analysis reveals a low temperature secondary relaxation and the glass to rubber transition followed by a rubbery plateau. In tensile set experiments strain recovery averaged 96–98%. The PCPU exhibits partial self-healing after rupture without the addition of additives or imbedded healing agents. Self-healing is attributed to interdiffusion and hydrogen bonding mechanism, where rehealing is possible. FTIR measurements characterize hydrogen bonding. |
| Databáze: | OpenAIRE |
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