Structure–property behavior of segmented polyurethaneurea copolymers based on an ethylene–butylene soft segment
| Autor: | Frederick L. Beyer, Derek B. Klinedinst, Garth L. Wilkes, Emel Yilgor, Iskender Yilgor |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Polymers and Plastics Scattering Small-angle X-ray scattering Organic Chemistry Dynamic mechanical analysis Amorphous solid chemistry.chemical_compound Differential scanning calorimetry chemistry Materials Chemistry Stress relaxation Copolymer Hexamethylene diisocyanate Composite material |
| Zdroj: | Polymer. 46:10191-10201 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2005.07.065 |
| Popis: | Novel segmented polyurethaneurea copolymers were synthesized using a poly(ethylene–butylene) glycol based soft segment and either hydrogenated diphenyl methane diisocyanate (HMDI) or hexamethylene diisocyanate (HDI) in addition to either ethylene diamine (EDA) or 2-methyl-1,5-diaminopentane (DY) as the chain extender. Dynamic mechanical analysis (DMA), small angle X-ray scattering (SAXS) and in some cases atomic force microscopy (AFM) established the presence of a microphase-separated structure in which hard microdomains are dispersed throughout a soft segment matrix. Wide angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) imply that the materials are amorphous. Samples that are made with HMDI/DY and have hard segment contents in the range of 16–23 wt% surprisingly exhibit near-linear mechanical deformation behavior in excess of 600% elongation. They also show very high levels of recoverability even though their hysteresis is also considerable. The materials have all proven to be melt processable in addition to solution processable. |
| Databáze: | OpenAIRE |
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