Mechanical Properties of Osmotically Stressed Polyelectrolyte Complexes and Multilayers: Water as a Plasticizer
| Autor: | Joseph B. Schlenoff, Ali M. Lehaf, Haifa H. Hariri |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Polymers and Plastics Osmotic shock Organic Chemistry Plasticizer medicine.disease Polyelectrolyte Inorganic Chemistry Stress (mechanics) chemistry.chemical_compound Brittleness chemistry Chemical engineering PEG ratio Polymer chemistry Materials Chemistry medicine Dehydration Ethylene glycol |
| Zdroj: | Macromolecules. 45:9364-9372 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma302055m |
| Popis: | Compacted, macroporous complexes of poly(styrenesulfonate) and poly(diallyldimethylammonium) were dehydrated under defined osmotic stress using poly(ethylene glycol), PEG. A strong mechanical response to dehydration was observed. At the lowest osmotic stress applied, macropores within the complex were compacted, and the material became transparent. With additional osmotic stress, the decrease in water content with increasing stress slowed considerably, but the complex became much stiffer, the equilibrium modulus reaching several hundred MPa. Concurrently, the complexes became more brittle. Multilayers of the same polyelectrolytes reached equilibrium hydration levels much faster and also increased significantly in modulus. Using an empirical fit, the plasticizing efficiency of water was shown to be exceptionally strong. |
| Databáze: | OpenAIRE |
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