Crystallization Behavior of Poly(ethylene oxide) and Its Blends Using Time-Resolved Wide- and Small-Angle X-ray Scattering
| Autor: | James Runt, F. Yeh, Melissa S. Lisowski, Jaedong Cho, Qiang Liu, Benjamin S. Hsiao |
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| Rok vydání: | 2000 |
| Předmět: |
Materials science
Polymers and Plastics Ethylene oxide Small-angle X-ray scattering Organic Chemistry Oxide Diluent law.invention Amorphous solid Inorganic Chemistry chemistry.chemical_compound Chemical engineering chemistry law Polymer chemistry Materials Chemistry Lamellar structure Crystallization Methyl methacrylate |
| Zdroj: | Macromolecules. 33:4842-4849 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma000207c |
| Popis: | Time-resolved synchrotron wide- and small-angle X-ray scattering experiments were used to investigate the crystallization behavior and microstructure development of poly(ethylene oxide) and several melt-miscible PEO blends. Model blends were prepared with both weakly interacting poly(methyl methacrylate) and two strongly interacting random copolymers. Average SAXS long periods and lamellar thicknesses decreased at early crystallization times: by 2−3 nm for PEO and blends containing the low Tg diluent and by ∼5−9 nm for blends containing higher Tg diluents. The latter appears to arise in part from additional restrictions placed on the growing lamellae by the stiff, high Tg amorphous polymeric diluents. The increase in final long period over that of neat PEO was ∼2−4 nm for the weakly interacting blends, as opposed to as large as 10 nm for the strongly interacting mixtures. In the former case, the changes are associated with interlamellar diluent placement, while in the latter they result primarily from an... |
| Databáze: | OpenAIRE |
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