Shape-Anisotropic Polyimide Particles by Solid-State Polycondensation of Monomer Salt Single Crystals
| Autor: | Berthold Stöger, D. Alonso Cerrón-Infantes, Miriam M. Unterlass, Konstantin Kriechbaum |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Diffraction Quantitative Biology::Biomolecules Condensation polymer Materials science Polymers and Plastics Organic Chemistry Salt (chemistry) Crystal structure Colloidal crystal Condensed Matter::Soft Condensed Matter Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Chemical engineering Polymer chemistry Materials Chemistry Anisotropy Polyimide |
| Zdroj: | Macromolecules. 48:8773-8780 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.5b01545 |
| Popis: | Shape-anisotropic particles are of broad interest, e.g., for colloidal crystals or applications at interfaces such as particle-stabilized emulsions. Despite the wealth of accessible shapes of inorganic particles, anisotropic homopolymer particles are to date mostly limited to objects derived from spheres (e.g., ellipsoidal or disk-shaped particles). Here, we report the synthesis of shape-anisotropic, angular polyimide particles by thermal solid-state polycondensation (SSP) of monomer salts. We prepare monomer salt single crystals of relatively narrow size and shape distribution by growth inside hydrogels, and solve their crystal structure. Polyimide particles are obtained by simple heating and retain the shape of the initial salt crystals. Using high-temperature X-ray diffraction, thermal analyses and microscopy techniques, we investigate the mechanism of the transformation. The obtained polyimide particles are temperature-stable up to 640 °C and virtually insoluble in any solvent. This work sheds more li... |
| Databáze: | OpenAIRE |
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