Tailoring the morphology and crystallinity of poly(L-lactide acid) electrospun membranes
[EN] Biodegradable poly(L-lactic acid) (PLLA) microfibers were prepared by electrospinning by varying the applied potential, solution flow rate and collector conditions. PLLA fibers with smoothly oriented and random morphologies were obtained and characterized by scanning electron microscopy. The op...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2011 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/30016 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/30016 |
| Access Level: | acceso abierto |
| Palabra clave: | Crystallinity Electrospinning Membranes PLLA Applied potentials Crystal nuclei Crystallinities Degree of crystallinity Drum rotation speed Electrospun fibers Electrospun membranes Fiber orientations Infrared transmission spectra L-lactide Metastable phase Microfibers Molecular levels Poly L lactic acid Processing condition Random fibers Random motions Solution flow rate Fibers Lactic acid Metastable phases Morphology Organic polymers Rapid solidification Scanning electron microscopy MAQUINAS Y MOTORES TERMICOS |
| Sumario: | [EN] Biodegradable poly(L-lactic acid) (PLLA) microfibers were prepared by electrospinning by varying the applied potential, solution flow rate and collector conditions. PLLA fibers with smoothly oriented and random morphologies were obtained and characterized by scanning electron microscopy. The optimum fiber orientation was obtained at 1000 rpm using a 20.3 cm diameter collecting drum, while for higher and lower drum rotation speeds, the rapid random motion of the jets resulted in a random fiber distribution. The deformation of the jet with rapid solidification during electrospinning often results in a metastable phase. PLLA electrospun fibers are amorphous but contain numerous crystal nuclei that rapidly grow when the sample is heated to 70-140 °C. In this way, the degree of crystallinity of the fibers can be tailored between 0 and 50% by annealing. Infrared transmission spectra revealed that the processing conditions do not affect the PLLA samples at the molecular level and that the crystallinity of the samples is related to the presence of ¿-crystals. © 2011 National Institute for Materials Science. |
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