Characterization of Nano-Structured Poly(D,L-lactic acid) Nonwoven Mats Obtained from Different Solutions by Electrospinning

Autor(es)

Branciforti, Marcia Cristina ^[1] ; Custodio, Tassiana Araujo ^[1] ; Guerrini, Lilia Muller ^[1] ; Averous, Luc ^[2] ; Suman Bretas, Rosario Elida ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Strasbourg, Lab Ingn Polymeres Hautes Technol, Strasbourg - France

• Tipo de documento: Artigo Científico
• Fonte: Journal of Macromolecular Science : Physics; v. 48, n. 6, p. 1222-1240, 2009.
• Área do conhecimento: Engenharias - Engenharia de Materiais e Metalúrgica
• Citações Web of Science: 20
• Assunto(s): Materiais não metálicos Materiais nanoestruturados Polímeros (materiais)

Resumo

Two different solvent mixtures, chloroform/dimethylformamide (DMF) and chloroform/ acetone, in 60/40 v/v concentrations, were used to electrospin poly(D,L-lactic acid) (PDLLA). The influence of solvent type, solution concentration, and processing conditions on the morphology and properties of the electrospun mats was studied. The nanofibers characterization was done by scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). The smallest nanofibers' diameters from both mixtures were obtained from solutions with 5 wt%/v PDLLA concentration using a 1.0 kV/cm electrical field. In general the nanofibers from the chloroform/DMF mixture had smaller diameters than the nanofibers from the chloroform/acetone mixture. However, the latter ones were porous, while the nanofibers from the chloroform/DMF mixtures were not. All the PDLLA nanofibers, independent of solvent mixture, had a very low amount of crystallinity and were composed of very small and imperfect and BETA crystals. (AU)

• Processo FAPESP: 05/60187-0 - Obtenção de nanofibras por eletrofiação
• Beneficiário: Rosario Elida Suman Bretas
• Modalidade de apoio: Auxílio à Pesquisa - Regular