Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 12, Issue 1, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/12/1/015001
Keywords
PLLA; membranes; electrospinning; crystallinity
Categories
Funding
- Portuguese Foundation for Science and Technology (FCT) [PTDC/CTM/73030/2006, PTDC/CTM/69316/2006, NANO/NMed-SD/0156/2007]
- FCT [SFRH/BPD/63148/2009]
- Spanish Ministry of Education [MAT2010-21611-C03-01]
- FEDER
- Centro de Investigacion Principe Felipe
- Conselleria de Sanidad (Generalitat Valenciana)
- Instituto de Salud Carlos III (Ministry of Science and Innovation)
- Fundação para a Ciência e a Tecnologia [PTDC/CTM/73030/2006, PTDC/CTM/69316/2006, NANO/NMed-SD/0156/2007] Funding Source: FCT
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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 degrees 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 alpha-crystals.
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