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Electrospun polylactic acid non-woven mats incorporating silver nanoparticles

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Abstract

This research is focused on the influence of silver nanoparticles (AgNPs) on the spinnability, morphology and wetting properties of electrospun polylactic acid (PLA) non-woven mats. PLA was electrospun from a chloroform solution (4.7 % g/g) and a filament and beads morphology was obtained, the filaments having an average diameter of 1.25 μm. Interestingly, water contact angle measurements showed a contact angle of θ = 81°, an improvement relative to as-cast film which exhibited a contact angle of θ = 54°. When AgNP, of ca. 12 nm size, were incorporated at 1 % g/g relative to PLA weight, to the 4.7 % PLA-chloroform solution, and electrospun, the filaments diameter was greatly reduced to an average of 0.65 μm, and the density of polymer beads was also reduced. It is believed that the electric conductivity of silver enhanced the spinnability of the polymer solution. Strikingly, water contact angle measurements showed that the PLA/AgNP mats exhibited an angle as high θ = 134°. Increasing the solution concentration to 6.7 % g/g still produced a beads-and-filament morphology, but with larger filament diameters, probably due to an increase in solution viscosity. When AgNP were added (again at 1 % g/g relative to PLA weight), the occurrence of beads diminished and the average filament diameter decreased confirming the enhancement in spinnability by the AgNPs. Moreover, contact angles remained above 110° suggesting that the overall morphology is key to PLA’s mats hydrophobic behavior and not only filament diameter. Finally, the non-woven mats were rather amorphous, as revealed by differential scanning calorimetry and X-ray scattering, due presumably to the quenching process associated with the electrospinning process.

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Abbreviations

PLA:

Polylactic acid

T m :

Melting transition temperature

T c :

Crystallization transition temperature

T g :

Glass transition temperature

T cc :

Cold crystallization temperature

T dec :

Decomposition temperature

TGA:

Thermogravimetric analysis

DSC:

Differential scanning calorimetry

FTIR:

Fourier transform infrared spectroscopy

ATR:

Attenuated total reflectance

WAXS:

Wide-angle X-ray scattering

Cu Kα :

Copper radiation source

POM:

Polarized optical microscopy

λ :

Wavelength

ν :

Wavenumber

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Acknowledgments

H. Vargas-Villagran, E. Teran-Salgado and M. Domínguez-Díaz were supported by graduate scholarships from the Mexican Council for Science and Technology (CONACyT). Thanks are due to MICINN, Spain (grant FIS2010-18069) for generous financial support. Thanks are due to BIPEDD-2: S2010-BMD-2457 Comunidad de Madrid, Spain, for providing the facilities to carry out the X-ray diffraction experiments. This research was partially supported by CONACyT, under SEP-CONACyT CB2011 program, grant 168095. We thank Dr. R. Guardian Tapia (CIICAp-UAEM) and Mr. I. Puente Lee (F.Q.-UNAM) for help with SEM.

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Authors and Affiliations

  1. Laboratorio de Nanopolimerios y Coloides, Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Av. Universidad s/n Col. Chamilpa, 62210, Cuernavaca, MOR, Mexico

    H. Vargas-Villagran, A. Romo-Uribe, E. Teran-Salgado & M. Dominguez-Diaz

  2. Departamento de Fisica Macromolecular, Instituto de Estructura de la Materia (IEM-CSIC), Serrano 119, 28006, Madrid, Spain

    A. Flores

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  1. H. Vargas-Villagran
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Correspondence to A. Romo-Uribe.

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Vargas-Villagran, H., Romo-Uribe, A., Teran-Salgado, E. et al. Electrospun polylactic acid non-woven mats incorporating silver nanoparticles. Polym. Bull. 71, 2437–2452 (2014). https://doi.org/10.1007/s00289-014-1200-8

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