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Polymer Bulletin

, Volume 71, Issue 9, pp 2437–2452 | Cite as

Electrospun polylactic acid non-woven mats incorporating silver nanoparticles

  • H. Vargas-Villagran
  • A. Romo-UribeEmail author
  • E. Teran-Salgado
  • M. Dominguez-Diaz
  • A. Flores
Original Paper

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.

Keywords

Differential Scanning Calorimetry Contact Angle Water Contact Angle Cold Crystallization Water Contact Angle Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

PLA

Polylactic acid

Tm

Melting transition temperature

Tc

Crystallization transition temperature

Tg

Glass transition temperature

Tcc

Cold crystallization temperature

Tdec

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

Notes

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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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • H. Vargas-Villagran
    • 1
  • A. Romo-Uribe
    • 1
    Email author
  • E. Teran-Salgado
    • 1
  • M. Dominguez-Diaz
    • 1
  • A. Flores
    • 2
  1. 1.Laboratorio de Nanopolimerios y Coloides, Instituto de Ciencias FisicasUniversidad Nacional Autonoma de MexicoCuernavacaMexico
  2. 2.Departamento de Fisica MacromolecularInstituto de Estructura de la Materia (IEM-CSIC)MadridSpain

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