Journal of Polymer Research

, 21:605 | Cite as

Enhancing the crystallization and orientation of electrospinning poly (lactic acid) (PLLA) by combining with additives

  • Ahmed M. El-Hadi
  • Saeed D. Mohan
  • Fred J. Davis
  • Geoffrey R. Mitchell
Original Paper


PLLA is a thermoplastic biopolymer and can be used in industrial applications for medical and filtration applications. The brittleness of PLLA is attributed to slow crystallization rates and its glass transition temperature (Tg) is high (60 °C); for this reason, its applications are limited. The orientation, morphology, and crystal structure of the electrospun fibers was investigated by SEM, POM, DSC, FTIR, XRD, and SAXS. Combining with additives leads to a large decrease of fiber diameter, viscosity, and changes of fiber morphology and crystal structure compared to pure PLLA. DSC showed that the Tg of PLLA decreased about 15 °C and there was no change in relaxation enthalpy by the addition of plasticizer. FT-IR indicate a strong interaction between PLLA and additives; a new band appears in the PLLA blend at 1,756 cm−1 at room temperature as a crystalline band without any annealing. In addition, WAXD indicated that the intensities of the two peaks at (200/110) and (203) increased for the blend at room temperature without any annealing in comparison with PLLA; this means that PHB crystallizes in the amorphous region of PLLA. The POM experiments agree with the results from DSC, FTIR, and WAXS measurements, confirming that adding PHB results in an increase in the number of nuclei with much smaller spherulites and enhances the crystallization behavior of this material, thereby improving its potential for applications.


PHB PLLA Biopolymer blends Electrospinning Nano fibers 



The author thanks SABIC company for petrochemicals (Research & Consulting Center) and Institute of Scientific Research for supporting this project (grant number: 43005001).


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Ahmed M. El-Hadi
    • 1
    • 2
  • Saeed D. Mohan
    • 3
  • Fred J. Davis
    • 3
  • Geoffrey R. Mitchell
    • 3
  1. 1.Department of Physics, Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia
  2. 2.Department of Basic ScienceHigher Institute for Engineering and TechnologyEl ArishEgypt
  3. 3.Centre for Advanced MicroscopyUniversity of ReadingReadingUK

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