Journal of Materials Science

, Volume 39, Issue 9, pp 3003–3013

Nano-sized beads and porous fiber constructs of Poly(ε-caprolactone) produced by electrospinning


DOI: 10.1023/

Cite this article as:
Hsu, CM. & Shivkumar, S. Journal of Materials Science (2004) 39: 3003. doi:10.1023/


Nano-sized beads and non-woven porous fiber constructs of poly(ε-caprolactone) were produced by electrospinning. Nearly spherical beads with diameters between 900 nm and 5 μm were produced with dilute solutions with less than 3 wt% PCL. In this case, the initial jet of solution may split into many mini jets almost at the end of the needle and each minijet gradually disintegrates into small droplets. Beyond a critical solution concentration of about 4 wt% PCL, the jet may undergo extensional flow, splitting and splaying to produce a web of interconnected fibers with mean diameters on the order of 300 to 900 nm. Intermolecular entanglements play a dominant role in stabilizing the fibrous structure. A uniform fibrous structure was obtained at 40 kV while at 20 kV a large fraction of beads were present in the electrospun polymer. The fiber diameter in the PCL deposited on the collector typically exhibits a bimodal distribution. Electrospinning lowers the degree of crystallinity in the polymer.

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringWorcester Polytechnic InstituteWorcesterUSA

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