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Molecular Entanglement and Electrospinnability of Biopolymers

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Published on: September 3, 2014

Do electrospun polymer fibers stick?

Qiang Shi¹, Kai-Tak Wan, Shing-Chung Wong

¹Department of Mechanical Engineering, University of Akron, Akron, Ohio 44325-3903, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 5, 2010

Summary

Adhesion between electrospun polycaprolactone (PCL) fibers was measured, revealing adhesion energy of 190 mJ/m². Adhesion increases as fiber radius decreases, offering insights for bio-inspired adhesives.

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Electrospinning Fundamentals: Optimizing Solution and Apparatus Parameters

Electrospinning Fundamentals: Optimizing Solution and Apparatus Parameters

Published on: January 21, 2011

Area of Science:

Materials Science
Nanotechnology
Biomaterials Engineering

Background:

Electrospun polycaprolactone (PCL) fibers are utilized in various biomedical applications.
Understanding fiber-fiber adhesion is crucial for predicting the mechanical properties of PCL constructs.
Direct measurement of adhesion forces at the nanoscale is challenging but essential.

Purpose of the Study:

To directly measure the adhesion forces between individual electrospun PCL fibers.
To investigate the relationship between fiber radius and adhesion.
To analyze the experimental adhesion data using established contact mechanics models.

Main Methods:

Direct adhesion force measurement using a nanoforce tensile tester in a cross-cylinder setup.
Surface roughness analysis via atomic force microscopy (AFM).
Structural characterization using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD).

Main Results:

Pull-off forces were measured in the order of 10⁻⁶ N.
Adhesion energy was determined to be 190 ± 7 mJ/m².
A clear trend of increasing adhesion with decreasing fiber radius was observed.

Conclusions:

The Johnson-Kendall-Roberts (JKR) model provides a suitable framework for analyzing PCL fiber adhesion.
Fiber radius is a critical parameter influencing the adhesion of electrospun PCL fibers.
Findings offer valuable insights for designing advanced bio-inspired adhesives and devices.