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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Published on: October 23, 2015

Linear/network poly(ε-caprolactone) blends exhibiting shape memory assisted self-healing (SMASH).

Erika D Rodriguez¹, Xiaofan Luo, Patrick T Mather

¹Mechanical and Aerospace Engineering, Syracuse University, New York 13244, USA.

ACS Applied Materials & Interfaces

|January 22, 2011

Summary

This study introduces shape memory assisted self-healing (SMASH) polymers that autonomously repair cracks using a thermal trigger. The novel SMASH polymers blend shape memory networks with linear polymers for efficient crack closure and rebonding.

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Area of Science:

Polymer Science
Materials Science
Mechanical Engineering

Background:

Self-healing (SH) polymers can autonomously repair mechanical damage.
Previous SH polymers often require manual intervention for crack closure.
Simultaneous crack closure and rebonding remain a significant challenge.

Purpose of the Study:

To develop a novel self-healing polymer strategy utilizing shape memory (SM).
To demonstrate a shape memory assisted self-healing (SMASH) mechanism in a polymer blend.
To investigate the composition-dependent healing efficiency of SMASH polymers.

Main Methods:

Formulation of a blend system with cross-linked poly(ε-caprolactone) (n-PCL) and linear poly(ε-caprolactone) (l-PCL).
Utilizing thermomechanical analysis to characterize shape memory properties of n-PCL.
Employing tensile testing of essential work of fracture specimens to assess SMASH healing efficiency.

Main Results:

The n-PCL component exhibited reversible plasticity, a form of shape memory.
The SMASH strategy effectively closed and rebonded cracks upon thermal triggering.
Near-complete self-healing was achieved in blends with over 25 wt% l-PCL.

Conclusions:

The SMASH strategy offers an effective method for autonomous crack repair in polymers.
The blend system demonstrates synergistic shape memory and self-healing capabilities.
SMASH polymers show promise for applications in self-healing bladders and membranes.