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Updated: Jun 5, 2026

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