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

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Thermal rectification of shape memory polymer composites by programmable conductivity modulation.

Seongkyun Kim¹, Dohyeong Lee¹, Seonghyun Bae¹

¹School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea. sbaik@skku.edu.

Materials Horizons

|February 16, 2026

Summary

This summary is machine-generated.

Researchers developed a novel shape memory polymer composite (SMPC) that exhibits significant thermal conductivity changes for thermal rectification. This material offers a new mechanism for controlling heat flow with high efficiency.

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Temperature-dependent thermal conductivity (κ) is crucial for thermal rectification.
Intrinsic κ modulation in solid materials is challenging.
Shape memory polymer composites (SMPC) offer tunable properties.

Purpose of the Study:

To develop a novel SMPC for thermal rectification.
To investigate the effect of shape memory behavior on thermal conductivity.
To achieve high thermal rectification efficiency.

Main Methods:

Combining cross-linked poly(ethylene-co-vinyl-acetate) with silver flakes.
Utilizing the matrix polymer volume change to modulate filler fraction.
Programming-recovery process to induce asymmetry in thermomechanical response.

Main Results:

Achieved a 210% change in electrical conductivity and 88% change in κ between 20-100 °C.
Demonstrated a novel thermal rectification mechanism based on modulated volumetric filler fraction.
Reached thermal rectification efficiencies of 38.3% at 0.15 W and 73.4% at ΔT = 45 °C.

Conclusions:

The developed SMPC shows significant potential for thermal rectification applications.
The material exhibits high thermal rectification efficiency at smaller temperature differences compared to existing literature.
The shape-changing ability of SMPC provides a unique pathway for tunable thermal transport.