Stretchable Polymer Electronics and Mechanical Properties

Stretchable polymer electronics integrate soft, deformable materials with electronic functionality, enabling devices that conform to moving surfaces such as human skin or flexible textiles. Central to their performance is the interplay between electrical properties—chiefly charge carrier mobility—and mechanical robustness under repeated strain. Advances in molecular design, processing and composite formation have led to polymers that combine high conductivity with large fracture strains, tailoring microstructure and phase behaviour at multiple scales. Control of crystallinity, side-chain chemistry and crosslinking density allows precise tuning of stiffness, ductility and elasticity, while emerging strategies leverage energy dissipation mechanisms to recover original morphology and performance after deformation. Understanding the glass transition temperature and phase transitions further informs design rules for soft, durable, high-performance stretchable semiconductors and dielectrics. The global significance of this field spans wearable health monitors, soft robotics, conformal displays and implantable bioelectronics, where reliable operation under mechanical stress is essential.

Research from Nature Portfolio

Highly stretchable polymer semiconductor thin films have been engineered to exhibit multi-modal energy dissipation, quantified by a relative stretchability parameter (rS) that relates entropic to enthalpic energy loss under strain. Thin films with high rS recover both molecular ordering and electrical performance after 100 % biaxial stretch, achieving charge carrier mobilities around 0.2 cm2 V−1 s−1. A universal design strategy has introduced randomly distributed co-monomer units to reduce long-range order while preserving short-range aggregates, yielding intrinsically stretchable semiconductors with stable mobility under 1 000 stretch cycles and minimal morphological change. Foundational work on correlating glass transition temperature with molecular structure has provided a predictive framework for selecting conjugated backbones and side-chains to meet specific mechanical and thermal criteria, thus guiding the design of soft electronics with tailored Tg and improved mechanical resilience.

Stretchable Polymer Electronics and Mechanical Properties publication trend

The graph below shows the total number of articles in stretchable polymer electronics and mechanical properties across all publications each year (not limited to Nature Index journals).

Technical terms

Conjugated polymer: A polymer with alternating single and double bonds along its backbone, enabling delocalised electronic states for charge transport.

Glass transition temperature (Tg): The temperature at which an amorphous polymer transitions from a brittle, glassy state to a more flexible, rubbery state.

Charge carrier mobility: A measure of how quickly electrons or holes can move through a semiconductor under an electric field.

Energy dissipation: The process by which mechanical energy is converted to heat or stored entropy during deformation, including entropic (reversible) and enthalpic (bond-stretching) contributions.

Relative stretchability (rS): A dimensionless ratio of entropic to enthalpic energy dissipation used to predict the recoverability and reliability of stretchable thin films.

References

1. Highly stretchable polymer semiconductor thin films with multi-modal energy dissipation and high relative stretchability. Nature Communications (2023).
2. A design strategy for high mobility stretchable polymer semiconductors. Nature Communications (2021).
3. Glass transition temperature from the chemical structure of conjugated polymers. Nature Communications (2020).
4. Impact of doping on the mechanical properties of conjugated polymers. Chemical Society Reviews (2024).
5. A Semi‐Crystalline Polymer Semiconductor with Thin Film Stretchability Exceeding 200%. Advanced Science (2023).