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Optimising molecular weight: key to stretchable conjugated polymers
A new review explains how fine-tuning the molecular weight of intrinsically stretchable conjugated polymers can improve mechanical reliability and maintain electrical performance under strain — vital for future wearable electronics.
Intrinsically stretchable conjugated polymers are seen as promising candidates for next-generation wearable electronics. These materials offer the advantage of retaining stable optoelectronic properties even when deformed mechanically — an essential requirement for flexible devices. However, achieving this strain-insensitive performance depends heavily on the careful optimisation of molecular weight.
In this comprehensive review, the research team outlines how molecular weight influences the microstructure of polymer films, affecting solution aggregation, chain entanglement and phase separation. These factors, in turn, determine the films’ mechanical flexibility and charge transport capabilities.
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Linking morphology control to reliable electronics
The authors describe in detail how different molecular weights alter intrachain and interchain charge transport behaviour, directly impacting electrical performance. Furthermore, the paper examines how these parameters affect the way films dissipate strain energy, ensuring durability and functionality during repeated stretching.
In their outlook, the researchers emphasise that controlling molecular weight is a promising strategy for designing mechanically robust stretchable conjugated polymer films. Such advancements could play a pivotal role in realising reliable, high-performance wearable electronic devices.
Source: Ding et al., Journal of Materials Chemistry C, Issue 25, 2025
