Highly Stretchable Polyurethane (PU) Film as Substrates for Flexible Bioelectronics, 5 pcs/pack, CFBSHSPUF
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Highly stretchable polyurethane (PU) and thermoplastic polyurethane (TPU) films serve as foundational substrates and encapsulation layers in flexible bioelectronics. Their molecular structure—alternating hard segments (providing physical cross-links and mechanical strength) and soft segments (yielding high chain mobility and elasticity)—allows for Young's moduli that closely match biological tissues (10 kPa - 100 MPa), bridging the mechanical mismatch between human skin and rigid electronic components.
The main features of the Stretchable PU film are: (1) Low Modulus & High Elasticity: Tunable elongation at break (> 500–1000%) with low mechanical hysteresis under cyclic deformation, ensuring conformal contact with curvilinear, dynamic skin surfaces without delamination. (2) Biocompatibility & Cytotoxicity: Medical-grade aliphatic PUs and waterborne polyurethanes (WPU) avoid cytotoxic leaching (such as residual aromatic isocyanates or tin catalysts), preventing contact dermatitis during long-term epidermal wear. (3) Moisture Permeability & Breathability: Solid dense PU films can trap sweat; electrospun fibrous PU membranes or phase-inversion micro-porous films achieve high Water Vapor Transmission Rates (WVTR> 2000–5000 g/m^2/day), suppressing skin maceration and motion-artifact noise. (4) Substrate & Encapsulation Barrier: High dielectric breakdown strength (> 20–50 kV/mm) and chemical resistance against biofluids (sweat, interstitial fluid, saline), providing stable electrical insulation for embedded sensor traces.
| Part Number | CFBSHSPUF (C-FB-S-HSPUF) |
| Material | Modified PU |
| Thickness | 25 um, 50 um and 100 um |
| Sizes | A4 paper size: ~210* 300mm |
| Elongation at Break | >1000 % |
| Elasticity Modulus | 10 MPa |
| Primary Applications | The stretchable PU film is mainly used as flexible substrate for conductive ink printing, which can be used for electronic skin, electronic tattoo, and wearable electronics. |
| Package Grade | 5 pcs/pack |
References:
- Y. Hao, et al., A Stretchable, Breathable, And Self-Adhesive Electronic Skin with Multimodal Sensing Capabilities for Human-Centered Healthcare, Adv. Funct. Mater., 2023, 33, 2303881.
- J. Wu. et al. Highly Flexible and Sensitive Wearable E‑Skin Based on Graphite Nanoplatelet and Polyurethane Nanocomposite Films in Mass Industry Production Available, ACS Appl. Mater. Interfaces (2017) 9 (44): 38745–38754.