Overview
Yellow Flexible Polyimide is an aromatic polymer synthesized through polycondensation of dianhydrides and diamines. Its molecular structure grants unparalleled thermal stability (withstanding -269°C to +400°C) while maintaining flexibility. First developed by Dupont in the 1960s as Kapton®, it revolutionized industries requiring lightweight, heat-resistant materials. The yellow coloration results from charge transfer complexes in the polymer chain, which don't compromise performance. Unlike rigid polyimides, flexible grades incorporate molecular design modifications that allow repeated bending without cracking, making them indispensable for dynamic applications.
Physical and Chemical Properties
This material exhibits a glass transition temperature (Tg) typically between 360-410°C, with decomposition starting around 500°C. It maintains tensile strengths of 100-300 MPa even at 0.05-0.125mm thicknesses, with elongation rates of 30-70%. The dielectric constant ranges from 3.1-3.5 at 1MHz, with low moisture absorption (<1%). Chemically, it resists most organic solvents, acids, and weak alkalis but may degrade in strong bases. UV resistance varies by formulation; some grades require carbon black additives for outdoor use. The material's CTE (Coefficient of Thermal Expansion) closely matches metals like copper (20-50 ppm/°C), preventing delamination in multilayer applications.
Main Applications
In electronics, it serves as substrate material for flexible printed circuits (FPCs) in smartphones, wearables, and foldable displays due to its solder resistance. Aerospace applications include wire insulation in aircraft and spacecraft, where its radiation resistance and flame-retardant properties (UL94 V-0 rated) are critical. Industrial uses encompass high-temperature conveyor belts, insulating tapes for electric motors, and release films for composite manufacturing. Emerging applications include flexible solar cells and biomedical devices, where its biocompatibility and sterilizability (via autoclave or gamma radiation) are advantageous.
Safety and Storage
While polyimide itself is non-toxic, machining processes may generate respirable dust requiring NIOSH-approved N95 masks. Finished films pose minimal risk but should be handled with clean gloves to prevent contamination. Store rolls vertically in original packaging at 15-30°C with <60% humidity. Avoid stacking heavy items on stored rolls to prevent deformation. Shelf life typically exceeds 5 years when properly stored. Before use in cleanrooms, surface wipe with IPA is recommended to remove static-attracted particles.
B2B Procurement Guide
Key specifications to confirm include thickness tolerance (±5% is standard), roll length (typically 50-500m), and surface treatment (adhesive primers, corona treatment). For electrical applications, request volume resistivity (>1×10^16 Ω·cm) and dielectric strength (>100 kV/mm) certifications. Lead times vary from 2-12 weeks depending on customization. Major manufacturers include DuPont (Kapton®), UBE Industries (Upilex®), and Kaneka (Apical®). For cost-sensitive projects, Chinese suppliers like Shengyi Technology offer competitive options but verify quality certifications (UL, RoHS). MOQs often start at 50kg or 100m².
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