What are the advantages and challenges of thermoplastic matrix composites?

Thermoplastic composites use melt-processable matrices (PEEK, PEKK, PPS, PEI). Advantages: No refrigeration required for prepreg storage (indefinite out-life), Rapid processing (melt-consolidate in minutes vs hours for thermoset cure), Weldable (resistance, ultrasonic, induction) - reduces fasteners, Recyclable (can be remelted), Better damage tolerance (higher toughness), and Better chemical resistance. Challenges: High processing temperature (340-400C for PEEK), Requires high pressure for consolidation (autoclaves or presses), Limited drape compared to thermoset prepreg, Material cost higher than epoxy, and Less design database and experience. Applications: Secondary structure (brackets, clips, ribs), Pressure vessels (hydrogen storage), Fuselage skins (Gulfstream G650), and Welded assemblies. Processing: Press consolidation, automated tape/fiber placement with in-situ consolidation, and stamp forming. Certification requires equivalent building block approach. Growing adoption driven by rate and sustainability advantages.