Experimental correlation of rheological relaxation and interface healing times in welding thermoplastic PEKK composites

The evolution of polymer welding time to join the interface thermoplastic Polyetherketoneketone (PEKK) matrix composites was characterized. Using a creep-recovery test protocol analyse rheological behavior, it shown that for temperatures above melting point (T>360°C), visco-elastic relaxation increases exponentially with time–indicating crosslinking or branching. To confirm is proportional healing time, results were compared fracture energy release rate (G1c) samples prepared on custom bench which capable isothermally weld composite controlled intervals. corresponds directly time. Furthermore, thermal history experienced in cross linking and influences implication temperature exposure from prior processing steps (IR oven pre-heating autoclave consolidation) can limit ability components predictable way.