A novel cross-linkable poly(ether ether ketone ketone) alternating copolymer was synthesized by introducing thio-ether moiety to PEEKK rigid main chain. The copolymer can be processed at 628 K and be cross-linked by annealing at 653 K for 5 h. The cross-linking reaction was caused by the introduced thio-ether moiety instead of the PEEKK moiety. The cross-linked material has better mechanical properties and thermal stability that uncross-liked one. The results will give proof to the further research on controllable cross-linking PEEKK. This material is anticipated to be processed as a thermoplastic material as well as used a as thermosetting material after being cross-linked. [WT5HZ]
A novel controllable cross-linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, which was combined with merits of thermoplastic material and thermosetting material because it can be processed as a thermoplastic material before cross-linking and be applied as a thermosetting material after being crosslinked by electron beam and heat cross-linking reaction. In this paper, we mainly discussed the rheological behavior of controllable cross-linking PEEK at a dynamic time and 653 K. The variation of modulus and complex viscosity and rheological regularity of the materials with different molecular weights were investigated by tracking and monitoring process of cross-linking reaction using retary rheometer. The relationship between structures and properties of controllable cross-linking PEEK was explored.
