Thermal and Crystallization Properties of the Alternated Tere/Iso PEKK Copolymer: Importance in High-Temperature Laser Sintering

High-temperature laser sintering (HT-LS) is a very promising additive manufacturing process for the production of parts complex geometry highly demanding applications. Poly(aryl ether ketone) polymers such as poly(ether ketone), and ketone (PEKK) have attracted increasing interest during last decade use in HT-LS. Among them, PEKK offers advantage exhibiting tunable melting temperature crystallization rate due to its copolymer structure. Indeed, synthesized by Friedel–Crafts polyacylation condensation diphenyl with terephthaloyl chloride (T units) isophthaloyl (I units). In this work, we focus on specific member family having regular alternated T/I structure, 50/50, study isothermal from melt at various temperatures (TC), 200 °C 290 °C. A quantitative analysis based X-ray scattering differential scanning calorimetry experiments performed. Primary dominates half-time higher than 6 min an Avrami exponent between 2.2 3. Stacks periodic crystalline lamellae are first created, followed lateral growth these lamellae, leading gradual increase weight crystallinity. Crystalline form I, traces III, mostly observed regardless TC. The amount perfection phase state achieved, well thermal rheological behavior 50/50 high TC (∼280–290 °C), HT-LS manufacturing.