Sulfonated polyetheretherketone/polypropylene polymer blends for the production of photoactive materials

Abstract

Sulfonated polyetheretherketone (SPEEK) was synthesized via a mono-substitution reaction of PEEK in concentrated sulphuric\ud acid and was blended with polypropylene (PP) in 2–10%w/w concentration to be used for the production of photoactive thermoplastic\ud products. SPEEK and SPEEK/PP blends were characterized using FTIR, DSC, TGA, NMR, rheology, SEM, and EPR. Under\ud UV-Vis irradiation, stable benzophenone ketyl (BPK) radicals were generated by hydrogen extraction from PP. By increasing the\ud amount of SPEEK in the polymer blend a linear increase in the BPK radicals was achieved according to the EPR data. DSC and TGA\ud tests indicated weaknesses in the thermal stability of SPEEK but according to the rheological tests this should not have a major effect\ud on processabililty. The optimal amount of SPEEK in the blend was obtained at 5%w/w. This concentration provided a good compromise\ud between radical concentration, material processability, and cost

Fabrication and characterization of PEKK nanocomposites: An in vitro study

“…Bands at 1648 m −1 are connected to the ketone linkage’s C=O group. 5,36 PEKK crystallinity after compression molding was reported at 1305 cm −1 , 1272 cm −1 , 985 cm −1 , and 920 cm −15,37…”

“…Bands at 1648 m À1 are connected to the ketone linkage's C=O group. 5,36 PEKK crystallinity after compression molding was reported at 1305 cm À1 , 1272 cm À1 , 985 cm À1 , and 920 cm À15, 37 The IR absorption band in the range of 850-1100 cm À1 represented by peaks at 856 cm À1 , 876 cm À1 , 954 cm À1 , and 1063 cm À1 correspond to antisymmetric stretching of Si-O-Si bonds as well as asymmetric and symmetric stretching of Si-O terminal bonds. 38,39 The peak at 700 cm À1 represents the symmetric stretching of Si-O-Si bonds while the peaks at 448 cm À1 and 542 cm À1 represent CaO stretching vibration.…”

Fabrication and characterization of bioactive composite: A pilot study

“…12,43,44 Additionally, the crystallinity of PEKK after compression molding was reported as C-H out-of-plane bending substitution patterns observed at 1305, 1272, 985, and 920 cm −1 , where the intensity and width of the bending bands increased, which is consistent with the increased polymerization and structural order. 45…”

“…12,43,44 Additionally, the crystallinity of PEKK after compression molding was reported as C-H out-ofplane bending substitution patterns observed at 1305, 1272, 985, and 920 cm À1 , where the intensity and width of the bending bands increased, which is consistent with the increased polymerization and structural order. 45 In living systems, all bioactive substances form an apatite layer that resembles bone on their surfaces and can bind to the bone through this layer. 46 The surface of pure PEKK indicated no changes in the current investigation, whereas all the other experimental m-CS/PEKK composites induced HAp on their surfaces after being submerged in the SBF.…”