In this study mesoporous silica spheres (MPSs) and polyphosphoric acid based organophosphate ester flame retardant (FR material) material were synthesized and flame retardancy performance in acrylate-based polyurethanes (PUR) and polyester (PET) resins investigated. For this, both MPSs and FR material were synthesized according to literature and FR material was loaded into MPSs which takes the role of carrier. Loaded MPSs were put into UV curable PUR and PET resins and polymerized under UV radiation. Their characteristics were investigated by FT-IR, TGA, LOI, SEM and TEM. The results showed that FR material had excellent flame-retardant abilities for both PUR and PET series. The TGA curves suggested that synthesized FR material shows lower thermal stability at low temperatures than original materials however it showed good ability of char formation at higher temperatures, therefore improving the flame retardant property of samples. Moreover the LOI analysis showed that flame retardancy properties were improved significantly. The additive increased the LOI value from 20,5 and 21 to 26,5 and 27.

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The series of bis-cyclometalated iridium (III) complexes bearing different substituents (-H, -OCH3, -F, -CH3) at the aryl moiety (Ir-1, Ir-2, Ir-3 and Ir-4) have been synthesized and characterized by MASS and 1H NMR spectrometries, and IR, absorption and emission spectroscopies. The effects of the substituents on their oxygen sensing properties as well as optical properties and decay kinetics have been investigated systematically in tetrahydrofuran (THF) and ethyl cellulose (EC) thin films. The Ir (III) complexes embedded in EC-based thin films showed more advanced sensor dynamics, higher oxygen sensitivity, and superior relative signal changes when compared with their solution phase. The I0/I100 values of Ir-1, Ir-2, Ir-3 and Ir-4 immobilized in EC thin film were calculated as 11.3, 5.2, 7.0 and 25.6 for the concentration range of 0-100% pCO2, respectively. These results show that the weak electron-donating properties of the methyl groups at the aryl moiety improve remarkably the optical oxygen sensing abilities of the Ir (III) complexes.

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