Solubilities of Tris(o-phenylenedioxy)cyclotriphosphazene in Selected Solvents

Abstract

Tris-(o-phenylenedioxy)-cyclotriphosphazene (TPP) was synthesized and characterized by elemental analysis (EA) and nuclear magnetic resonance (NMR). The melting point and the enthalpy of fusion of TPP were measured by da ifferential scanning calorimeter (DSC), and the thermal stability of TPP was measured by thermogravimetric analysis (TGA). Using a static analytical method, the solubility data of TPP in nine solvents were measured and correlated with an empirical equation. Moreover, using the ScatchardÀHildebrand model, activity coefficients have also been calculated and compared with the experimental values. The partial molar excess enthalpies at infinite dilution were also predicted. ' INTRODUCTIONCyclophosphazene has a cycle structure comprised of nitrogen and phosphorus atoms. Many studies of flame retardants have focused attention on these atoms. The flame retardants reported in many papers have these heteroatoms. 1,2 Hence, the phosphazene structure has good flame retardant properties, and cyclophosphazene compounds could be used as flame retardants. 3,4 Tris-(o-phenylenedioxy)-cyclotriphosphazene (hereafter abbreviated as TPP; its formula is shown in Scheme 1) (CAS RN 311-03-5) is a cyclophosphazene derivative and could be used as a nonhalogen flame retardant for acrylonitrile butadiene styrene (ABS) 5 and poly(butylene terephthalate) (PBT). 6 Moreover, TPP can be used as building blocks for preparation of assembled materials. 7 As a result of its unique features, organic zeolites and molecular self-assembled materials seem to constitute a competing alternative for strategic industrial and environmental applications such as gas storage, selective gas recognition, and separation, where absorption properties of materials are emerging at the forefront of present-day research. 8À10 For example, TPP nanochannels show a strong affinity for including simple-shaped gas molecular and aliphatic or aromatic molecules. 11À13 The onedimensional arrangement of functional molecules using the TPP nanochannel is particularly interesting from the point of view of developing new molecular devices. 14 TPP can be prepared according to the literature. 15 In the industrial process and design, knowledge of solubilities of these compounds in different solvents is very important for their preparation and purification. To the best of our knowledge, the solubilities of TPP in selected solvents have not been reported in the literature.In this study, TPP was synthesized and characterized. The solubilities of TPP in ethanol, ethyl acetate, acetone, dichlormethane, tetrahydrofuran (THF), acetonitrile, toluene, chloroform, and 1,2-dichlorethane were also measured.

Supramolecular Hexagonal Platelet Assemblies with Uniform and Precisely-Controlled Dimensions

“…Hexagonal platelets were prepared from triblock copolymer PPO 14 -b-PEO 25 -b-PPO 14 (P-E-P, Figure 1c) and TPP, which was synthesized according to literature. 15 By simply heating the P-E-P/TPP mixture (EO/TPP = 1.3:1, molar ratio) in toluene at 80 °C for 1 h and cooling to 20 °C naturally within 2 h, the PEO block forms host−guest inclusion crystals, while the PPO block remains soluble in solvent and thus provides sufficient colloidal stability for the platelets, as elucidated by the molecular packing in Figure 1c. Owing to the higher mass density of the densely packed inclusion complex crystals, the platelets were clearly visible, while the short PPO chains were almost invisible under transmission electron microscopy (TEM, Figure 1d).…”