Characterization of 2‐(2‐methoxyethoxy)ethanol‐substituted phosphazene polymers using pervaporation, solubility parameters, and sorption studies

Abstract

Two linear phosphazene polymers were synthesized with differing amounts of hydrophilic 2-(2-methoxyethoxy)ethanol (MEE) and hydrophobic 4-methoxyphenol (MEOP) substituted on the backbone. These high polymers were cast into membranes and their permeability to water, methanol, ethanol, and 2-propanol was evaluated as a function of temperature. An additional polymer with a low content of MEE was studied for water permeation and was characterized by trace flux. At higher levels of MEE on the backbone, fluxes of all solvents increased. Solubility also was found to increase with increasing MEE content for all solvents except water. Unexpectedly, water was found to be less soluble in the higher MEE polymer, although higher membrane fluxes were observed. Diffusion coefficients showed the following trend: methanol Ͼ Ͼ 2-propanol Ͼ ethanol Ͼ Ͼ water. Finally, the affinity of solvents and polymers was discussed in terms of Hansen solubility parameters.

Synthesis, characterization, thermal properties and flame retardancy of a novel nonflammable phosphazene-based epoxy resin

“…First, the flexible synthetic methodology can be developed for preparation of cyclotriphosphazene-based copolymer with various substituents, which allows us to obtain multifunctional initiators or terminators with ease. Second, thermal and nonflammable properties of the cyclotriphosphazene moieties can be conferred to the resulting polymers, especially, of low molecular weights [12,13,[18][19][20]. Therefore, when cyclotriphosphazenes are incorporated into the network of thermoset polymers, they can increase the thermal property and flame retardancy of the polymers because of phosphorous and nitrogen flame-retardant synergy.…”

“…In recent years, there has been considerable interest in the phosphazene-based family of materials because they not only have a wide range of thermal and chemical stabilities, but also can provide improved thermal and flame-retardant properties to polymers and their composites [10][11][12][13][14][15]. Hexachlorocyclotriphosphazene is a versatile starting oligomer for the synthesis of phosphazene-based polymers.…”

Solution and diffusion properties of organic sulfur in poly[bis(phenoxy)phosphazene] by inverse gas chromatography

“…46 Polyphosphazenes (POPs), which are polymers with phospho-47 rus and nitrogen backbone and organic side groups. The chemical 48 and physical properties of POPs could be easily tailored by the 49 incorporation of various pendant groups [7][8][9][10][11]. In our previous 50 work, poly[bis(phenoxy)phosphazene] (PBPP) was synthesized 51 and investigated as pervaporation desulfurization membrane 52 material.…”

Evaluation of model compounds–polypropylene film interactions by Fourier transformed infrared spectroscopy (FTIR) method

“…14,15 Other authors also observed an increase in sorption with an increase in molecular weight of sorbing compounds. 16,17 The size and shape of the sorbant could affect and influence its sorption into and through the polymer matrix. These investigations concluded that the extent of sorption was dependent on temperature and polymer type, as well as carbon chain length and type of functional group of sorbate.…”