Synthesis and characterization of polymers with pendent phosphonate groups

Abstract

SynopsisSoluble chloromethylated polystyrene and its copolymers with vinylidene chloride as well as poly(pheny1 oxides) brominated in the side chains and in the ring were synthesized and characterized in detail by NMR. The halogenated polymers were phosphonylated with alkyl phosphites. Uncrosslinked polymers with pendent phosphonate groups were prepared in the presence of etheral solvents, which solvate the ionic intermediates of the Arbuzov reaction. These polyphosphonates are highly hygroscopic and are soluble in a variety of solvents. Their 2';s are in the range of 50-175OC. Their thermal behavior was analyzed on the basis of thermogravimetric measurements combined with mass-spectrometric analysis. Poly(styrene phosphonate) seems to be the most stable, and its thermal decomposition starts at -330°C. The polymeric phosphonates are compatible with an unusually large number of polymeric systems and seem to form "true" polymeric alloys with acetylcellulose.

Synthesis and Characterization of Polyimides with Pendant Phosphonate Ester Groups

“…13 However, the brominated BPDA-TrMPD polyimides were insoluble in diethyl carbitol. Several solvents were tested.…”

“…Young's modulus E' increased suddenly at about 570 K. This is probably due to a crosslinked network formed simultaneously with the decomposition of the ethyl ester group. 13 Polyimides have three different relaxations labeled x, /3. and y in the order of decreasing temperature.…”

Synthesis of poly(phosphonosiloxane) and its cyclic monomer via hydrosilylation and phosphonylation of vinylbenzyl chloride

“…This was achieved in two stages: substituting methylhydrogen siloxane with vinylbenzyl chloride (VBC) to form a stable silicon-carbon bond, followed by phosphorylation via the Arbuzov reaction. 1,4 The hydrosilylation results in modest redistribution, 16,17 and the SiOC bond is stable in acidic or basic environments. 18 Hydrosilylation with VBC served as a vehicle and key step to the syntheses of the siloxane phosphonates; therefore, this reaction was further studied and is reported here.…”

“…Most of the reported syntheses successfully avoided crosslinking in the effective phosphonylation of some conventional polymers [e.g., polystyrene, 4 polyphenylene oxide, 5 poly(vinyl alcohol), 8 and polyacrylate 9,10 ]. The diverse properties that can be accorded to a macromolecule by full or partial phosphonylation was the impetus for synthesis of phosphonylated polysiloxane.…”

Blend Membranes of Sodium Alginate/Poly(Styrene Sulfonic Acid) for Isopropanol Dehydration

“…Transport across the PV membrane occurs due to sorption and diffusion of liquids; however, evaporation occurs from the downstream side [5]. Among the many polymers used as membranes, polymer blends are attractive, since these could offer increased flux and selectivity over the homo-polymeric membranes [6][7][8]. Even though NaAlg has been widely used as a PV membrane, due to its drawbacks like water-soluble property and mechanical weakness [9], blends, grafts and filled composite membranes of NaAlg have been attempted [2,[10][11][12][13].…”