Ether-substituted polymers

Other Routes. Substituted PPV derivatives have also been prepared by several other routes. In cases where the resulting polymers are soluble, these methods are often successful in preparing high molecular weight material. The Gilch route has been used to prepare phenyl and crown ether substituted polymers... 

As has been observed for crown ether-substituted polythiophenes [260, 261], the aza crown ether-substituted polymer poly(18) exhibited a cation-selective electrochemical response with an an-... 

The bulk polycondensation of (10) is normally carried out in evacuated, sealed vessels such as glass ampules or stainless steel Parr reactors, at temperatures between 160 and 220°C for 2—12 d (67). Two monomers with different substituents on each can be cocondensed to yield random copolymers. The by-product sdyl ether is readily removed under reduced pressure, and the polymer purified by precipitation from appropriate solvents. Catalysis of the polycondensation of (10) by phenoxide ion in particular, as well as by other species, has been reported to bring about complete polymerisation in 24—48 h at 150°C (68). Catalysis of the polycondensation of phosphoranimines that are similar to (10), but which yield P—O-substituted polymers (1), has also been described and appears promising for the synthesis of (1) with controlled stmctures (69,70). 

The first alkyl side-chain ether-substituted polysilane to be prepared was 40, with a single oxygen atom in one of the side chains. The polymer is soluble in alcohols, including methanol, in addition to common non-polar organic solvents.144 145... 

While this work has focused on certain allylic and benzylic ether derivatives of poly(4-hydroxystyrene) it is possible to extend the concept to the corresponding t-butoxy substituted polymers although the preparation of such polymers is relatively more difficult than in the present case. 

TEVES has been used to treat soils contaminated with laboratory-generated organic wastes including alcohols, aldehydes, amines, ketones, benzene and substituted benzenes, ethers, phenols, polymers, and heterocyclic compounds. The largest volume of organic wastes treated were volatile organic compounds (VOCs) and various types of oils (hydraulic, transformer, heat transfer fluid, and motor oils). 

The ability of fluoro-2 -phosphanes to transform silyl ethers into fluorides was first observed during a study of the reactions of phosphorus pentafluoride and its derivatives R PF5 (n = 1, 2, 3 R = hydrocarbon group) with trimethylsilyl ethers. Subsequently, this reaction was proposed as a new method for the preparation of C-F compounds from silyl ethers or silicic acid esters with fluoro-A -phosphanes. Pentafluorophenyl-substituted fluoro-A -phos-phanes were found to react similarily, Other workers found that tctrafluoro(phenyl)-A -phos-phane. which was chosen as the most convenient reagent with regard to reactivity and stability, gave considerable amounts of elimination products, especially with primary and cyclic alcohols. Good yields of fluorinated products are obtained when stable carbocations can be formed at the site of substitution, such as in tertiary alcohols, but 2-phcnylethanol. benzyl alcohol and diphcnylmethanol, on the other hand, give only poor yields of fluorinated products ethers and polymers are the main products. ... 

Chang-Chien, G., Terminally carboxyl oligo(ethylene oxide) monomethyl ether-substituted side chain liquid crystalline polysiloxane polymer as stationary phase in capillary gas chromatography for the separation of polynuclear aromatic hydrocarbons, J. Chromatogr. A, 808, 201-209, 1998. 

G. Ramachandian, G. Simon, Y. Cheng, and L. Dai. Control of fluorescence emission color of benzo 15-crown-5 ether substituted oUgo phenylene vinylene-ceramic nanocomposites. Polymer, 46(18) 7176-7184, August 2005. 

Hall, D.M., Home, J.R., 1973, Model compounds of cellulose trityl ethers substituted exclusively at C-6 primary hydroxyls. J. Appl. Polym. Sci. 17 2891-28%. 

On the other hand, oxyalkyl-substituted polymers are also potentially attractive for the known cation coordinating properties of their ether groups, which are expected to improve ionic transport in the polymers and, hence, to give faster electrochromic response time. The ether-group compatibility of these polymers with polyethylenoxide-based polymer electrolytes is also expected to improve the electrode-electrolyte contact in solid-state electrochromic devices. 

Although its difluoramination chemistry is straightforward, a relatively recent preparation of an NF2-substituted polymer (a binder ingredient candidate) was reported by Jiang et al. (Hubei Redstar Chemical Institute, China) [99]. 4,4-Bis(difluoramino)pentyl glycidyl ether polymer was prepared by reaction of 4,4-bis(difluoramino)pentanol with epichlorohydrin followed by homopolymerization of the resiflting oxirane ether monomer (Scheme 10) or copolymerization with THE... 

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