Polymer polyfethylene oxide

Polymers such as polyfvinyl alcohol), dextrans, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, and polyfethylene oxide) can be used as dynamic or permanent coatings. The latter mode is generally more effective. 

Poly(ethylene glycol) (PEG) is extensively used as a soluble polymer support. It is a low molecular weight polyfethylene oxide) with hydroxyl groups at both chain ends. The terminal hydoxyl groups allow for attachment of a wide range of other functional groups that... 

Mukae, K., Bae, Y.H., Okano, T. et al. 1990a. A new thermosensitive hydrogel Polyfethylene oxide-dimethylsiloxane-ethylene oxide)/poly(N-isopropylacrylamide) interpenetrating polymer networks, n. On-off regulation of solute release. Polym 7. 22 250-265. 

In surface emulsion treaters (e.g. oil-water separators), the occurrence of foams is generally undesirable and any such foams will have to be broken, either downhole or at the surface [12, 15). Oilfield-produced water may also foam, which can also cause problems in handling and in gas separation. This is usually dealt with by adding antifoaming or defoaming chemicals such as silicones, polyglycol esters or polymers such as polyfethylene oxide)—polyfpropylene oxide) block copolymers. 

Chandrasekaran, R., SeUadurai, S., 2001. Study of a new polymer electrolyte polyfethylene oxide) NaC103 with several plasticizers for battery application. Polym. Int. 50, 89-94. 

Figure 9.10 (a) Normalised velocity profiles for different concentration solutions of polyfethylene oxide) in water obtained using dynamic NMR microscopy. The concentrations increase in equal steps from 0.5% (w/v) ( ) to 4.5% (w/v) ( ). (b) The polymer self-diffusion profile for the highest concentration solution in units of 10 m s" Note that this was obtained in a separate experiment so that the capillary wall does not fall at precisely the same pixel as in (a), (c) Water solvent velocity and (d) diffusion maps for the 4.5% (w/v) poly(ethylene oxide) solution. (From Y. Xia and P.T. Callaghan [18] and reproduced by permission of the American Chemical Society.)... 

The second approach for improving the processabihty of ICPs is to prepare their colloidal dispersions in water or an appropriate solvent The colloid dispersions of ICPs can be obtained by chemical or electrochemical oxidation of the monomer in the presence of a steric stabihzer [29-31].The key parameter for such synthesis is the choice of an appropriate steric stabihzer which adsorbs or grafts onto the polymer coUoidal particles to prevent their aggregation or precipitation. Several polymers such as polyfethylene oxide) [32], poly(vinyl pyrroHdone) [33,34], poly(vinyl alcohol) [35], ethyl hydroxy cellulose [36], poly(vinyl alcohol-co-acetate) [37], poly(vinyl methyl ether) [38,39] and block copolymer stabihzer [40] have been used as steric stabihzers to produce PPy coUoidal dispersions. Surfactants are also employed for the synthesis of ICP coUoidal dispersions [41,42]. Very recently, stable PPy dispersions were prepared by Lu et al. by polymerizing pyrrole in an aqueous medium containing different anionic salts such as sodium benzoate, potassium hydrogen phthalate, and sodium succinate [43]. These authors also reported that the conductivity of PPy dispersions was enhanced when sodium benzoate was used as dopant. Chemical oxidahve polymerization in the presence of PSS in aqueous medium produces coUoidal dispersions and improves processability [44]. CoUoidal dispersions... 

Figure 1. Temperature variation of the conductivity for a cros,s-section of polymer electrolytes. PESc, poly (ethylene succinate) PEO, polyfethylene oxide) PPO, polytpropylene oxide) PEI, polyfethyleneimine) MEEP, poly(methoxyethoxy-ethoxyphosphazene) PEO, amorphous meihoxy-linked PEO PAN, polyacrylonitrile PC, propylene carbonate EC, ethylene carbonate.

Wang D-A, Ji J, Sun Y-H, Shen J-C, Feng L-X, EUsseeff JH. In situ immobilization of proteins and RGD peptide on polyurethane surfaces via polyfethylene oxide) coupling polymers for human endothelial cell growth. Biomacromolecules 2002 3 1286-95. 

Chen, D., et al. Morphology and biodegradation of microspheres of polyester-polyether block copolymer based on polycaprolactone/polylactide/ polyfethylene oxide). Polymer International, 49(3) p. 269. 2000. 

Pepic,D.,effl/.,Synthesisandcharacterizationofbiodegradablealiphaticcopoly-esters with polyfethylene oxide) soft segments. European Polymer Journal, 44(3) p. 904. 2008. 

Botelho, G., A. Queirds, and P. Gijsman, Thermooxidative studies of polyfether-esters) 1. Copolymer of poly(butylene terephthalate) and polyfethylene oxide). Polymer Degradation and Stability, 67(1) p. 13. 2000. 

The resulting polymer is called polyfethylene oxide) or polyfethylene glycol). It is sold under the trade name Carbowax and is as an adhesive and a thickening agent. 

Samad et al. developed a novel solid polymer electrolyte (SPE) based on polyfethylene oxide) (PEO) and CNCs by solvent-casting method for moderate temperature applications within the range 50-100°C. The effect of different amormts of CNCs was observed on strength, thermal, and electrochemical stability. On addition of 15% CNCs in SPE, about a five-times increase in tensile and storage modulus was measured. The effect of temperature on PEO and CNCs interaction while drying is demonstrated in Figure 15.13. 

Kweon, J. O., and Noh, S. T. 2001. Thermal, thennomechanical, and electrochemical characterization of the organic-inorganic hybrids polyfethylene oxide) (PEO)-silica and PEO-Silica-LiC104. JAppl Polym Sci 81 2471-80. 

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