Poly Polyethylene oxide

Occasionally, water-soluble plastics are required. Poly(vinyl alcohol) is commonly the first to be considered but some cellulose ethers, polyethylene oxides, poly(vinyl pyrrolidone) and A-substituted polyamides are among many possible alternatives. 

A related class of gels are those formed by extensive hydrogen bonding. An example is the polyethylene oxide)-poly(methacrylic acid) complex [18]. Spontaneously gelling natural polymer solutions are frequently of this type, including gelatin and native starch. 

Goh HW, Goh SH, Xu GQ, Lee KY, Yang GY, Lee YW, Zhang WD (2003). Optical limiting properties of double-C60-end-capped poly(ethylene oxide), double-C -end-capped polyethylene oxide)/poly(ethylene oxide) blend, and double-C -end-capped poly(ethylene oxide)/multiwalled carbon nanotube composite. J. Phys. Chem. B 107 6056-6062. 

X.D. Huang, S.H. Goh, Interpolymer complexes through hydrophobic interactions C60-end-capped polyethylene oxide)/poly(methacrylic acid) complexes, Macromolecules, pp. 8894-8897, 2000. 

As stated in the introductory chapter, water-soluble polymers, such as polyethylene oxide), poly(AT-vinylpyrrolidone), polyacrylamide, poly(vinyl alcohol), dextrans etc., have been believed to be inert to any of the biological elements. In fact, a number of trials have been carried out to improve the biocompatibility of polymeric materials by conjugating water soluble polymers,... 

Polyethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) (Pluronic) block copolymer is a very efficient reducing agent and nanoparticle stabilizer. Au NPs of about 10 nm can be stabilized with PEO-PPO-PEO block copolymer solutions in water and at room temperature and using HAuC14 as precursor. The formation of gold nanoparticles is controlled by the overall molecular weight and relative block length of the block copolymer [118]. 

Alexandridis P, Hatton TA. Polyethylene oxide)-poly(propylene oxide)- poly(ethylene oxide) block copolymer surfactants in aqueous solutions and at interfaces thermodynamics, structure, dynamics, and modeling (review). Colloid Surf A Physicochem Eng Aspects 1995 96 1 16. 

Crystallization in asymmetric diblocks with compositions = 0.35 and 0.46 was also investigated by Hamley et al. (19966). It was found that a lamellar structure melted epitaxially (i.e. the domain spacing and orientation were maintained across the transition) to a hexagonal-packed cylinder structure in the /PE = 0.35 sample. This is illustrated in Fig. 5.15, which shows SAXS patterns in the solid and melt states, with a schematic of the epitaxial melting process (Hamley et al. 1996a.b). The same epitaxial transition has been observed for a polyethylene oxide)-poly(buty)ene oxide) diblock (Ryan et at. 1997) vide infra). 

Poly (ethylene oxide)/poly (butylene oxide) copolymers In polyethylene oxide)-poly(butylene oxide) (PEO-PBO) diblocks with short blocks, unfolded PEO blocks crystallize into lamellar crystals, and the PBO... 

Almgren. M., J. Van Stam, C. Lindblad, P. Stilbs, and P. Bahadur. 1991. Aggregation of polyethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers in the presence of sodium dodecyl sulfate in aqueous solutiod.. Phys. Chem. 95 5677-5684. 

La, S. B., T. Okano, and K. Kataoka. 1996. Preparation and characterization of the micelle-forming polymeric drug indomethacin-incorporated polyethylene oxide)-poly(-bana Dartate) block copolymer micelles.J. Pharm. Sci85 85-90. 

J. Zawada, C. Ylitalo, G. Fuller, R. Colby, and T. Long, Component relaxation dynamics in a miscible polymer blend Polyethylene oxide)/poly(methyl methacrylate), Macromolecules, 25,2896 (1992). 

DBU DMC DMF EC EO EOS GSS ILs MBMTBP MEA MW PC PDMS PEG PEGda PEO PMPS PO PPG PPGda PTC PTHF PTMO PVP Diazabicyclo[5.4.0] -undec-7-ene Dimethylcarbonate Dimethylform amide Ethylene carbonate Ethylene oxide, oxyethylene Equation of state Gas-saturated solution Ionic liquids 2,2,-methylene-bis(4-methyl-6-tert-butylphenol) Monoethanolamine Molecular weight Propylene carbonate Polydimethylsiloxane Polyethylene glycol Poly(ethylene glycol) diacrylate Polyethylene oxide Poly(methylphenylsiloxane) Propylene oxide Poly(propylene glycol) Poly(propylene glycol) diacrylate Phase-transfer catalyst Poly(tetrahydrofuran) Polytetramethylene oxide Polyvinyl pyrrolidone... 

Polyethylene glycol Polyethylene oxide Poly(dimethyl silicone)... 

Graft copolymers of poloxamers and either poly(acrylic acid) or chitosan change from a sol to a gel at temperature above 37 °C. The appearing gel forms a stable matrix that can retain a drag for its sustained release. The triblock copolymer consisting of polyethylene oxide)-poly(/-lactide)-poly(ethylene oxide) (PEO-PLLA-PEO) is also temperature-sensitive but shows an opposite gellation property. At low... 

Polyethylene oxide)—poly(/-lacride)b block copolymer biodegradable/bioerodible... 

Polyethylene Oxide)-poly(L-lactic acid)/Poly( 3-benzyl-L-aspartate) 56... 

SBA-15 is prepared under acidic conditions using polyethylene oxide)-poly(propylenc oxide)-poly(elhylene oxide) triblock copolymers, (EO)n(PO)7o(EO)n, as templates, e.g. Pluronic P123 (n = 20), Pluronic L121 (n - 5) or Pluronic F127 (n = 106). In a typical synthesis [54,551 based on the original procedures [33], 4.0 g of (EO)2o(PO)7o(EO)2o copolymer was dissolved in 150 g of 1.6 M HC1. To this solution was added 8.50 g of TEOS, and the resulting mixture was stirred until TEOS was dissolved. The mixture was heated in an oven for 24 h at 308 K. and then 24 h more at 373 K. under static condition. Silica products were filtered, dried (without washing), and calcined at 823 K. 

In most cases the catalytically active metal complex moiety is attached to a polymer carrying tertiary phosphine units. Such phosphinated polymers can be prepared from well-known water soluble polymers such as poly(ethyleneimine), poly(acrylic acid) [90,91] or polyethers [92] (see also Chapter 2). The solubility of these catalysts is often pH-dependent [90,91,93] so they can be separated from the reaction mixture by proper manipulation of the pH. Some polymers, such as the polyethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers, have inverse temperature dependent solubility in water and retain this property after functionalization with PPh2 and subsequent complexation with rhodium(I). The effect of temperature was demonstrated in the hydrogenation of aqueous allyl alcohol, which proceeded rapidly at 0 °C but stopped completely at 40 °C at which temperature the catalyst precipitated hydrogenation resumed by cooling the solution to 0 °C [92], Such smart catalysts may have special value in regulating the rate of strongly exothermic catalytic reactions. 

JIA Jiang, S., An, L., Jiang, B, and Wolf, B.A., Liquid-liquid phase behavior of toluene/ polyethylene oxide/poly(ethylene oxide-i-dimethylsiloxane) polymer-containing ternary mixtures (exp. data by S. Jiang), Phys. Chem. Chem. Phys., 5, 2066, 2003. 

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