Polyethylene-propylene glycol copolymer

Lutrol Monolan Pluronic poloxalkol polyethylene-propylene glycol copolymer polyoxyethylene-polyoxypropylene copolymer Supronic Synperonic. 

Recently a CD-insulin complex was encapsulated in polymethacrylic acid-chi-tosan-polyether[polyethylene glycol (PEG)-propylene glycol] copolymer PMCP nanoparticles from the free-radical polymerization of methacrylic acid in the presence of chitosan and polyether in a medium free of solvents or surfactants. Particles had a size distribution of 500-800 nm. The HP-B-CD inclusion complex with insulin was encapsulated into the nanoparticles, resulting in a pH-dependent release profile as seen in Figure 2. The biological activity of insulin was demonstrated with enzyme-... 

Several recent patents describe the benefits of polymers in LDLDs (Table 7.15). Polymers are well known to interact with surfactants and provide many interesting properties. Some of the benefits claimed in the patents summarized in Table 7.15 are soil resistance due to amino acid copolymers, polyethylene glycol as a grease release agent, increased grease removal from polyoxyethylene diamine, enhanced foam volume and duration, increased solubility, and enhanced mildness by ethylene oxide-propylene oxide copolymers. As described in these various patents, the addition of polymers to LDLDs can aid performance in many important attributes of the product. 

Polydimethylsiloxane, hydroxyethoxypropyl-terminated Polydimethylsiloxane, trimethylsiloxy-terminated Polyethylene Polyethylene wax Polyglyceryl-2 isostearate Polymethyl-3,3,3-trifluoropropylsiloxane Potassium caprate PPG-40 Propylene glycol dimethyl ether Propylene glycol laurate Propylene glycol stearate Pyridine Pyridinium propyl sulfobetaine (N-Pyrrolidonepropyl) methylsiloxane-dimethylsiloxane copolymer Silicone... 

C02-assisted viscosity reduction has been observed for the following polymer systems PMMA [82], polypropylene [82], poly(vinylidene fluoride) [82], poly(di-methylsUoxane) [1, 85, 87, 90, 91], poly(ethylene glycol) [92-96], poly(ethylene glycol) nonphenyl ether [97], acronitrile copolymer (65 wt% AN) [89], polyamide 11 [48], low-density polyethylene (LDPE) [82, 98], poly(propylene glycol) and suspensions of fumed sihca in poly(propylene glycol) [86], polystyrene [80, 81, 99], binary mixtures of polystyrene and toluene [84, 100, 101], and biomaterials [101]. Viscosity reduction has also been observed for the following blends polyethylene and polystyrene [79, 102], polystyrene and PMMA [103], PMMA/rabber and polystyrene/rubber [104]. 

The base polymer for this t5q>e of sealant exists in the form of an emulsion of micron- and submicron-sized partides of the polymer suspended in water. The base polymer formed by free radical polymerization may be a homopolymer of an acrylic monomer but is more likely to be a copolymer of a number of different monomers chosen to provide the correct balance of properties. The polymer latex has to be made more permanent and therefore a nonionic surfactant such as a nonyl phenol/ polyethylene oxide is added to help stabilize the emulsion. Other additives to the sealant formulation include plastid-zers, fillers, solvents, and silanes. A plasticizer is added to the formulation in order to improve upon or maintain the flexibility of the sealant. Solvents (usually a small amount) are added to improve the tooling of the sealant after it is applied. In addition, a solvent could be a material such as ethylene or propylene glycol which can improve the resistance of the packaged sealant to temperatures below freezing. The most widely used filler for this type of sealant is calcium carbonate. Silanes are often added to acrylics to improve the wet adhesion of the sealant to glass. Other additives include antimildew agents (for tub and tile applications) and clay for rheological control. 

Segmented Copolymers between Oligo(1,3-Propylene Succinate)s and Polyethylene Glycol)... 

Polyethylene Glycol (PEG), Polyethylene Oxide (PEO), and Block Copolymers of Ethylene Oxide and Propylene Oxide (PEOPO)... 

Other important examples of ring-opening polymerizations are the synthesis of polyethylene oxide and the block copolymer of ethylene oxide and propylene oxide. Polyethylene oxide, also known as polyethylene glycol (PEG), is commonly produced by anionic polymerization and has a low molecular weight of less than 20,000. 

Poly(ethylene glycol) is used in a number of copolymers, such as poly(propylene oxide-co-ethylene oxide), polyethylene-ft/oc/c-poly(ethylene glycol), poly [2,2-propanebis(4-phenyl)carbonate-b/oc/c-poly(ethyIene oxide], as well as in various polymer blends. Several pyrolysis studies were done on these copolymers [9-11]. 

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