Polypropylene Glycol Polyol

Adipic acid-ethylene glycol polyester polyol is also used in making foams, adhesives, coatings, and so on. 

Possibly another polyester polyol could be used in place of this specific polyester however, some of the polyurethane properties might be different. 

Polypropylene glycol polyol represents a typical polyether polyol. With the ether linkage, the polyurethanes made from this are generally more flexible at lower temperatures. Also, polyurethanes based on this type of polyol backbone are more resistant to hydrolysis attack by water (especially in alkaline solution) than polyurethanes with backbones of polyester. 

4-butanediol is used to synthesize polytetramethylene ether glycol, which is used in the production of polyurethane ether-type backbones. 

Preparation of propylene glycol Propylene Glycol by hydrolysis of propylene oxide 

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Materials Two commercial polypropylene glycols (polyols) of different functionality were used. The trifunctional polyol is Union Carbide NIAX 16-56, and the difunctional polyol is Union Carbide NIAX 2025. Each has an equivalent weight approximating 1.00 kg. The polyols were dried with bubbling dry nitrogen while... 

Chem. Descrip. Polypropylene glycol polyol Uses Polyol in prep, of one- and two-component PU foams, adhesives, coatings, elastomers, sealants... 

Chem. Descrip. Polypropylene glycol polyol Uses Polyol in moisture-cured urethane coatings and filled elastomers Properties R-Co 50 max. dear liq. m.w. 1000 sp.gr. 1.01 (20/20 C) vise. 76 cs (110 F) acid no. 0.1 max. hyd. no. 102-115 flash pt. (PMCC) 350 F pH 6-8 (10 6 IPA/water) 0.03% max. water Storage Store under dry, inert gas blanket such as nitrogen to minimize contamination from contact with air and water Jeffol PPG-2000 [Huntsman]... 

ME2 Medved, Z.N., Petrova, N.I., and Tarakanov, O.G., Thermodynamics of mixing of oligomeric polypropylene glycol polyols with water (Russ.), Vysokomol. Soedin., Ser. B, 25, 764, 1983. 

Chlorohydrin is used to produce propylene oxide, which is converted to propylene glycol, a feedstock for manufacturing polypropylene glycol (polyol) for polyurethane applications. 

Aliphatic Glycidyl Ethers. Aliphatic epoxy resins have been synthesized by glycidylation of difunctional or polyfunctional polyols such as a 1,4-butanediol, 2,2-dimethyl-l,3-propanediol (neopentyl glycol), polypropylene glycols, glycerol, trimethylolpropane, and pentaerythritol. 

Nonionic Surface-Active Agents. Approximately 14% of the ethylene oxide consumed in the United States is used in the manufacture of nonionic surfactants. These are derived by addition of ethylene oxide to fatty alcohols, alkylphenols (qv), tall oil, alkyl mercaptans, and various polyols such as polypropylene glycol), sorbitol, mannitol, and cellulose. They are used in household detergent formulations, industrial surfactant applications, in emulsion polymerization, textiles, paper manufacturing and recycling, and for many other applications (281). 

PPDI PPG Prepolymer Processability initiating agent. An abbreviation for paraphenylene diisocyanate. Polypropylene glycol. The product from reacting a polyol with an isocyanate. The relative ease with which a raw or compounded polymer can be handled. 

Long-chain polyether polyols, such as polypropylene glycol, when reacted with epichlorohydrin produce a diepoxy resin with an internal polyether chain that serves both to... 

Feng and Waldman used 4,4 -diphenylmethane diisocyanate. The polyol is either 2000 or 4000 molecular weight polypropylene glycol (PPG) and the catalyst is dibutylin dilaurate (DBTOL). The NOC-terminated urethane prepolymers are made in the usual way by reacting an excess of methane diisocyanate with PPG in the presence of DBTDL at an NCO OH ratio of 1.4 2.0. The reactions are run at 70°C for about 3 h to reach a constant percentage of NCO. 

Close to two-thirds of the propylene oxide produced goes to polypropylene glycol and polyester glycols production destined for use in polyurethanes. The polyol diols are made by the base-catalyzed reaction of propylene glycol... 

Polyether-polyols are produced by the poiyaddition of an epoxide (propylene or ethylene oxide) to an active hydrogen initiator (polyol, amine, add. water, etc.). Polypropylene glycol PPG) is obtained by the poiyaddition of propylene oxide to propylene glycol, used as an initiator ... 

Very efficient NAD (nonreactive from the point of view of radical polymerisation) are the very high molecular weight polyether polyols (e.g., a polypropylene glycol with a... 

Polyether polyols, especially polypropylene glycols, have lower functionality than is theoretically due to the presence of side reactions during synthesis (see details in... 

Chapter 12.5). Polyester polyols in reality, have the theoretical functionality, which is a great advantage for many polyurethane applications. For polyester diols the functionality is 2 OH groups/mol. This structural aspect results in the polyester diols giving PU elastomers with excellent physico-mechanical properties, superior to all polypropylene glycols obtained by anionic PO polymerisation. 

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