Branched aliphatic polyethers

Ahad, E. (1989) Branched hydroxy terminated azido aliphatic polyethers. 

Schwab E, Mecking S (2005) Synthesis and properties of highly branched polycations with an aliphatic polyether scaffold. J Polym Sci A Polym Chem 43 4609-4617... 

Hyperbranched polymers are formed by polymerization of AB,-monomers as first theoretically discussed by Flory. A wide variety of hyperbranched polymer structures such as aromatic polyethers and polyesters, aliphatic polyesters. polyphenylenes, and aromatic polyamides have been described in the literature. The structure of hyperbranched polymers allows some defects, i.e. the degree of branching (DB) is less than one. The synthesis of hyperbranched polymers can often be simplified compared to the one of dendrimers since it is not necessary to use protection/deprotection steps. The most common synthetic route follows a one-pot procedure " where AB,-monomers are condensated in the presence of a catalyst. Another method using a core molecule and an AB,-monomer has been described. ... 

A variety of other materials including alkoxylated aliphatic acids, various polyethers, such as polyethylene glycols, branched polyvinylethers and polyalkoxyamines have been claimed to exhibit antifoam properties in lubricating oils. 

The poly(alkylene oxide)s are linear or branched-chain polymers that contain ether linkages in their main polymer chain structure and are derived from monomers that are vicinal cyclic oxides, or epoxides, of aliphatic olefins, principally ethylene and propylene and, to a much lesser extent, butylene. These polyethers are commercially produced over a range of molecular weights from a few hundred to several million for use as functional materials and as intermediates. Lower polymers are liquids, increasing in viscosity with molecular weight. The high polymers can be thermoplastic. Solubilities range from hydrophilic water-soluble polymers that are principally derived from ethylene oxide, to hydrophobic, oil-soluble polymers of propylene oxide and butylene oxide. A wide variety of copolymers is produced, both random copolymers and block copolymers. The latter may be used for their surface-active characteristics. 

Branched PEE [106,107] and ABA-type triblock copolymers [102] were also synthesized. Polyalcohols (butanetriol, pentaerythritol), aliphatic polyacids and branched polyether polyols are used as branching agents [108-111]. 

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