Saturated linear aliphatic polyesters

In order to achieve lower gelation doses for saturated linear aliphatic polyesters such as polycaprolactone, certain functional groups including unsaturation can be incorporated. In this regard, and as will be discussed here, e-caprolactone has been copolymerized with a relatively small amount of allyl glycidyl ether. Therefore, the randomly distributed allyl glycidyl ether units(2-6 mole percent) in the synthesized caprolactone-allyl... 

The octane number of the gasoline fraction composed of the aliphatic polyester fragments could be predicted by taking into account the linear and cyclic oxygenated saturated hydrocarbon nature of the components. 

Polyester Polyols. Polyester polyols are based on saturated aliphatic or aromatic carboxylic acids and diols oi mixtures of diols. The carboxylic add of choice is adipic acid because of its favorable cost/performance ratio. For elastomers, linear polyester polyols of ca 2000 mol wt are preferred. Branched polyester polyols, formulated from higher functional glycols, are used for foam and coatings applications. Phthalates and terephthalates are also used. 

The fuel properties of the pyrolysis oil of an aliphatic polyether-segmented PU could be predicted by taking into account the linear and cyclic oxygenated saturated and olefinic hydrocarbon nature of the components. Elimination of the reactive and toxic diisocyanate from the pyrolysis oil of PU in a lower temperature pyrolysis step is easier in the case of polyether soft segment, because of the larger temperature difference of decomposition steps compared to that of polyester-segmented PU. 

The polymer is quite linear, as can be seen by following the thickened valency lines. It is a saturated polyester resin, because the polymer chain is held together by a series of ester linkages and it contains no aliphatic double bonds. To include an oil fatty acid we would use a monoglyceride instead of ethylene glycol. This would still leave our alcohol a functionality of two, e.g. ... 

A different strategy providing access to linear polyesters derived from fatty acids in which their aliphatic sequences dangle from macromolecular chains (i.e., a type of structure very different to that of linear PE) has been described recently [73]. Various saturated fatty acid methyl esters were malonated to the corresponding methyl diesters, which were polymerised by transesterification with 1,6-hexanediol (Scheme 4.17). 

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