Ethylene glycol adipate oligomers

Enzymic Degradation of Ethylene Glycol Adipate Oligomers at the Air-Water Interface... 

The present work investigates the action of pancreatic lipase on spread monolayers of ethylene glycol adipate oligomers. The tritiated hydrolysis products of the uniformly labeled substrate escape into the subphase. Surface radioactivity measurements allow us to determine the substrate concentration at the interface (2, 3) and the extent of the enzymic reaction. The kinetics were investigated as a function of subphase pH and temperature and substrate length and concentration. By... 

Materials. Ethylene glycol adipate oligomers were synthesized using the method of Youngson and Melville (12). Condensation of ethylene glycol with adipic acid produced a polymer with a molecular weight nearly proportional to the reaction time. 

Cyclic oligomer formation during polycondensation has been studied for the ethylene glycol-adipic acid system and oxycycloeicosanone has been identified. Similarly, oligomers have been isolated and identified from the preparation of poly(butylene glycol terephthalate). ... 

If other glycols, such as diethylene glycol, are substituted for ethylene glycol, the corresponding oligomers are formed. These can subsequently be polymerized with aliphatic diacids as adipic or 4,4 -diphenylmethane diisocyanate to give rigid elastomers [31]. Additive to control luster, color, and so on can be added in the usual manner before and after polymerization. 

Poly(butylene succinate) belongs to the poly(alkylene dicarboxylate) family that can be obtained by polycondensation of a,o>-diols such as ethylene glycol and 1,4-butanediol, with aliphatic dicarboxylic acids, such as succinic and adipic acid. PBS is commonly prepared via esterification of succinic acid and BDO or transesterification of dimethyl succinate and BDO to oligomers followed by a subsequent polycondensation reaction, removing excess BDO. Catalysts include SnCh [81], p-toluenesulfonic acid [82], tetrabutyltitanate [83] and lanthanide triflates [84]. To produce PBS with sufficiently high molar mass often chain-extenders are used. Examples are the use of diisocyanates [83,85-87], bisoxazoline [88] and biscaprolactamates [89]. 

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