Green polymer chemistry: synthesis of symmetric and asymmetric telechelic ethylene glycol oligomers?
Polymer Chemistry Pub Date: 2014-11-07 DOI: 10.1039/C4PY01223B
Abstract
In this work we investigated the kinetics of the transesterification of divinyl adipate (DVA) with tetraethylene glycol (TEG) using Candida antarctica lipase B (CALB) as a biocatalyst at 50 °C under solventless conditions. We examined the time-dependence of the reactions with various DVA/TEG ratios. Samples were taken at the specified times, and then the composition and end group structures were analyzed by MALDI-ToF mass spectrometry. We found conditions under which polycondensation was minimized and symmetric and asymmetric telechelic TEGs were obtained. Specifically, at DVA/TEG = 1.5 molar ratio 100% of the oligomers had divinyl end groups after 20 minutes reaction time. At DVA/TEG = 3 only vinyl end groups were detected after 5 minutes. HO-(TEG)n-Vinyl was maximized at 70% at DVA/TEG 1/1.5 molar ratio at 10 minutes reaction time, while ～90% HO-(TEG)n-OH was obtained in 20 minutes with TEG excess.
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Journal Name：Polymer Chemistry
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CAS no.: 89640-58-4
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