1ª edição do CQE Days, organizada pelo Centro de Química Estrutural, realizada na Academia das Ciências de Lisboa, de 30-31 de maio de 2019 - https://cqe.tecnico.ulisboa.pt/cqedaysThe main goal of this line of research is the realisation of experimental measurements of thermophysical properties of a homologous series of ethylene and polyethylene glycols [H(OCH2CH2)nOH], and the development of correlation methods, with an accuracy adequate for the applications.
Ethylene glycols and poly (ethylene) glycols (PEG) are widely used in many industrial applications as green solvents and as components of important sustainable processes as they are considered environmentally acceptable compounds [1,2]. Liquid Poly(ethyleneglycols) [PEGs] are in general considered as green solvents. They are non-volatile; their toxicity is very low, such that they are being used as food additives [3]. PEGs have been found to be biodegradable by bacteria in soil or sewage, but the ability of bacteria to biodegrade PEG decreases with increasing molecular weight [3].
The study of this series of compounds is important in many respects, not only because it is aimed at the study of PEGs which have innumerable practical applications but also because this study can be useful to monitor the degree of polymerization in the production of PEGs, themselves.
In the present work, the viscosity of three ethylene glycols, namely diethylene, triethylene and tetraethylene glycols [4] and PEG 400 were measured with high accuracy using the vibrating wire technique at moderately high pressures. Complementary experimental density, surface tension and rheological behavior were obtained for the same liquids.
One of the aims of the work is to analyse the relation of the present results with those obtained before for CO2 saturated PEG400 mixturesProject UID/QUI/00100/2013 and Project UID/QUI/00100/2019 funded by Fundação para a Ciência e a Tecnologia (FCT), Portugal.N/
