AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: R. D. PAŞCA, TITUS A. BEU.
DOI: 10.24193/subbphys.2019.09
Published Online: 2019-12-30
Published Print: 2019-12-30
pp. 83-90
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The two biopolymers, namely polyethy-lenimine (PEI) and polyethylene glycol (PEG) in linear configurations, with a different range of polymerization, containing between 3 and 25 repeat units, have been studied by means of 3 functions of state: enthalpy, entropy and Gibbs free energy in standard conditions, using density functional (DFT) calculations. The preliminary data show that the stability of the two polymers decreases with the increasing of their degree of polymerization, namely with the increasing of their chain length.
Key words: Thermodynamics, functions of state, biopolymers, PEI, PEG
