2016 (3) 7

https://doi.org/10.15407/polymerj.38.03.236

Influence of physical factors and cultures of microorganisms on segmented polyurethane’s degradation

L.V. Kobrina, V.V. Boiko, T.V. Dmitrieva, V.V. Bortnitsky, T.M. Prokopiv, S.V. Riabov, M.V. Gonchar

Institute of Macromolecular Chemistry the NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Institute of Cell Biology, NAS of Ukraine

14/16, Dragomanova str., Lviv, 79005, Ukraine

Polym. J., 2016, 38, no. 3: 236-243.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

This paper deals with studying of the influence of physical factors (UV-radiation, temperature, humidity) and microbial cultures (Yarrowia lipolytica, Bacillus subtilis, Pseudomonas fluorescens) on the structure of the segmented polyurethane (SPU) based on the oligobuthyleneglycoladipinate during its degradation. Method of pyrolysis mass spectrometry was used to analyze the processes. It was found, that the original SPU and SPU after UV irradiation have a two-stage character of their gas-discharge products, which confirms the presence of two blocks in the molecular structure of the SPU. Influence of physical factors on the SPU leads to changing of the thermogram profile, that is a result of destruction of the ester groups of oligoglycol component of SPU, decrease the number of hydrogen bonds at the interface between the hard domains with a flexible matrix, formed by the oligoester units, with simultaneous weakening of intermolecular interactions in the bulk of the two blocks. Investigations have shown that all cultures of microorganisms being used in the experiment, anyway affect on the SPU film, but Bacillus subtilis and Pseudomonas Fluorescens cultures are the most effective, obviously, due to their ability to consume nitrogen-containing (diisocyanate) component of the SPU.

Key words: segmented polyurethane, degradation, physical factors, microbial cultures, pyrolysis mass spectrometry, structure.

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