Add time:08/26/2019         Source:sciencedirect.com

The present work investigates the biodegradation of nonisocyanate condensation polyurethanes (NIPU) by aerobic bacterial strains (Achromobacter xylosoxidans G21). The study was conducted on linear and branched polyurethanes prepared from oligoetherol, urea, phenolsulfonic acid, 2-hydroxynaphthalene-6-sulfonic acid and various amounts of formaldehyde. The tensile strength, pH, emulsification and protein concentration were determined during the biodegradation of the prepared polymers. FTIR and DSC were employed for the structure characterization of the tested samples and SEM for the morphology analysis. It was confirmed that the regularity of the structure and the increasing degree of cross-linking of the polymer led to the increase in resistance to bacteria. Based on the elemental analysis, DSC and FTIR, it was found that urea, urethane and sulfonic groups which formed the crystalline regions were subjected to biodegradation. SEM micrographs have shown the disappearance of ordered hard domains. Besides the pronounced biodegradation resistance, synthesized NIPU exhibited acceptable performance properties (tensile strength and strain at break before and after biodegradation). The tensile strength of branched polyurethanes increased with the increasing amount of formaldehyde due to an increased degree of crosslinking.

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