Volume 141, Issue 14 e55181
RESEARCH ARTICLE

Synthesis and surface modification of sunflower oil-based non-isocyanate polyurethane: Physicochemical and antibacterial properties

María del Pilar Maya

María del Pilar Maya

Grupo De Investigación Ciencia De Los Materiales, Sede de Investigación Universitaria, SIU, Universidad De Antioquia, Medellín, Colombia

Contribution: Conceptualization (lead), Formal analysis (lead), ​Investigation (lead), Methodology (lead), Validation (equal), Writing - original draft (lead), Writing - review & editing (supporting)

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Susana Torres

Susana Torres

Cellular and Molecular Biology Unit; Corporación Para Investigaciones Biológicas (CIB); School of Microbiology. Universidad De Antioquia, Medellín, Colombia

Contribution: Formal analysis (equal), ​Investigation (supporting), Validation (equal), Writing - original draft (supporting)

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Carmiña Gartner

Corresponding Author

Carmiña Gartner

Grupo De Investigación Ciencia De Los Materiales, Sede de Investigación Universitaria, SIU, Universidad De Antioquia, Medellín, Colombia

Correspondence

Carmiña Gartner, Grupo De Investigación Ciencia De Los Materiales, Sede de Investigación Universitaria, SIU, Universidad De Antioquia, Calle 70 N° 52-21, Medellín 05001000, Colombia.

Email: [email protected]

Contribution: Conceptualization (lead), Formal analysis (lead), Funding acquisition (lead), ​Investigation (lead), Project administration (lead), Resources (lead), Supervision (equal), Validation (equal), Writing - original draft (equal), Writing - review & editing (lead)

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First published: 10 January 2024
Citations: 1

Abstract

In this work, non-isocyanate polyurethane (NIPU) films are synthesized from sunflower oil (SFO) with the object of using a renewable resource and establishing a nonpolluting process. SFO also has the advantage of having a higher level of unsaturation than other commercial oils, which provides more reactive sites to be chemically modified. This feature enables a higher degree of conversion to the two monomers, cyclocarbonate, and polyamine-polyol. NIPU is obtained from their mixture and further crosslinking at 90°C allows the films with suitable mechanical properties to be used in biomedical applications. However, NIPU does not show antibacterial activity, so the surface must be modified. Two methods are used: layer-by-layer coating of alginate-chitosan, and immersion in tea tree oil (TTO), previously activating the surface with acrylic acid (AANIPU). Surface modifications are confirmed by increased hydrophilicity, thermochemical changes, and a drop in mechanical performance. TTO on NIPU films inhibits bacterial growth against S. aureus and E. Coli. NIPU and AANIPU can be accepted as noncytotoxic, while incorporation of the two agents can produce cytotoxicity. No previous reports of such modifications have been found on NIPU films, which appear as promising alternatives for biomedical applications.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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