Abstract
Abstract An N-halamine precursor, namely, 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-one (AHM), was used as a chain extender in the preparation of a series of N-halamine polyurethane (PU) films, in order to also instill antibacterial properties. The mechanical properties, thermodynamic performance, and antimicrobial performance of the functionalized PU films were systematically studied. The results showed that the addition of AHM could improve the thermodynamic and mechanical properties of the developed PU films. Conducting tests in the presence of Escherichia coli and Staphylococcus aureus as the model microorganisms revealed that prior to chlorination the antibacterial properties of the chlorinated PU-AHM-Cl films improved significantly relative to the analogous films. The excellent antibacterial properties and the overall superior performance of the PU-AHM-Cl films allow their potential application in microbiological protection materials and related fields.
Highlights
In contrast to the low stability, low acid resistance, and low mechanical strength of some natural antibacterial polymers, polyurethane (PU) has advantageous physical and chemical properties
The successful preparation of antibacterial PU-AHM films using AHM as the chain extender was confirmed by FTIR (Figure 2)
The characteristic peak of C−N, located at 1,550 cm−1, remained in the PU-AHM2.0-Cl after chlorination, and the stretching frequency of the carbonyl band shifted to 1,641 cm−1
Summary
In contrast to the low stability, low acid resistance, and low mechanical strength of some natural antibacterial polymers, polyurethane (PU) has advantageous physical and chemical properties. This polymer is readily available, inexpensive, and highly biocompatible, . Once the oxidative halogens are consumed, N-halamine compounds are recharged by soaking them in bleach. Based on their unique antibacterial performance, N-halamine compounds have been used extensively in the medical and health fields, for water treatment, food safety, and textile materials [25,26,27]. An N-halamine precursor, 5,5dimethylhydantoin (DMH), was covalently linked to the surface of PU using hexamethylene diisocyanate as the
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