Abstract
Novel physically crosslinked polyurethane (PUII), based on isophorone diisocyanates, was prepared by a conventional two-step method. The chemical structures of the PUII were characterized by fourier transform infrared (FTIR), proton nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), scanning electron microscopy (SEM) and DSC. The PUII hydrogels were subjected to solvent-induced self-assembly in THF + water to construct a variety of morphologies. The self-assembly morphology of the PUII was observed by scanning electron microscopy (SEM). The PUII films with different amounts (0.2%, 0.4%, 0.6%, 0.8%, 1.0%) of 1,3,5-Tris(2-hydroxyethyl)hexahydro-1,3,5-triazine (TNO) were challenged with Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Gray mold. The results showed that when a small amount of antibacterial agent were added, the antibacterial effect of films on Botrytis cinerea was more obvious. The mechanical evaluation shows that the antimicrobial polyurethane films exhibit good mechanical properties.
Highlights
Polyurethanes (PUs) are one of the crucial classes of polymers with wide applications and properties, because their properties can be tailored by varying the components from which they are constructed [1,2,3,4,5,6,7]
Novel physically crosslinked polyurethane (PUII) based on isophorone diisocyanates was prepared by a conventional two-step method
PUII was prepared according to the procedure shown in Scheme 1
Summary
Polyurethanes (PUs) are one of the crucial classes of polymers with wide applications and properties, because their properties can be tailored by varying the components from which they are constructed [1,2,3,4,5,6,7]. The synthesis of polyurethanes is carried out in two stages. The first stage is the synthesis of a prepolymer containing free isocyanate groups and in the second stage there are reactions of chain extension or crosslinking of the polymer chains. PUs are composed of hard segments and soft segments. The polar groups of urethane form hydrogen bonds
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