Degradable polyurethane for marine anti-biofouling.

Area of Science:

• Materials Science
• Polymer Chemistry
• Marine Biology

Background:

• Polyurethanes (PU) are versatile polymers, but their environmental persistence is a concern, especially in marine ecosystems.
• Developing biodegradable materials is crucial for reducing marine pollution and its ecological impact.
• Antifouling strategies are essential for marine structures, but traditional methods often involve toxic biocides.

Purpose of the Study:

• To synthesize and characterize a novel degradable polyurethane (PU) incorporating copolyester soft segments.
• To evaluate the marine degradability and antifouling performance of the developed PU.
• To explore the potential of this PU as a controlled release carrier for antifoulants.

Main Methods:

• Synthesis of PU via ring-opening polymerization and condensation reaction using ε-caprolactone (CL) and glycolide (GA) soft segments.
• Degradation studies conducted through enzymatic and hydrolytic experiments in simulated seawater conditions.
• Characterization of material properties using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM).
• Marine field tests to assess antifouling efficacy and self-renewal properties.
• Evaluation of PU as a carrier for antifoulant controlled release.

Main Results:

• The synthesized PU demonstrated significant degradability in seawater, outperforming PCL-based PUs due to reduced crystallinity from GA incorporation.
• Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) confirmed lower crystallinity in GA-containing PUs.
• Marine field tests revealed good antifouling ability attributed to the material's self-renewal property.
• The PU effectively served as a carrier for controlled release of antifoulants, enhancing antifouling performance and duration.

Conclusions:

• The novel degradable polyurethane with copolyester soft segments offers a promising environmentally friendly alternative for marine applications.
• The incorporation of glycolide (GA) enhances degradation rates by reducing crystallinity.
• The material exhibits inherent antifouling properties and can be functionalized as an effective controlled-release system for antifoulants, improving sustainability in marine environments.