Preparation Of Degradable Polyurethane And Its Marine Antifouling Property

In this thesis, we prepare degradable polyurethane by a combination of ring-openingpolymerization and condensation reaction. Our aim is to develop a binder resin with highperformance for marine antifouling coating. The main results are as follows:Firstly, the double hydroxyl-terminated oligomer with different CL/GA ratio issynthesized by ring-opening polymerization of CL and GA monomer using DEG and Sn(Oct)2as initiar and catalyst respectively. Then diisocyanate(LDI),1,4-BD react with oligomeryielding a main chain cleavage polyurethane. Fourier Transform Infrared Spectroscopy(FTIR), Proton Nuclear Magnetic Resonance Spectroscopy (1H-NMR) and Gel PermeationChromatography(GPC) show that the PU are successfully synthesized. Differential ScanningCalorimetry (DSC) and Polarizing Optical Microscope show that GA can reduce thecrystallinity of the PU when the content of GA in soft segment is in the range of0~10%.Static hydrolysis experiments and enzymatic degradation experiments show that theintroduction of GA can accelerate the degradation of the PU. Marine experiments show thatthe degradable polyurethane has a good antifouling property, and the introduction of GA inthe PU can improve their antifouling ability.