Fouling Release Property of Polydimethylsiloxane-Based Polyurea with Improved Adhesion to Substrate

Abstract

Polydimethylsiloxane (PDMS)-based coatings are environment-friendly systems for marine fouling release. However, they usually exhibit low adhesion to substrate and poor mechanical properties, which limits their applications. We have developed polyurea (PUa) with PDMS as soft segments and 1,6-hexanediamine as hard segments via a polycondensation reaction. Such polyurea (PDMS-PUa-x) is hydrophobic with water contact angle above 90° and has low surface energy (25–29 mJ·m–2). In particular, its adhesion to the substrate (>1.0 MPa) and modulus (>80.0 MPa) are significantly improved in comparison with those of PDMS coatings. Laboratory bioassay and marine field tests demonstrate that PDMS-PUa-x has good fouling release performance.

Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers

“…Polyurea elastomers are a class of versatile materials with outstanding mechanical, anticorrosion and anti-ageing properties. They have been widely applied in industry as coatings [1,2] for various objects such as storage tanks, ships and even military trucks to protect the objects from moisture, biological deterioration [3] and chemical origin [4]. During the service time of an object, cracks inevitably occur in the coating, leading to devastation of protected object if the cracks are not repaired in a timely way [5].…”

Amphiphilic Polymer Platforms: Surface Engineering of Films for Marine Antibiofouling

“…The latter strategies are based on various alternatives of supramolecular chemistry, self‐assembly, phase‐separation of polymers, and chemical building blocks for the creation of coatings with tunable nanoscale surface properties. Lately, a range of approaches has been investigated that span from bioinspired polymers incorporating bioactive molecules and enzymes to hydrophobic or hydrophilic self‐assembling monolayers, hydrophobic fluoropolymer networks, antimicrobial quaternary ammonium polymers, self‐stratifying polysiloxane hybrids, poly(2‐methyl‐2‐oxazoline)s and polyethylene glycol hydrogels, xerogels, zwitterionic polymers, layer‐by‐layer assemblies, nanocomposites containing nanofillers of varying nanoscale dimensions and photocatalytic nanoparticles, to self‐polishing silyl ester polymers …”

Synthesis and characterization of a novel polyurethane curing agent modified by a diazafluorene derivative

“…The sample plates were placed in an oven at 60 °C curing for 48 h, and the final thickness of the coating was about 100 μm. Then, four adhesive columns were adhered to the coating surface with AB glue for each plate, and the samples were placed in a constant‐temperature and constant‐humidity room for 7 days . The sample size of the adhesion test had to be at least three.…”

“…36,43 Adhesion Test Analysis A graph of the average adhesion values and a photograph of the adhesion test results of the PU coatings with the novel CA (CA-3.3%; this proportion had better properties according to the previous argument) and N75 CA are illustrated in Figures 11 and 12, respectively. Figure 11 shows that the adhesion strength of PU CA was higher than that of PU-N75, except for the first exception data, which accounted for the fact that the pyridine structure increase the mechanical properties of the material (including the adhesion of material) because of the chelation of the pyridine ring, 9,38,44 The coating structure is shown in Figure 13. In addition, the damage area of the coating after the adhesion test was an emphasis index for the property analysis of materials.…”

“…Then, four adhesive columns were adhered to the coating surface with AB glue for each plate, and the samples were placed in a constanttemperature and constant-humidity room for 7 days. 38 The sample size of the adhesion test had to be at least three. The diagram of the test system is shown in Figure 4.…”