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Open AccessArticle

Synthesis of Polydimethylsiloxane-Modified Polyurethane and the Structure and Properties of Its Antifouling Coatings

Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China
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Coatings 2018, 8(5), 157; https://doi.org/10.3390/coatings8050157
Received: 24 March 2018 / Revised: 21 April 2018 / Accepted: 24 April 2018 / Published: 26 April 2018
(This article belongs to the Special Issue Novel Marine Antifouling Coatings)
Polydimethylsiloxane (PDMS) could be used to improve the antifouling properties of the fouling release coatings based on polyurethane (PU). A series of polydimethylsiloxane-modified polyurethane coatings were synthesized with various PDMS contents, using the solvent-free method. The effects of PDMS content and seawater immersion on the chain structure and surface morphology were investigated by confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Based on the measurements of contact angles of deionized water and diiodomethane, surface free energies of the coatings were estimated according to the Owens two-liquid method. The PDMS-modified polyurethane exhibited lower surface free energy and a lower glass transition temperature than polyurethane. The presence of PDMS increased the degree of microphase separation, and enhanced the water resistance of the coatings. The optimum amount of PDMS reduced the elastic modulus and increased the ductility of the coating. The presence of PDMS benefited the removal of weakly attached organisms. Panel tests in the Yellow Sea demonstrated the antifouling activity of the PDMS-modified polyurethane. View Full-Text
Keywords: polydimethylsiloxane-modified polyurethane; antifouling; coating; structure; morphology; in-site; seawater immersion polydimethylsiloxane-modified polyurethane; antifouling; coating; structure; morphology; in-site; seawater immersion
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Zhang, Z.-P.; Song, X.-F.; Cui, L.-Y.; Qi, Y.-H. Synthesis of Polydimethylsiloxane-Modified Polyurethane and the Structure and Properties of Its Antifouling Coatings. Coatings 2018, 8, 157.

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