Waterborne polysiloxane–urethane–urea for potential marine coatings

Abstract

Waterborne polysiloxane-urethane-ureas (WBPSUU) were prepared through a prepolymer process using siloxane polyol, namely polydimethylsiloxane (PDMS) and polyether polyol, namely poly(tetramethyleneoxide glycol) (PTMG) as the soft segments. The goal of this study was to explore the potential use of polysiloxane-urethane-urea in marine coatings in order to boost the flexibility, adhesion, erosion, and foul-release property with respect to PDMS/PTMG ratio (PDMS wt%). The structural elucidation of the synthesized waterborne polyurethane and WBPSUU was carried out by FTIR, 1 H NMR, and 29 Si NMR spectroscopic techniques. The XPS and AFM analyses indicate that the polymer surface can be silicone enriched with the optimum PDMS content (15.76 wt%). The antifouling property of the coatings was investigated by the immersion test under a marine environment for 90 days. The fouled area was calculated for all the samples and the fouled area (%) decreased with increasing PDMS content. After 90 days the lowest fouled area (5%) was observed in the sample using WBPSUU4 (PDMS 15.76 wt%) among all of the samples.

How I met your elastomers: from network topology to mechanical behaviours of conventional silicone materials

“…This time scale is affected by temperature, hence it is predictable that silicone-urea behaviour should strongly depend on this latter parameter. Note finally that the use of such silicone thermoplastic elastomers is still much less widespread than the covalently cross-linked ones, even though their use has been investigated for anti-fouling purposes 40 , as well as for bio-implantable devices. Note finally that the use of such silicone thermoplastic elastomers is still much less widespread than the covalently cross-linked ones, even though their use has been investigated for anti-fouling purposes 40 , as well as for bio-implantable devices.…”

Waterborne polyurethanes: influence of chain extender in ftir spectra profiles

“…Amide III is highly mixed and complicated by the coupling of the NH deformation modes that are observed in the region between 1200 and 1400 cm −1 . Amide IV, V, and VI bands are highly mixed modes containing a significant contribution from the NH out-of-plane deformation mode, and they are expected to be in the 800-400 cm −1 region [19].…”

“…Amide III bands must be superposed in the mentioned region and amide IV, V and VI bands are probably related to those that are shown between 800 and 400 cm −1 . The absence of a peak in the range of 2000-2300 cm −1 indicates that all of the isocyanate groups reacted in this system [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Table 2 shows the most important characteristic group absorptions present in spectra of the chain-extended polyurethanes and poly(urethane-urea)s films, cast from the aqueous dispersions.…”

Corrosion protection by epoxy/poly(aniline‐co‐pyrrole)/ZnO nanocomposite coating

“…14 On the other hand, the conducting polymers form a passive layer on the metal surface and improve the epoxy coating performance in corrosive media. 1,13,30,31 In addition, coating containing ZnO nanoparticles block the permeation of anions such as Cl − and prevent the corrosion of metallic surfaces. 14 Therefore, hybrid usage of ZnO and conducting polymers will have an excellent effect on epoxy coating performance.…”