Properties of waterborne polyurethane‐fluorinated marine coatings: The effect of different types of diisocyanates and tetrafluorobutanediol chain extender content

Abstract

Three series of waterborne polyurethane-(WBPU) fluorinated coatings were prepared with single aliphatic (4,4 0 -dicyclohexylmethane diisocyanate, H 12 MDI), aromatic (4,4 0 -diphenylmethane, MDI) and a mixture of aliphatic and aromatic diisocyanates (1 : 1). Different contents of 2,2,3,3-tetrafluoro1,4-butanediol (TFBD) as a chain extender were used in the WBPU coatings. The fluoro-enriched surface of the WBPU coatings was obtained with a combination of a high TFBD content (8.77 mol %) as well as the aliphatic or mixed diisocyanates. The tensile strength, Young's modulus, elongation at break (%) and adhesive strength were characterized with respect to the TFBD contents. The mechanical strength and adhesive strength increased with increasing TFBD content in the three series. In artificial salt water, the maximum adhesive strength of WBPU was observed for this coating, which was achieved by TFBD bonded H 12 MDI of mixed diisocyanates with a higher TFBD content (8.77 mol %). V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39905.

Synthesis and properties of UV-curable polyurethane acrylates containing fluorinated acrylic monomer/vinyltrimethoxysilane

“…6 show the water/methylene iodide contact angles and the surface tension of UV-cured polyurethane acrylates containing a range of VTMS contents (0-9 wt% values determined using AFM implies surface change from smooth to rough. In our previous study, we found that the RMS value (surface roughness) increased with increase in fluorinated component content in fluorinated polyurethanes [48]. Therefore, the increase of contact angles/decrease of surface tension of film samples prepared here with increasing VTMS content should be attributed to not only the lower attractive force of fluorine/silicone components in the uppermost surface, but also the surface roughness.…”

Synthesis of a Waterborne Polyurethane-Fluorinated Emulsion and Its Hydrophobic Properties of Coating Films

“…In FT-IR spectrum of CCWPU, the characteristic peaks at 3342 cm −1 , 2955 cm −1 , and 1734 cm −1 are assigned to stretching vibrations of −NH−, −CH 2 −, and −CO, respectively. 26,27 The bending vibrations of −NH− are observed at 1538 cm −1 , while the absorption bands at 1224 and 1180 cm −1 are attributed to the stretching vibration of −COO−. These characteristic bands prove the existence of the carbamate groups.…”

“…XPS is a surface chemical analysis technique for analyzing the surface chemistry of a material in the original state or after some treatment. , Figure presents the XPS spectrum of WFPU. According to the literature, ,, the signal peak of the fluorine element always appears around 688 eV.…”

A New Strategy for the Synthesis of Fluorinated Polyurethane

“…Fluorocarbon chains or groups have been incorporated into polyurethanes by fluorinated chain extenders, [17,18,19,20,21] diisocyanates, [22] glycols, [23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41] side groups/chains [42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58], and end-cappers [59,60,61,62,63,64,65,66]. In 2005, for the first time, a novel fluorinated polyurethane based on polyurethane macromonomers partly acrylate-endcapped with hexafluorobutyl acrylate was synthesized through macromonomer radical copolymerization [17].…”