Preparation, properties, and applications of acrylic–polyurethane hybrid emulsions in extinction electrophoresis

Abstract

Aqueous acrylic-polyurethane hybrid emulsions (PUA) were fabricated by semibatch emulsion copolymerization using a mixture of acrylic (AC) monomers in the presence of an isocyanate terminated polyurethane (PU). The effects of PU content on the morphology of the hybrid emulsions and film properties were here investigated in detail using FT-IR, UV, TEM, and SEM. TEM images clearly showed that hybrid emulsions exhibited a core-shell structure before neutralization. However, after neutralization with N,N-dimethylethanolamine, the typical particles exhibited phase inversion, producing particles with irregular hemispheres shapes and diameters about 0.5 lm. SEM images showed that the film surface became rougher as PU content increased, peaking at 10 wt %, the gloss of this film was 23.1 (60 ). The UV transmittance spectra of the PUA hybrid emulsion within a wavelength range 700-200 nm decreased as PU content increased. This was consistent with the changes in the surface roughness of the film. Electrophoresis took place on an aluminum alloy surface and the product was dried at 120 C. The film exhibited excellent mechanical performance due to curing reaction between the N@C@O group on PU and hydroxyl group on the AC copolymer. The gloss of the film was found to be as low as 4.0 after electrophoresis testing. These films may be useful in practical extinction electrophoresis. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40078.

Matt Polyurethane Coating: Correlation of Surface Roughness on Measurement Length and Gloss

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Matting films prepared from waterborne acrylic/micro‐SiO2 blends

“…The SEM images in Figure (a,b) show that both of pure AC polymer and AC/SiO 2 hybrid membranes are homogeneous and smooth surface. The morphology is closely related to the nature of the interactions between phases . The morphology resulted from a competition between the cross‐linking kinetics and the phase separation kinetics due to the incompatibility of SiO 2 in the AC composites .…”

Rapid and sensitive detection of trace malachite green and its metabolite in aquatic products using molecularly imprinted polymer-coated wooden-tip electrospray ionization mass spectrometry

“…The aqueous silicone-modied acrylate molecularly imprinted emulsion (SMAMIE) was synthesized by seed emulsion polymerization. 75 It is worth pointing out that the silicone composition was used to lock MIPs on the wooden tip. Firstly, acrylate functional monomer including 0.3 g of MMA, 0.15 g of AA, 0.6 g of St, 0.6 g of HPA, 4.5 g of 2-EHA and 4.5 g of BA were dissolved into 24 mL of DI water, followed by adding 0.15 g of OP-10 and SDS emulsier under 20 000 rpm vigorous stirring for 15 min to form a preemulsion.…”