Copolymerization of butyl acrylate with methyl methacrylate in a bubble column reactor and the use of copolymer in corrosion protection

Experimental Investigations of AlMg3 Components with Polyurethane and Graphene Oxide Nanosheets Composite Coatings, after Accelerated UV-Aging

“…EIS measurement is another method in evaluation of the corrosion performance for organic coatings [ 44 ]. The Nyquist and Bode diagrams recorded for AlMg3 electrodes coated with PU immersed in 3% NaCl solution are shown in Figure 3 .…”

“…The N-H stretching band appeared in the same domain as OH, and can give some information about modification in the hard segment of PU. It was observed that in an ordered environment N-H groups absorb in the frequency region from 3340 to 3320 cm −1 , but the same group in a disordered environment absorbs at a frequency greater than 3340 cm −1 [ 44 ]. For N3, N2, G, and G1 coatings exposed to UV light the N-H stretching bands presents a tendency to absorb at a higher wavelength (marked by the arrow in Supplementary data, Figure S3a ) which indicate an increase disorder degree of the coatings.…”

“…Before EIS measurement, the coated electrodes were initially kept in the supporting electrolyte (aqueous solution containing 3% NaCl) at an open circuit potential (OCP) for 1 h until a stable state was attained. The measurements were recorded in the frequency range 0.1 Hz to 100 kHz, at the sinusoidal potential amplitude of 10 mV, at open circuit potentials [ 9 , 44 ]. The collected data were fitted to the equivalent electrical circuit by a complex non-linear least squares’ procedure using the ZView-Scribner Associated Inc., software (Zwiev, Connecticut, NC, USA).…”

A Novel Approach of Bioesters Synthesis through Different Technologies by Highlighting the Lowest Energetic Consumption One

“…To overcome these shortcomings, the present paper refers to the synthesis of a series of fatty acid esters via two modern technologies that do not deal with solvent extraction of the azeotrope namely a bubble column reactor [ 11 , 45 ] and a microwave field reactor. In this reactor the process time is short, microwave heating being a widely accepted tool for synthetic chemists [ 26 , 46 ].…”