Polyamidoaminoepichlorohydrin resin a novel synthetic anti-corrosive water soluble polymer for mild steel

Synthesis, characterization and electrochemical analysis of cysteine modified polymers for corrosion inhibition of mild steel in aqueous 1 M HCl

“…This could be because of the desorption of adsorbed copolymer, leading to a larger exposure of the metal to the acid solution, resulting in an increase in corrosion rate. 52,53 3.2.3 Impedance measurements. The EIS measurements were performed aer the immersion of mild steel in 1 M HCl for 45 min.…”

Synthesis and Application of a Cationic Polyamine as Yankee Dryer Coating Agent for the Tissue Paper-Making Process

“…These OH groups tend to form hydrogen bonds with the cellulose and hemicellulose (polyoses) allowing the adhesion of the paper to the yankee and a posterior detachment once it comes into contact with the creping blade [24]. On the other hand, the multiplet presented between 2.89 and 3.04 ppm are characteristic of the protons presented in the CH groups of the main polymer backbone [4,25]. Finally, a signal from the NH and the OH protons of the chain would be expected around 8 ppm.…”

“…Likewise, the distribution of the cations across the Finally, a signal from the NH and the OH protons of the chain would be expected around 8 ppm. However, the signal is not observed due to the presence of the deuterated solvent that causes an exchange of protons with the hydrogens of this groups and decreases the intensity of the signals [25]. The figure also shows the possible structure of the cationic polymer and its corresponding azetidine ring [4].…”

“…The first loss is due to the amount of water retained in the interstices of the polymer which tend to evaporate between 45 and 100 • C [29]. The second loss is observed between 351 and 378 • C, corresponding to the rupture of the main chains in the polymer, leading to its degradation [25]. The given temperature is higher than the working temperature of the surface of the yankee [5], which indicates that there will be no problems due to the deterioration and subsequent breakage of the main chains of the polymer and the opening of the azetidine rings [5], needed to adhere the paper through OH cellulose groups on the yankee's surface [30].This indicates that a loss of durability of the coating will not be present since the yankee surface temperature is lesser than the coating degradation temperature [5], meaning that the coating performance will not be affected, so loss of bulk in the finished paper rolls and cross machine direction profile issues of uniformity in the produced paper roll will not be observed [7].…”

“…Fourier transform infrared spectroscopy (FTIR) spectrum of the polyamine (Polycoat38 ® ) resin synthesized.3.2. 1 H-NMR Analysis of the Polycoat 38 ® ResinIn the 1 H-NMR spectrum(Figure 4), the characteristic signals of the protons presented in the coating resin can be observed[23][24][25]. The signals at chemical shifts of 0.96 and 1.66 ppm correspond to the protons of the CH2 and CH groups of the azetidine ring, where quaternary nitrogen are generated and relate with OH groups at the end of the ring[25].…”