Self-assembled monolayers (SAM) of Schiff base N,N´-ophenylen-bis(3-methoxysalicylaldenimine), designated as V , designated as V-bso, were formed on a copper surface pretreated using different methods. The process of self-assembly was monitored in situ by quartz crystal microbalance (QCM), and the quality and the corrosion protection abilities of SAM were evaluated by the alternating current (AC) impedance technique. It was found that the self-assembly of Schiff base on copper was a fast process; V-o-Ph-V SAM was packed more densely than V-bso SAM. Experimental conditions such as the concentration of V-o-Ph-V, immersion time, and the methods of surface treatment have direct effects on the quality of V-o-Ph-V SAM.
Heat-curable silicone rubber (HCSR) was prepared by using vinyl-containing silicone resin (VSR) as the crosslinking agent instead of polyvinylsilicone oil (C gum). Mechanical properties and crosslink density of the vulcanizates were measured. The results indicate that VSR is a good crosslinking agent for HCSR. The tensile strength, tearing strength, elongation at break, and hardness of the vulcanizate can reach 10.2 MPa, 29.1 kN/m, 720%, and 58 SHA, respectively.
Fourier transform near-infrared (FT-NIR)
spectroscopy combined
with a partial least-squares (PLS) model was successfully employed
to study the hydrolysis kinetics of dimethyldiethoxysilane, methyltriethoxysilane,
and tetraethoxysilane in an acid-catalyzed EtOH system. The high scanning
speed and high sensitivity of FT-NIR spectroscopy enabled the new
method to catch the rapid changes of the H2O and EtOH concentrations
without delay, allowing the kinetic behaviors of the hydrolysis reactions
of the specified alkoxysilanes to be investigated. The hydrolysis
processes were found to follow second-order reactions. The hydrolysis
rate constants, activation energies, and Arrhenius frequency factors
were obtained. The FT-NIR PLS results were in good agreement with
those determined by Fourier transform midinfrared spectroscopy. However,
the FT-NIR PLS method was found to be more accurate, because of the
powerful data processing ability of PLS. All of the results suggest
that the FT-NIR PLS model is a valuable tool for performing kinetic
research.
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