Neural network modeling of the preparation process of a siloxane‐organic polyazomethine

Abstract

Although apparently simple, the polycondensation reaction leading to polyazomethine is difficult to control because of its equilibrium character, the conversion degree being influenced by a series of parameters. The reaction between a siloxanediamine, 1,3bis(3-aminopropyl)tetramethyldisiloxane, and terephthalaldehyde was performed here in solution (in tetrahydrofuran) without byproducts removal and in absence of any catalyst or pH modifier. Different conditions (co-monomers ratio, dilution, and temperature), considered as input parameters for the process modeling, were varied according to a pre-established experimental program. The viscosity of the reaction mixture was chosen as output parameter, being monitored with a Haake Viscotester 7 Plus-L. The process modeling was performed using a hybrid combination of artificial neural networks and differential evolution algorithm, the last one having the role of developing the neural model in an optimal form. The simulation results showed that the methodology provides accurate results, the model predictions being in close correlation with the experimental data.

Silylated oligomeric poly(ether-azomethine)s from monomers containing biphenyl moieties: synthesis and characterization

“…In general, the silicon atom is part of a siloxane moiety, which implies a Si-O bond. [20][21][22][23][24][25] In 2014, Zaltariov et al 26 reported a PAM with a central silicon atom bonded to four carbon atoms complexed with different metal ions. However, they used a methylene unit instead of an aromatic moiety bonded to a silicon atom which, along with other structural features, rendered the polymer too exible; thus, the T g measured for the polymer was 48 C. For a material to be used for charge transport in a PHOLED device, its T g value must be over 100 C to avoid deterioration of its mechanical properties under high temperature conditions.…”

Stretchable and self-healable spoof plasmonic meta-waveguide for wearable wireless communication system

“…The A01-TPA was synthesized according to the previous work with modification 37 . TPA (14.7 g, 0.11 mol) was added to a 500 ml single-neck round flask and dissolve it with 200 ml of toluene, then A01 (50.1 g, 0.202 mol, 1 mol% excess to facilitate imine bond exchange) was added dropwise under stirring.…”