Preparation and characterization of polysiloxane networks containing metallic platinum particles

Abstract

vis and FTIR spectroscopy, swelling measurements, XRD, SEM, and thermogravimetric analysis were applied to control the progress of the reaction or to characterize the intermediate or final products. IR spectroscopy allowed to determine the efficiency of crosslinking process and to investigate the consumption of un-reacted Si-H groups accompanying the reduction of platinum ions. XRD studies confirmed the incorporation of metallic platinum into all systems. Good thermal stability of obtained products was found using thermogravimetric analysis. According to SEM investigations, the applied network as well as the solvent used in the reduction process influenced the dispersion of metallic particles on the surface of the matrices. The obtained Pt-systems exhibited mainly redox activity in catalytic isopropyl alcohol conversion used as a test reaction. Significant differences in catalytic properties between systems containing different matrices were observed. The promoting effect on the catalytic activity was found in the case of C-P type support, i.e. the polysiloxane network obtained using the cyclic hydrosiloxane as the crosslinking agent. V C 2015 Wiley Periodicals, Inc. J. Appl.Polym. Sci. 2016, 133, 43096.

One‐component waterborne in vivo cross‐linkable polysiloxane coatings for artificial skin

“…At the same Karstedt catalyst dosage, the curing time decreased and then increased with increasing V/H mass ratio (Figure a). This was because the curing reaction of the coating was conducted by the hydrosilylation in which appropriate mass ratio of vinyl dimethicone/hydrogen dimethicone would be desired (Stochmal, Strzezik, & Krowiak, ). As for the Karstedt catalyst, the optimum dosage also existed for the shortest curing time at fixed V/H ratio.…”

“…Meanwhile, the Karstedt catalyst capsules also enter into the oil droplets and release the Karstedt catalyst into oil phase by swelling induced diffusion. The hydrosilylation reaction of the mixed dimethicone region rapidly takes place in the presence of Karstedt catalyst (Stochmal et al, ), resulting in increased viscosity and formation of a polysiloxane network of the merged region. This change of the oil phase hinders the further mergence of the oil droplets.…”

Physicochemical and catalytic properties of polysiloxane network–Pt systems

“…The preparation of polysiloxane networks was preceded by the synthesis of D 4 /V 4 polymer, described in details in ref. 27. Thus, D 4 /V 4 polymer was synthesized by equilibrium cationic ring-opening polymerization of octamethylcyclotetrasiloxane (…”

“…This work is a continuation of our earlier research. 27 In the previous paper we reported the successful application of the method allowing the incorporation of metallic Pt particles into polysiloxane network by a chemical reduction of metal ions. Process was conducted in the presence of cross-linking products containing active Si-H groups exhibiting reducing properties.…”

Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

“…We suspect that the interaction between the exterior surface of the polymer may play a role in the formation of these novel shapes. The encapsulation of inorganic nanoparticles by polymer 1 adds up the library of polysiloxanes-stabilized nanoparticles [54][55][56]. Overall, the accommodation of different transition metal NPs is very attracting since they may find application in new catalysis reactions.…”