Mechanical and Surface-Chemical Properties of Polymer Derived Ceramic Replica Foams

Abstract

Polymer derived ceramic foams were prepared with the replica method using filler free and filler loaded polysiloxane containing slurries for the impregnation of open celled polyurethane foams. A significant change in mechanical strength, porosity and surface energy, i.e., wettability after thermal treatment between 130 °C (crosslinking) and 1000 °C (pyrolysis) in argon atmosphere was observed. While low-temperature pyrolyzed foams are elastic and hydrophobic, foams pyrolyzed at high temperatures are brittle and hydrophilic, and they possess higher compression strength. Changes of these properties were correlated with the polymer-to-ceramic transformation.

A Simple Method for a Protective Coating on Stainless Steel against Molten Aluminum Alloy Comprising Polymer-Derived Ceramics, Oxides and Refractory Ceramics

“…At 700 • C, the PDC is being ceramized, organic groups split off, and the hydrogen bonds are likely accessible in the matrix. These hydrogen bonds evacuate as hydrogen up to 1000 • C. The presence of these bonds leads to a higher wettability with water and polar liquid [29]. The dispersive component after pyrolysis of the protective layer is low, the wettability to nonpolar material is therefore low.…”

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

“…Ceramic foams have been prepared using several methods such as direct foaming [2][3][4][5][6][7], sacrificial template or fugitives [8][9][10][11][12], replica methods [1,[13][14][15][16] and partial sintering [17,18]. Ceramic foam derived using the abovementioned methods is chemo-thermo-mechanically suitable for further processing.…”

Polymer-Derived Biosilicate®-like Glass-Ceramics: Engineering of Formulations and Additive Manufacturing of Three-Dimensional Scaffolds

“…An additional contribution could come from hydrophilicity. When silicone polymers (i.e., MK/H44) are fired at a high temperature (at 1000 °C), in air, a hydrophilic behaviour results from the separation of the organic groups bonded to the siloxane backbone [ 34 ]. The hydrophilic character brings the material to be well dispersed in water leading to low direct cell–material interactions which in turn reduce the deposition of the materials on the cell membrane since the materials with a hydrophilic character were able to interact dynamically with the cell environment through water molecules.…”