Novel porous bioabsorbable phosphate glass matrix nanocomposites incorporating trisilanolphenyl polyhedral oligomeric silsesquioxane prepared by extrusion

摘要

Graphical abstractDisplay OmittedHighlights•Highly porous POSS/Pglass matrix nanocomposites were prepared by extrusion.•The porosity was ascribed to water vapor fromin situcondensation reaction during extrusion.•Nano-scale dispersed POSS was confirmed by SEM-EDX analysis.•The POSS concentration can be used to control the properties of the nanocomposites.AbstractPhosphate glass matrix nanocomposites containing trisilanolphenyl polyhedral oligomeric silsesquioxane (POSS) were investigated for the first time to accelerate efforts to develop novel hybrid phosphate glass/POSS composites with enhanced benefits. Tin fluorophosphate glass (Pglass) having ultra-low glass transition temperature (Tg) was utilized as the matrix material in extrusion at relatively low processing temperature (i.e., 270±10°C) compared to that of typical borosilicate and sodalime glasses. The resulting nanocomposites materials were highly porous due to evaporation of condensed water producedin situfrom polysiloxane condensation reaction between the Pglass and POSS during the extrusion process. As the amount of POSS was increased in the Pglass matrix material, the glass transition temperature was significantly changed by the bulky POSS molecules. The novel porous nanocomposites should find a number of uses in applications at elevated temperatures where conventional organic polymer foam materials are not useable.