INFLUENCE OF SURFACE MODIFICATION TO MECHANICAL ANDTHERMAL PROPERTIES OF NANOMODIFIED ACRYLIC DENTAL RESIN

[摘要] This paper investigated the processing and characterization of dental nanocompositesbased on poly(methyl methacrylate) (PMMA) matrix reinforced with zirconium dioxide(ZrO2) nanoparticles were prepared by in-situ free radical polymerization. Surfacefunctionalization of ZrO2 was performed by using silane coupling agents with vinyl andmethacryloxy organo-functional groups. FTIR spectrometry was employed in order tocharacterize functionalized surface of zirconium oxide and to evaluate chemicalinteractions between the fillers and matrix in nanocomposites. Micro Vickers hardnessshowed significant improved resistance to indentation of dental nanocomposites whenmodified nanoparticles were employed. Obtained SEM images showed that silanecoupling agents enabled effective dispersion of nanoparticles in matrix. Thermalproperties of nanocomposites were analyzed by differential scanning calorimetry (DSC).Low energy impact test was performed in order to determine the mechanical properties ofnanocomposites.

[学科分类] 生物技术

[关键词] Nanocomposites;zirconia;acrylic resin;silanes