The influence of hydroxyapatite modification on the cross-linking of polydimethylsiloxane/HAp composites.
Hydroxyapatite (HAp) was modified by the action of various hydrophobic agents based on silicon-containing compounds. The influence of the type of applied agent on the thermodynamic and kinetic parameters of the cross-linking of poly(dimethyl siloxane)/HAp composites was investigated. All the modified HAp particles became hydrophobic and these samples were used to synthesize the polysiloxane/hydroxyapatite composites (PDMS/HAp). The possible modes of interaction between the hydroxyapatite and hydrophobing agents were discussed. The most probable interaction between hydroxyapatite and the applied hydrophobing agents is hydrogen bonding. PDMS/HAp composites were formed directly in the cell of the DSC and cross-linking was investigated in situ. It was determined that the introduction of hydroxyapatite into polysiloxane matrices changed the enthalpy of cross-linking, as well as the activation energy of cross-linking and reaction order, while the introduction of modified HAp led to thermodynamic and kinetic parameters more similar to those of the cross-linking of unfilled elastomer.
Jovanovic
J
J
Institute of Technical Sciences of the Serbian Academy of Science and Arts, Knez Mihailova 35, 11000 Beograd, Serbia and Montenegro.
Adnadjevic
B
B
Kicanovic
M
M
Uskokovic
D
D
D001672:Biocompatible Materials / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D006860:Hydrogen Bonding; D057927:Hydrophobic and Hydrophilic Interactions; D006882:Hydroxyapatites / Q000737:chemistry*; D007700:Kinetics; D012828:Silicones / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013816:Thermodynamics
D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D004129:Dimethylpolysiloxanes; D006882:Hydroxyapatites; D012828:Silicones; C013830:baysilon