(Perfluorosulfonate Ionomer)-(Inorganic Oxide) Nanocomposites - Organic Modification of Surfaces of Silicon-Oxide Nanoparticles Grown In-Situ
Polymers and High Performance Materials
SiO2([1) (-) (x/4])(OH)(x) nanoparticles were generated via in situ sol-gel reactions for tetraethoxysilane within polar clusters of perfluorosulfonic acid films. Then, residual SiOH groups on these nanoparticles were post-reacted with diethoxydimethylsilane (DEDMS) and ethoxytrimethylsilane (ETMS), resulting in organically-''shelled'' and interknitted, and simply organically ''shelled'' nanoparticles, respectively. FT-IR and Si-29 solid state NMR spectroscopies established structural incorporation of the di- and tri-methylsilanes onto silicon oxide ''cores'' as well as degree of molecular connectivity within the inorganic phase. Post-reaction with DEDMS rendered the structure more linear. Mechanical tensile experiments indicated a ductile --> brittle transformation upon DEDMS post-reaction, suggesting linking of silicon oxide nanoparticles. On the other hand, a measure of ductility persisted after ETMS post-reaction. Tensile strength was increased after both post-reaction schemes.
ACS Symposium Series
Mauritz, K. A.,
(1995). (Perfluorosulfonate Ionomer)-(Inorganic Oxide) Nanocomposites - Organic Modification of Surfaces of Silicon-Oxide Nanoparticles Grown In-Situ. ACS Symposium Series, 585, 66-84.
Available at: http://aquila.usm.edu/fac_pubs/5769