Title

(Perfluorosulfonate Ionomer)-(Inorganic Oxide) Nanocomposites - Organic Modification of Surfaces of Silicon-Oxide Nanoparticles Grown In-Situ

Document Type

Article

Publication Date

1995

Department

Polymers and High Performance Materials

Abstract

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.

Publication Title

ACS Symposium Series

Volume

585

First Page

66

Last Page

84