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Structure characterization of organic-inorganic nanocomposites formed by the sol-gel polycondensation

Published online by Cambridge University Press:  01 February 2011

Libor Matìjka
Libor Matìjka*
Affiliation:
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq.2, 162 06 Prague 6, Czech Republic
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Abstract

The organic-inorganic (O-I) hybrid networks were prepared from well-defined O-I precursors (a) alkoxysilane-endcapped oligomers (ASO) and (b) epoxy-functional silsesquioxane (SSQO) clusters (EC). ASO precursors were crosslinked by sol-gel polycondensation and EC by the reaction of the epoxy groups with oligomeric diamine Jeffamine D2000. Formation, structure and mechanical properties of the networks were followed by SEC, NMR, SAXS and DMA. The O-I block copolymer network is composed of SSQO domains forming network junctions linked by an oligomer chain. Structure of the SSQO crosslink “points” ranges from compact polyhedral cages to large loose SSQO clusters in dependence on the precursor type and catalysis of the sol-gel process. Interphase interaction and mechanical properties of the O-I networks are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 726: Symposium Q – Hybrid Organic-Inorganic Materials , 2002 , Q4.4
Copyright
Copyright © Materials Research Society 2002

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