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Silsesquioxane-based hybrid nanocomposite with self-assembling properties for porous limestones conservation

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: B. Simionescu, M. Olaru, M. Aflori, C. Cotofana

Editorial: High Perform. Polym., 22, p.42-55, 2010.

Rezumat:

The study was concerned with the synthesis and characterization of a silsesquioxane-based
hybrid nanocomposite with self-assembling properties intended for monumental porous limestone conservation.
Radical polymerization of 3-(trimethoxysilyl)propyl methacrylate in the presence of a primary
amine surfactant yielded a new type of hybrid nanocomposite, in which silica was dispersed as domains
with typical sizes in the nanometer range. The self-assembling properties of the synthesized composite
have been ascribed to the supramolecular assembling abilities of the surfactant, as well as to the combination
of linear, ladder, and cage-like fragments of silsesquioxane type. This new sol–gel approach, in which
the surfactant makes the pore size of the network more coarse and uniform, avoids cracking while drying
inside the stone and thus provides an effective alternative for porous limestone conservation.

Cuvinte cheie: nanocomposite, silsesquioxane, self-assembling, porous limestone conservation