Thermomechanical properties and phase structure of epoxy/silica nano‐hybrid materials constructed from a linear silicone oligomer

Abstract

Epoxy‐grafted silicone oligomer (ESO), which has a linear silicone chain in the backbone moiety, was synthesized from a trifunctional alkoxysilane via a sol–gel reaction. Characterization of ESO was performed with 1H and 29Si NMR, Fourier transform infrared, and gel permeation chromatography. The number‐average molecular weight of ESO was 3300. By adding the silicone oligomer as the inorganic source in the curing process of the epoxy resin, novel epoxy/silica hybrid materials were prepared. It was observed by transmission electron microscope that fine silica‐rich domains of about 5‐nm diameter were uniformly dispersed in the cured epoxy matrix. Thermomechanical properties of the hybrid materials were also investigated. The storage modulus in the rubbery region and the peak area of the tan δ curve at the glass‐transition region increased and decreased, respectively, with the hybridization of the silica network. The mobility of the epoxy network chains should be considerably suppressed by the hybridization with the silica network. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1631–1639, 2005

Relationships between nanostructure and dynamic-mechanical properties of epoxy network containing PMMA-modified silsesquioxane

“…The MMA content in the PM1 comes from the methacrylate moiety in the silane precursor, since there was no added MMA. The different species are identified according to the conventional T n notation, where T designs the trifunctional units and n corresponds to the number of neighboring silicon interconnected through the oxygen atoms of the first sphere of coordination [20,44]. Therefore, T 0 , T 1 and T 2 design the non condensed, monomeric and dimeric species, respectively, while the T 3 units refer to the completely condensed species.…”

“…Consequently an improvement of thermal, oxidative and dimensional stability as well as mechanical performance of many polymeric resins is usually achieved. Mono-and multi-functionalized silsesquioxanes containing epoxy [7,[19][20][21][22][23][24][25][26][27], amino [28][29][30][31][32], mercapto [33], maleimido [34,35], and isocyanate groups [36] have been successfully employed in the preparation of epoxy resin-based hybrid materials. Mono-functionalized silsesquioxanes are prepared by corner capping reaction of a trisilanol with a functionalized trialkoxy silane, and results in POSS molecules grafted onto the epoxy matrix [14].…”

“…Epoxy resin/POSS hybrid materials are prepared by mixing both components [23] or by performing the hydrolysis/condensation of the silane precursor in the presence of the epoxy matrix. When the POSS molecule is prepared in situ, the inorganic siloxane particles are more linked with the epoxy network because the alkoxy groups of the silane precursor can react with the hydroxyl groups formed by the ring opening reaction of the epoxy groups, through an ether exchange reaction [20]. Inorganic-organic hybrid compounds constituted by siloxane particles chemically linked to another polymer that is miscible with the epoxy matrix is also a good strategy for the development of new nanostructured epoxy hybrid networks.…”

Thermal properties and flame retardancy of polyglycidyloxypropyl silsesquioxane/layered titanate nanocomposites

“…[8][9][10] In these systems, they show high glass transition temperature and thermal decomposition temperatures. However, we could not prepare the materials which have a self-extinguishing property.…”

Curing of Epoxy Resin by Hyperbranched Poly(amidoamine)-grafted Silica Nanoparticles and Their Properties

“…19 It is interesting to note that the modulus in the rubbery region and glass-transition region of epoxy resin/silica nanocomposite using Silica-PAMAM:BF 3 increased with increasing content of Silica-PAMAM:BF 3 .…”