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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/17398

Title: Peculiarities in the structure - properties relationship of epoxy-silica hybrids with highly organic siloxane domains
Authors: Piscitelli, F.
Buonocore, G.G.
Lavorgna, Marino
Verdolotti, L.
Pricl, S.
Gentile, G.
Mascia, Leno
Keywords: Epoxy resin
Organic-inorganic hybrid
Issue Date: 2015
Publisher: © Elsevier Ltd
Citation: PISCITELLI, F. ... et al, 2015. Peculiarities in the structure - properties relationship of epoxy-silica hybrids with highly organic siloxane domains. Polymer, 63, pp.222-229.
Abstract: Epoxy-silica hybrids were produced from a diglycidyl ether of bisphenol-A resin using Jeffamine 230 hardener with a two-step in situ generation of siloxane domains. The siloxane component was obtained by hydrolysis and condensation of a mixture of γ-glycidoxypropyl-trimethoxysilane and tetraethoxysilane, which was added to the epoxy resin after removal of the formed alcohols and water. The morphological structure of the hybrids was examined by TEM, SAXS and WAXS analysis, and confirmation of the identified co-continuity of the constitutive phases for nominal silica contents greater than 18%wt was obtained by TGA and DMA analysis. While the loss modulus was found to increase monotonically over the entire range of siloxane content, the glass transition temperature exhibited a stepwise increase upon reaching the conditions for phase co-continuity. Molecular dynamics simulations were used to produce model structures for silsequioxanes cage-like structures, as main constituents of the siloxane phase. The predicted interdomain distance between the silsequioxane structures was in agreement with the SAXS experimental data.
Version: Accepted for publication
DOI: 10.1016/j.polymer.2015.03.012
URI: https://dspace.lboro.ac.uk/2134/17398
Publisher Link: http://dx.doi.org/10.1016/j.polymer.2015.03.012
ISSN: 0032-3861
Appears in Collections:Published Articles (Materials)

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