Politecnico di Torino - Corso Duca degli Abruzzi, 24 - 10129 Torino, ITALY

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ORGANIC-INORGANIC HYBRIDS COLD POLYMERIZED

Cold-cured adhesivesconstructionFRP MatricesHybrid adhesivePolymerization

Introduction

Organic-inorganic hybrids made of an organic phase based on epoxy oligomer and an inorganic phase consisting of silica nanodomains wherein the organic phase based on epoxy oligomer is polymerizable at room temperature and the silica nanodomains are produced in situ thanks to a modified sol-gel process carried out in the absence of organic or aqueous solvents.

Technical features

Organic-inorganic hybrids are constituted by an organic phase based on epoxy oligomers and an inorganic phase consisting of silica nanodomains produced in situ with an innovative modification of sol-gel method, based on the use of a mix of silossanic precursors with inorganic green solvents based on ionic liquids. With a proper selection of raw materials and the optimization of the synthesis conditions, the sol-gel process and the polymerization occur contemporary, with an organic phase that cross-links at room temperature and is linked to the silica nanodomains through covalent bonds. The resulting epoxy-silica hybrid systems can be cured at room temperature and can be used as adhesives for different substrates (concrete, stone, masonry, wood, metals, plastics, glass, ceramics) or matrices for composite materials used in the rehabilitation, repair, consolidation and restoration of infrastructure and cultural heritage.

Possible Applications

  • Resins for injections;
  • Adhesives for different substrates;
  • Matrices for composite materials used in the rehabilitation, repair, consolidation and restoration of infrastructure and cultural heritage;
  • Applications in automotive, aeronautical, naval industries (for fasten, repair, strengthening).

Advantages

  • Able to set and harden at ambient temperature without the presence of any heat-energy source in reasonable times;
  • Develop a greater glass transition temperature with respect to commercial products;
  • No presence of VOC;
  • Enhanced mechanical and thermal properties;
  • Enhanced durability.