Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 213, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2021.108917
Keywords
Hybrid; Polyurethane foam; Aerogel; Compressive strength; Thermal conductivity
Categories
Funding
- PRIN project: SUSTAIN/ABLE-SimultaneoUs STructural And energetIc reNovAtion of BuiLdings through innovativE solutions
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A new organic-inorganic polyurethane-based hybrid material with enhanced thermal and mechanical properties was reported, prepared using a sol-gel approach. The synthesis method involved the preparation of a siloxane precursor, functionalization of traditional polyol, use of suitable catalysts and silicone surfactants, and foaming process. The resulting material showed improved thermal conductivity, stability, and mechanical properties.
New organic-inorganic polyurethane-based hybrids with enhanced mechanical properties and thermal insulation properties are reported. Polyurethane-based hybrids are characterized by the intimate interactions of their inorganic and organic co-networks and prepared by sol-gel approach, have exhibited properties exceeding those of polyurethane foams, e.g. enhanced thermal stability, durability and thermal insulating effectiveness. However, mechanical properties have previously been poor. Here, new porous organic-inorganic materials consisting of a polyurethane network modified by in-situ formation of aerogel-like polysiloxane domains, were developed. They exhibit a multiscale-porosity which enhances the insulation, mechanical and thermal properties. The synthesis was performed through a novel stepwise process consisting of: preparation of a siloxane precursor based on methyl-triethoxysilane and tetraethoxysilane; functionalization of traditional polyol for polyurethane foams with 3-(triethoxysilanepropyl)isocyanate as coupling agent; use of suitable catalysts and silicone surfactants; and foaming with methylene-di-isocyanate compound. The siloxane precursors and coupling agent led to formation of aerogel-like polysiloxane domains within the walls and struts of the polyurethane foams. The synthesis method enabled increased incorporation of the aerogel-like polysiloxane structures into the foams, compared to literature, with 20 wt% SiO2, reducing thermal conductivity of the hybrid foams 30% compared with pristine polyurethane, in addition to significant improvement in thermal stability and mechanical properties.
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