Tuning of polyurethane foam mechanical and thermal properties using ball-milled cellulose

[Display omitted] •The cellulose is used as reactive filler in the synthesis of polyurethane foams.•The cellulose is used to tune the chemico-physical and mechanical properties of foams.•Two topologies of cellulose were used: crystalline and amorphous.•A reduction of the thermal conductivity of 33%...

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Bibliographic Details
Published in:Carbohydrate polymers 2020-03, Vol.231, p.115772-115772, Article 115772
Main Authors: Stanzione, M., Oliviero, M., Cocca, M., Errico, M.E., Gentile, G., Avella, M., Lavorgna, M., Buonocore, G.G., Verdolotti, L.
Format: Article
Language:English
Subjects:
Composite polyurethane foam
Crystalline cellulose
Mechanical properties
Thermal conductivity
Ultra-milled cellulose
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Summary:[Display omitted] •The cellulose is used as reactive filler in the synthesis of polyurethane foams.•The cellulose is used to tune the chemico-physical and mechanical properties of foams.•Two topologies of cellulose were used: crystalline and amorphous.•A reduction of the thermal conductivity of 33% is obtained with amorphous cellulose.•The amorphous cellulose modifies the mechanical behavior from rigid to semi-rigid. Cystalline-Cc and ultra-milled Amorphous-Ca cellulose were used as reactive filler to tune the performances of composite polyurethane-cellulose-foams, PUC. The effect of Cc and Ca on chemo-physical and mechanical properties of PUC was analysed through FTIR, morphological analysis, thermal conductivity and compression measurements. FTIR results show that, both Cc and Ca react with isocyanate through the OH functional groups contributing to the formation of a tough cellulose-polyurethane network. Morphological observations show that the addition of both Cc and Ca induces a decrease of average cell-size compared to the pristine-PU, thus confirming that they act as nucleating agent. In addition, the better dispersion of the Ca in the polyol, with respect to Cc induces, a finer cell leading to a reduction of the thermal conductivity around 33 % (for the composite loaded with 20 %wt-Ca) with respect to pristine-PU. Finally, the addition of Ca highly reactive modifies the mechanical behaviour from rigid-brittle to semi-rigid.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2019.115772