Here,we report the mechanical and water sorption properties of a green composite based on Typha latifolia fibres.The composite was prepared either completely binder-less or bonded with 10%(w/w)of a bio-based resin whi...Here,we report the mechanical and water sorption properties of a green composite based on Typha latifolia fibres.The composite was prepared either completely binder-less or bonded with 10%(w/w)of a bio-based resin which was a mixture of an epoxidized linseed oil and a tall-oil based polyamide.The flexural modulus of elasticity,the flexural strength and the water absorption of hot pressed Typha panels were measured and the influence of pressing time and panel density on these properties was investigated.The cure kinetics of the biobased resin was analyzed by differential scanning calorimetry(DSC)in combination with the iso-conversional kinetic analysis method of Vyazovkin to derive the curing conditions required for achieving completely cured resin.For the binderless Typha panels the best technological properties were achieved for panels with high density.By adding 10%of the binder resin the flexural strength and especially the water absorption were improved significantly.展开更多
Linseed oil was epoxidized using hydrogen peroxide (H2O2), acetic acid (AcOH) and ion exchange resin AmberliteIR-120 as a catalyst. Epoxidized oil was separately dissolved in isopropyl alcohol (IPA) or diethylene glyc...Linseed oil was epoxidized using hydrogen peroxide (H2O2), acetic acid (AcOH) and ion exchange resin AmberliteIR-120 as a catalyst. Epoxidized oil was separately dissolved in isopropyl alcohol (IPA) or diethylene glycol butylether (DGBE) and phosphorylated with different amounts of phosphoric (H3PO4) acid (1%, 2%, 3% and 5%). Theformation of phosphate polyesters was confirmed by Fourier-transform infrared (FTIR) and 31P nuclearmagnetic resonance (NMR) spectra. Based on the synthesized polyols, polyurethane (PU) coatings were prepared.PU coating based on linseed oil diethylene glycol ester polyol was used as the reference. For the characterizationof coatings, mechanical tests and thermogravimetric analysis (TGA) were used. The flammability parameters ofwood samples with PU coatings at a heat flux of 35 kW/m2 were determined. It was found that PU coatings basedon IPA polyols had higher mechanical characteristics, char residue upon thermal decomposition and flameretardancy.展开更多
基金funding and support from the Austrian Research Promotion Agency(FFG).
文摘Here,we report the mechanical and water sorption properties of a green composite based on Typha latifolia fibres.The composite was prepared either completely binder-less or bonded with 10%(w/w)of a bio-based resin which was a mixture of an epoxidized linseed oil and a tall-oil based polyamide.The flexural modulus of elasticity,the flexural strength and the water absorption of hot pressed Typha panels were measured and the influence of pressing time and panel density on these properties was investigated.The cure kinetics of the biobased resin was analyzed by differential scanning calorimetry(DSC)in combination with the iso-conversional kinetic analysis method of Vyazovkin to derive the curing conditions required for achieving completely cured resin.For the binderless Typha panels the best technological properties were achieved for panels with high density.By adding 10%of the binder resin the flexural strength and especially the water absorption were improved significantly.
文摘Linseed oil was epoxidized using hydrogen peroxide (H2O2), acetic acid (AcOH) and ion exchange resin AmberliteIR-120 as a catalyst. Epoxidized oil was separately dissolved in isopropyl alcohol (IPA) or diethylene glycol butylether (DGBE) and phosphorylated with different amounts of phosphoric (H3PO4) acid (1%, 2%, 3% and 5%). Theformation of phosphate polyesters was confirmed by Fourier-transform infrared (FTIR) and 31P nuclearmagnetic resonance (NMR) spectra. Based on the synthesized polyols, polyurethane (PU) coatings were prepared.PU coating based on linseed oil diethylene glycol ester polyol was used as the reference. For the characterizationof coatings, mechanical tests and thermogravimetric analysis (TGA) were used. The flammability parameters ofwood samples with PU coatings at a heat flux of 35 kW/m2 were determined. It was found that PU coatings basedon IPA polyols had higher mechanical characteristics, char residue upon thermal decomposition and flameretardancy.
