10.10.2018 7 Demand of optimization of dialcohol cellulose preparation Cellulose Dialdehyde cellulose Dialcohol cellulose (DAC) (DOH) Oxidation: • Excess of 4.1 equivalents (per AGU) of NaIO4 is applied in literature Reduction: • Excess of 2.1 equivalents (per AGU) of NaBH4 is applied in literature • Phosphate buffering system is applied in literature which theoretically increases amount of necess. [...] 10.10.2018 8 Optimization of oxidation reaction • Optimizations were done using Spruce/pine sulfate pulp amount of reagents Investigation of solid content 50 2,5 50 2,5 1 100 40 2 40 80 2 0,75 30 1,5 30 60 1,5 0,50 20 1 20 40 1 10 0.5 eq NaIO 0,25 4 0,5 10 20 0,5 1.0 eq NaIO4 0 0 0 0 0 0 0 25 50 0 2 4 6 time [h] solid content [%] Determination of degree of oxidation (DO): 1 eq of NaIO4 leads to ox. [...] 50 % (Titration of release of H+ - ions) 10.10.2018 degree of oxidation [%] fiber length [mm] degree of oxidation [%], crystallinity index [a.u.] yield [%], fiber length [mm] 9 Optimization of reduction reaction • For this investigation a oxidized Spruce/pine sulfate pulp (DO = 37 %) was used Fibre Residual Overall Eq. [...] 100-120 °C) • Decomposition of lignin in DOH of TMP starts at 200 °C DOH = Dialcohol cellulose 10.10.2018 Heat Flow [W/g] Heat Flow [W/g] Heat Flow [W/g] K K K D D D 16 Thermomecahnical properties: Temperature assisted tensile testing Clamp Paper Sample Heating Elements Clamp 10.10.2018 17 Thermomecahnical properties: Temperature assisted tensile testing Sulfate Linters TMP 20 200 20 100 20 60 15. [...] 20 % obtained for Sulfate_DOH at 75-125 °C • Continuous increase in elongation at break determined for TMP materials before their thermal decomposition at circa 200-230 °C DOH = Dialcohol cellulose 10.10.2018 elongation at break [%] maximum force [N] elongation at break [%] maximum force [N] elongation at break [%] maximum force [N] 18 Optical Strain Field Measurement of Dialcoholcellulose Paper 1.
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