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Research Institute of Textile Chemistry and Textile Physics, Leopold-Franzens University Innsbruck
Höchsterstrasse 73, A-6850 Dornbirn, Tel , Modification of Physical Performance of Regenerated Cellulose Substrate by Physical and Chemical Process Uttam C. Paul, A. P. Manian, B. Siroka, T. Bechtold WP RT 3 STEP-ITN Mid-Year Meeting, Unilever Netherland , March , 2010
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Outline Background and Goal of Research Experimental
WP RT 3 Outline Background and Goal of Research Experimental The Most Important Results up to Now Summary of My Most Relevant Findings Acknowledgement WP RT 3 STEP-ITN Mid-Year Meeting, Unilever , Netherland , March 2010
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Polysaccharide (PS)- Cellulose
Background & Goal Polysaccharide (PS)- Cellulose Most abundant organic compound on the planet Plant cell wall component Gives tensile strength to cell wall Very high molecular weight insoluble polymer of glucose -1-4 glycosidic bonds These bonds give cellulose a very rigid straight parallel chain that has extensive H- bonds Insoluble in water WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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Polysaccharide - Pectin
Background and Goal Polysaccharide - Pectin Pectin is obtained from citrus peel and apple pomace. Water soluble PS Pectins are anionic ion exchangers ~85% galacturonic acid Some are esterified with methyl alcohol DE = degree of esterification WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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Polysaccharide - Alginate
Background and Goal Polysaccharide - Alginate Alginate obtained from seaweed Polymer of D- mannuronic acid and L-guluronic acid Water soluble PS Properties depend on M/G ratio Highly viscous Form gels when: 1. Ca2+ or trivalent ions 2. pH is at 3 or less WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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Polysaccharide - Xanthan
Background and Goal Polysaccharide - Xanthan Produced by Xanthomonas a microbe that lives on leaves of cabbage plants Water soluble PS Cellulose backbone with charged trisaccharide branches Branching prevents gelation Very viscous due to charged branches WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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Chemical/ Physical Process
Background and Goal Regenerated Cellulosic materials: viscose, lyocell, ... Polysaccharides (PS): Pectin, Alginate, Xanthan... Immersion in Polysaccharides solution Chemical/ Physical Process New PS based products WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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Treatment And Analysis No Yes Chemicals Quantification of PS
Cellulosics Polysaccharides Quantification Moisture content SRV Sorption Treatment And Analysis No Yes Chemicals Quantification of PS Alternative Sorption technique Analysis Methods COD Physical/Chemical Properties Detection Ca2+ , Mg2+ .….incorporation or deposition of PS Analytical Technique WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland March , 2010
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COD digestion tubes of treated PS
Results Quantification of Polysaccharide by Chemical Oxygen Demand (COD) Method Polysaccharide quantification was achieved by introducing the polysaccharide to chemical oxygen demand (COD) tests. The organic material is digested in a strong chemical oxidant and the amount of oxidant consumed in the reaction is measured and expressed as “milligram of O2 per liter of water”. COD digestion tubes of treated PS 2KC8H5O4 +10Cr2O H+ 16CO2 + 46H2O + 20Cr3+ + 2K+ 2KC8H5O4 + 15O2 + 2H+ 16CO2 + 6H2O + 2K+ WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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Results COD (mg O2/l) vs. polysaccharides concentration (g/l)
WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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Results Comparison of Measured COD with Theoretical COD Polysaccharide
Measured CODs Theoretical CODs % Moisture Content in Polysaccharides Pectin 910 1005 10.1 Alginate 676 909 11.1 Xanthan 878 1123 11.4 WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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Results SRV values (g/g) vs. polysaccharides concentration (g/100g solution) WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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Results COD (mg O2/l) of polysaccharides solutions before/after substrate immersion WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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SUMMARY Chemical oxygen demand method can be used to quantify polysaccharides, as the values are linearly related to their amounts weight and are sensitive to small changes. The measured values of COD are comparable to theoretical values. There was no sorption of polysaccharides when cellulosic substrates were simply immersed in polysaccharides solution. Alternate routes for polysaccharides incorporation in cellulosic substrates are being investigated. WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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(a). Prof. Thomas Bechtold (b)1. Dr. Avinash Prodip Manian
Acknowledgement The research leading to these results has received funding from the European Community's 7th Framework Programme [FP7/ ] under grant agreement no (a). Prof. Thomas Bechtold (b)1. Dr. Avinash Prodip Manian 2. Dr. Barbora Siroka WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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Thank You for Your Attention
WP 1 RT 3 STEP-ITN Mid-Year Meeting, Unilever, Netherland, March 2010
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