role of hornification in the disintegration behaviour of TEMPO-oxidized bleached hardwood fibres in a high-shear homogenizer
The effect of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation on the structure of hornified fibres and their disintegration behaviour was studied by a method combining gradual disintegration of the fibre structure in an in-line homogenizer with a chromatographic separation te...
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| Veröffentlicht in: | Cellulose (London) 2014-06, Vol.21 (3), p.1163-1174 |
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| container_title | Cellulose (London) |
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| creator | Kekäläinen, Kaarina Liimatainen, Henrikki Illikainen, Mirja Maloney, Thad C Niinimäki, Jouko |
| description | The effect of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation on the structure of hornified fibres and their disintegration behaviour was studied by a method combining gradual disintegration of the fibre structure in an in-line homogenizer with a chromatographic separation technique. It was seen that hornification prior to TEMPO-mediated oxidation had a notable effect on the disintegration behaviour of bleached cellulose fibres in a high-shear homogenizer and on the properties of the resulting particles. Field-emission scanning electron microscopy imaging of the suspensions and viscosity and transmittance measurements revealed that never-dried oxidized fibres disintegrated into bunches of microfibrils and at higher charge densities into thinner and more individual microfibrils. These microfibrils were obtained from fibres through swelling and ballooning. The hornified fibres were mainly cut into shorter ones as the charge density increased. After reversing the hornification and allowing the fibres to swell further, however, microfibrils were also obtained from this source. The charge threshold for efficient microfibril production from never-dried fibres in the high-shear homogenizer used here was 0.7 mmol/g. |
| doi_str_mv | 10.1007/s10570-014-0210-x |
| format | Article |
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It was seen that hornification prior to TEMPO-mediated oxidation had a notable effect on the disintegration behaviour of bleached cellulose fibres in a high-shear homogenizer and on the properties of the resulting particles. Field-emission scanning electron microscopy imaging of the suspensions and viscosity and transmittance measurements revealed that never-dried oxidized fibres disintegrated into bunches of microfibrils and at higher charge densities into thinner and more individual microfibrils. These microfibrils were obtained from fibres through swelling and ballooning. The hornified fibres were mainly cut into shorter ones as the charge density increased. After reversing the hornification and allowing the fibres to swell further, however, microfibrils were also obtained from this source. 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It was seen that hornification prior to TEMPO-mediated oxidation had a notable effect on the disintegration behaviour of bleached cellulose fibres in a high-shear homogenizer and on the properties of the resulting particles. Field-emission scanning electron microscopy imaging of the suspensions and viscosity and transmittance measurements revealed that never-dried oxidized fibres disintegrated into bunches of microfibrils and at higher charge densities into thinner and more individual microfibrils. These microfibrils were obtained from fibres through swelling and ballooning. The hornified fibres were mainly cut into shorter ones as the charge density increased. After reversing the hornification and allowing the fibres to swell further, however, microfibrils were also obtained from this source. The charge threshold for efficient microfibril production from never-dried fibres in the high-shear homogenizer used here was 0.7 mmol/g.</description><subject>Bioorganic Chemistry</subject><subject>Bleaching</subject><subject>Cellulose fibers</subject><subject>cellulosic fibers</subject><subject>Ceramics</subject><subject>Charge density</subject><subject>Charge reversal</subject><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>Composites</subject><subject>Disintegration</subject><subject>Glass</subject><subject>hardwood</subject><subject>Homogenizers</subject><subject>image analysis</subject><subject>Natural Materials</subject><subject>Organic Chemistry</subject><subject>Original Paper</subject><subject>Oxidation</subject><subject>Physical Chemistry</subject><subject>Polymer Sciences</subject><subject>Scanning electron microscopy</subject><subject>Shear</subject><subject>Sustainable Development</subject><subject>transmittance</subject><subject>viscosity</subject><issn>0969-0239</issn><issn>1572-882X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp9kU9LxDAQxYMouK5-AE8WPEcnabZNjrKsf2BlBRW8hSRN28jarEnVVfzwplTw5ilD5v3eMG8QOiZwRgDK80hgVgIGwjBQAni7gyZkVlLMOX3aRRMQhUidXOyjgxifAUCUlEzQd_Brm_k6a33oXO2M6p3vMtdlfWuzykXX9bYJ46-2rXp3_i0MwMPi9m6F_dZV7stWmV5bZdpUtCpUH95XWe10sHGwUlnrmhbH1qqQBr34xnYJCodor1braI9-3yl6vFw8zK_xcnV1M79YYpMz6HGtSq0LpjiHnFGbF6LgRhtOKFOiYpUiRheF0alBLXDDBBcUdM4ZNTPIRT5Fp6PvJvjXNxt7-ZyW6NJISelMCMKYIElFRpUJPsZga7kJ7kWFT0lADiHLMWSZQpZDyHKbGDoyMWm7xoY_5_-gkxGqlZeqCS7Kx3uaBOkqvCCkyH8AhSyJ9Q</recordid><startdate>20140601</startdate><enddate>20140601</enddate><creator>Kekäläinen, Kaarina</creator><creator>Liimatainen, Henrikki</creator><creator>Illikainen, Mirja</creator><creator>Maloney, Thad C</creator><creator>Niinimäki, Jouko</creator><general>Springer-Verlag</general><general>Springer Netherlands</general><general>Springer Nature B.V</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20140601</creationdate><title>role of hornification in the disintegration behaviour of TEMPO-oxidized bleached hardwood fibres in a high-shear homogenizer</title><author>Kekäläinen, Kaarina ; 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It was seen that hornification prior to TEMPO-mediated oxidation had a notable effect on the disintegration behaviour of bleached cellulose fibres in a high-shear homogenizer and on the properties of the resulting particles. Field-emission scanning electron microscopy imaging of the suspensions and viscosity and transmittance measurements revealed that never-dried oxidized fibres disintegrated into bunches of microfibrils and at higher charge densities into thinner and more individual microfibrils. These microfibrils were obtained from fibres through swelling and ballooning. The hornified fibres were mainly cut into shorter ones as the charge density increased. After reversing the hornification and allowing the fibres to swell further, however, microfibrils were also obtained from this source. 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| subjects | Bioorganic Chemistry Bleaching Cellulose fibers cellulosic fibers Ceramics Charge density Charge reversal Chemistry Chemistry and Materials Science Composites Disintegration Glass hardwood Homogenizers image analysis Natural Materials Organic Chemistry Original Paper Oxidation Physical Chemistry Polymer Sciences Scanning electron microscopy Shear Sustainable Development transmittance viscosity |
| title | role of hornification in the disintegration behaviour of TEMPO-oxidized bleached hardwood fibres in a high-shear homogenizer |
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