caa a22 4500 445384468 CHVBK 20180317143027.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10924-010-0207-y doi (NATIONALLICENCE)springer-10.1007/s10924-010-0207-y Valorisation of Vegetal Wastes as a Source of Cellulose and Cellulose Derivatives [Elektronische Daten] [R. Khiari, M. Mhenni, M. Belgacem, E. Mauret] Different qualities of CMC were prepared from an agricultural residue (date palm rachis) and a marine waste (Posidonia oceanica). These starting lignocellulosic materials were used as such and after chemical pulping and bleaching. The carboxymethylation reaction was carried out in presence of NaOH (40%) and monochloroacetic acid (ClCH2COOH, MAC), in n-butanol as the reaction solvent. The substitution degrees (DS) of the obtained CMCs varied from 0.67 to 1.62 and between 0.98 and 1.86, for P. oceanica and date palm rachis, respectively. The CP-MAS 13C-NMR spectra of the prepared polyelectrolytes displayed the presence of the main peaks associated with cellulose macromolecules (C1-C6) and that corresponding to carboxyl functions at around 175ppm. Unfortunately, the peak attributed to methylene groups neighbouring carboxyl moieties are overlapped by C2 and C3, which renders them hardly detectable. Nevertheless, it is worth noting that the CP-MAS 13C-NMR spectra revealed the presence of different signals originating from residual impurities (ca. 27ppm), such as traces of lignin macromolecules (110-150ppm) and methyl groups attributed to hemicelluloses. Work is in progress to establish a more efficient purification procedure, in order to have more accurate values of DS. Springer Science+Business Media, LLC, 2010 Posidonia oceanica nationallicence Date palm rachis nationallicence Cellulose nationallicence Carboxymethylcellulose nationallicence CPMAS 13C-NMR nationallicence Khiari R. Research Unity of Applied Chemistry and Environment, FSM-Monastir, Monastir, Tunisia aut Mhenni M. Research Unity of Applied Chemistry and Environment, FSM-Monastir, Monastir, Tunisia aut Belgacem M. Laboratoire de Génie des Procédés Papetiers UMR CNRS 5518, Grenoble INP-Pagora, 461 Rue de la Papeterie-BP 65, 38402, Saint Martin d'Hères Cedex, France aut Mauret E. Laboratoire de Génie des Procédés Papetiers UMR CNRS 5518, Grenoble INP-Pagora, 461 Rue de la Papeterie-BP 65, 38402, Saint Martin d'Hères Cedex, France aut Journal of Polymers and the Environment Springer US; http://www.springer-ny.com 19/1(2011-03-01), 80-89 1566-2543 19:1<80 2011 19 10924 https://doi.org/10.1007/s10924-010-0207-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10924-010-0207-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khiari R. Research Unity of Applied Chemistry and Environment, FSM-Monastir, Monastir, Tunisia aut NATIONALLICENCE 700 1- Mhenni M. Research Unity of Applied Chemistry and Environment, FSM-Monastir, Monastir, Tunisia aut NATIONALLICENCE 700 1- Belgacem M. Laboratoire de Génie des Procédés Papetiers UMR CNRS 5518, Grenoble INP-Pagora, 461 Rue de la Papeterie-BP 65, 38402, Saint Martin d'Hères Cedex, France aut NATIONALLICENCE 700 1- Mauret E. Laboratoire de Génie des Procédés Papetiers UMR CNRS 5518, Grenoble INP-Pagora, 461 Rue de la Papeterie-BP 65, 38402, Saint Martin d'Hères Cedex, France aut NATIONALLICENCE 773 0- Journal of Polymers and the Environment Springer US; http://www.springer-ny.com 19/1(2011-03-01), 80-89 1566-2543 19:1<80 2011 19 10924 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer