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Internal Structure of Isolated Cellulose I Fibril Aggregates in the Water Swollen State
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
2017 (Engelska)Ingår i: Nanocelluloses: their preparation, properties, and applications / [ed] Agarwal, UP Atalla, RH Isogai, A, American Chemical Society (ACS), 2017, s. 91-112Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

By combining H-2-NMRD and CP/MAS C-13-NMR measurements of water-based cellulose gels and of water swollen pulps it was possible to estimate the nature of the interior structure of cellulose fibril aggregates. A set of samples with high cellulose purity and low charge was used. The interpretation of data was based on a relaxation model describing the exchange dynamics for deuterium exchange between water molecules and cellulose hydroxyl groups. The theoretical model used made it possible to calculate cellulose surface-to-volume ratios (q-values) from both H-2-NMRD and CP/MAS C-13-NMR data. Good consistency between H-2-NMRD and CP/MAS C-13-NMR data was found. In all investigated samples the cellulose fibril aggregates showed a different degree of "openness" interpreted as the presence of interstitial water inside fibril aggregates. One result also showed that an increased degree of fibril aggregate openness results from the TEMPO-oxidation. Common to all samples was that in the water swollen state water molecules could access part of the fibril aggregate interior.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2017. s. 91-112
Serie
ACS Symposium Series, ISSN 0097-6156 ; 1251
Nationell ämneskategori
Pappers-, massa- och fiberteknik Fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:umu:diva-143677DOI: 10.1021/bk-2017-1251.ch005ISI: 000417770800005ISBN: 978-0-8412-3218-1 (tryckt)ISBN: 978-0-8412-3217-4 (digital)OAI: oai:DiVA.org:umu-143677DiVA, id: diva2:1171018
Konferens
Anselme Payen Award Symposium in honor of Akira Isogai on Nanocelluloses, their Preparation, Properties and Applications / Spring ACS National Meeting, MAR 13-17, 2016, San Diego, CA
Tillgänglig från: 2018-01-05 Skapad: 2018-01-05 Senast uppdaterad: 2018-06-09Bibliografiskt granskad

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Westlund, Per-Olof

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