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High-Temperature Behavior of Cellulose I
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Biokompositer. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.
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2011 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 115, nr 10, s. 2155-2166Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

molecular simulation to elucidate the structural behavior of small hydrated cellulose I beta microfibrils heated to 227 degrees C (500 K) with two carbohydrate force fields. In contrast to the characteristic two-dimensional hydrogen-bonded layer sheets present in the cellulose I beta crystal structure, we show that at high temperature a three-dimensional hydrogen bond network forms, made possible by hydroxymethyl groups changing conformation from trans-gauche (TG) to gauche-gauche (GG) in every second layer corresponding to "center" chains in cellulose I beta and from TG to gauche-trans (GT) in the "origin" layer. The presence of a regular three-dimensional hydrogen bond network between neighboring sheets eliminates the possibility of twist, whereas two-dimensional hydrogen bonding allows for microfibril twist to occur. Structural features of this high-temperature phase as determined by molecular simulation may explain several experimental observations for which no detailed structural basis has been offered. This includes an explanation for the observed temperature and crystal size dependence for the extent of hydrogen/deuterium exchange, and diffraction patterns of cellulose at high temperature.

Ort, förlag, år, upplaga, sidor
2011. Vol. 115, nr 10, s. 2155-2166
Nyckelord [en]
SYNCHROTRON X-RAY; NEUTRON FIBER DIFFRACTION; TRANSMISSION ELECTRON-MICROSCOPY; DILUTE-ACID PRETREATMENT; HYDROGEN-BONDING SYSTEM; MAIZE CELL-WALLS; MOLECULAR-DYNAMICS; NATIVE CELLULOSE; CRYSTALLINE CELLULOSE; THERMAL-EXPANSION
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Pappers-, massa- och fiberteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-31862DOI: 10.1021/jp1106839ISI: 000288113300004Scopus ID: 2-s2.0-79952599185OAI: oai:DiVA.org:kth-31862DiVA, id: diva2:408338
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QC 20110404

Tillgänglig från: 2011-04-04 Skapad: 2011-03-28 Senast uppdaterad: 2017-12-11Bibliografiskt granskad

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Bergenstråhle, Malin
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BiokompositerWallenberg Wood Science Center
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Journal of Physical Chemistry B
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