Influence of hydrogen bonds on glass transition and dielectric relaxations of cellulose

Roig, Frédéric; Dantras, Éric; Dandurand, Jany; Lacabanne, C.

doi:10.1088/0022-3727/44/4/045403

Cited by 61 publications

(52 citation statements)

References 52 publications

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“…These two relaxation modes have been resolved experimentally in a series of elementary thermograms revealing the existence of a discrete distribution of relaxation times. According to the literature, the c relaxation mode of cellulose has been attributed to molecular mobility of Roig et al 2011a) and the b relaxation mode of cellulose to molecular mobility of glycosidic rings thanks to b 1-4 glycosidic bonds (Saad et al 1996;Saad and Furuhata 1997;Einfeldt et al 2000aEinfeldt et al , b, 2001Einfeldt et al , 2003Einfeldt et al , 2004Einfeldt and Kwasniewski 2002;Meissner et al 2000;Jafarpour et al 2007Jafarpour et al , 2009). Lignin has also been studied by TSC in the low temperature range.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric and mechanical properties of various species of Madagascan woods

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Abstract The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents-cellulose and lignin-as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-frequency analysis was carried out by thermostimulated current technique. Low-temperature relaxations of rosewood were assigned to low-temperature relaxations of cellulose. There was no dielectric response of lignin in rosewood. Contrarily, both cellulose and lignin responses were distinguished in ebony and varongy. Thermostimulated currents analyses exhibit the specific behavior of lignin in the various wood species. Moreover, the relaxation mode of cellulose observed at lower temperature remains localized in rosewood, while it tends to delocalize in varongy and ebony. The nature and intensity of physical interactions that induce variation of phase miscibility might be responsible for the observed differences. Even at the scale of the c relaxation, physical interactions modify molecular mobility.

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Section: Resultsmentioning

confidence: 99%

“…If the molecular origin of c Cellulose mode is clear, the one of b Cellulose relaxation has been a subject of controversy. Nowadays, b Cellulose is associated with the molecular mobility of glycosidic rings thanks to b 1-4 glycosidic bonds (Meissner et al 2000;Roig et al 2011a).…”

Section: B Ligninmentioning

confidence: 99%

Dielectric and mechanical properties of various species of Madagascan woods

et al. 2017

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“…Therefore, a dielectric loss peak represents a state when the chain mobility does not match the alternation of the applied electric field. The dielectric properties of cellulose have been extensively investigated (Jafarpour et al 2007;Rachocki et al 2005;Roig et al 2011). The peak of the dielectric loss at low temperature is usually assigned to Fig.…”

Section: Temperature Dependent Dielectric Spectroscopymentioning

confidence: 99%

“…The black cross is a marker to locate the imaging region before and after straining Fig. 8 Strain rate and temperature dependence of the normalized yield stress of cellulose nanopaper, indicating that the yield stress increases with increasing strain rate and decreasing temperature secondary relaxation while the one at higher temperature is attributed to primary relaxation or specifically the dielectric manifestation of the glass transition (Roig et al 2011).…”

Section: Temperature Dependent Dielectric Spectroscopymentioning

confidence: 99%

Toughening mechanisms in cellulose nanopaper: the contribution of amorphous regions

Mao

Meng

et al. 2017

Cellulose

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Cellulose nanopaper is a strong and tough fibrous network composed of hydrogen bonded cellulose nanofibres. Upon loading, cellulose nanopaper exhibits a long inelastic portion of the stress-strain curve which imparts high toughness into the material. Toughening mechanisms in cellulose nanopaper have been studied in the past but mechanisms proposed were often rather speculative. In this paper, we aim to study potential toughening mechanisms in a systematic manner at multiple hierarchical levels in cellulose nanopaper. It was proposed that the toughness of cellulose nanopaper is not, as is often assumed, entirely caused by large scale inter-fibre slippage and reorientation of cellulose nanofibres. Here it is suggested that dominant toughening mechanism in cellulose nanopaper is associated with segmental motion of molecules facilitated by the breakage of hydrogen bonds within amorphous regions .

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“…Dielectric relaxation spectroscopy (DRS) can be used to investigate molecular motions in a wide frequency range. DRS studies on different polysaccharides have been reported in the literature, but mainly for secondary relaxations (Einfeldt, Meibner, & Kwasniewski, 2001;Jafarpour, Dantras, Boudet, & Lacabanne, 2007;Kaminski et al, 2009;Kusumi, Teramoto, & Nishio, 2011;McBrierty, Keely, Coyle, Xu, & Vij, 1996;Roig, Dantras, Dandurand, & Lacabanne, 2011;Seymour, Weinhold, & Haynes, 1979;Sousa, Bras, Veiga, & Ferreira, http://dx.doi.org/10.1016/j.carbpol.2014.078 0144-8617/© 2014 Elsevier Ltd. All rights reserved. 2010).…”

Section: Introductionmentioning

confidence: 99%