The thermal expansion of cellulose II and IIIII crystals

Hori, Ryusuke; Wada, Masahisa

doi:10.1007/s10570-005-9038-8

Cited by 59 publications

(49 citation statements)

References 31 publications

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“…This procedure was repeated three times with 3 M NaOH. After water washing, the mercerized ramie sample was vacuum-dried overnight (Langan et al 2001;Hori and Wada 2006).…”

Section: Methodsmentioning

confidence: 99%

Stoichiometry and stability of cellulose-hydrazine complexes

Kimura

Wada

et al. 2011

Cellulose

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Highly crystalline cellulose samples from green algae (cellulose I) and mercerized ramie (cellulose II) were treated with anhydrous hydrazine and the resulting complexes were analyzed by synchrotron X-ray diffraction and thermogravimetry. Cellulose I-hydrazine complex could be fully described by a two-chain monoclinic unit cell, a = 0.879 nm, b = 1.076 nm, c = 1.038 nm, and c = 122.0°, with space group P2 1 . Cellulose II-hydrazine complex prepared from mercerized ramie gave a different two-chain monoclinic unit cell, a = 1.042 nm, b = 1.046 nm, c = 1.038 nm, c = 129.7°, also with space group P2 1 . Though having different crystal structures, the number of hydrazine molecules per glucopyranoside residue was 0.82 for cellulose I-complex and 0.93 for cellulose II-complex, probable stoichiometric value of 1.0. Hydrazine could be extracted from the complexes by organic solvents retaining the crystalline orders, resulting in the allomorphic conversion to cellulose III I and cellulose III II , both having non-staggered chain arrangements. These features are similar to those of celluloseethylenediamine complexes.

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“…This procedure was repeated three times with 3 M NaOH. After water washing, the mercerized ramie sample was vacuum-dried overnight (Langan et al 2001;Hori and Wada 2006).…”

Section: Methodsmentioning

confidence: 99%

Stoichiometry and stability of cellulose-hydrazine complexes

Kimura

Wada

et al. 2011

Cellulose

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“…The diffraction intensities clearly increased with the film density and thus the crystallinity of cellulose II as well as the film density is controllable by controlling the drying conditions. In particular, because the diffraction intensity of the (1 -1 0) peak significantly increased with film density, the drying conditions are likely to control the regularity between hydrophilic interactions between cellulose chains of cellulose II, maintaining a similar hydrophobic chain stacking regularity (Hori and Wada 2006).…”

Section: Properties Of Cellulose Filmsmentioning

confidence: 99%

Improvement of mechanical and oxygen barrier properties of cellulose films by controlling drying conditions of regenerated cellulose hydrogels

et al. 2012

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Mechanical, thermal and oxygen barrier properties of regenerated cellulose films prepared from aqueous cellulose/alkali/urea solutions can be markedly improved by controlling the drying conditions of the films. By pre-pressing followed by vacuum drying under compression, the tensile strength, Young's modulus, coefficient of thermal expansion and oxygen permeability of the dried films reached 263 MPa, 7.3 GPa, 10.3 ppm K -1 and 0.0007 ml lm m -2 day -1 kPa -1 , respectively. Thus, films produced in this way show the highest performance of regenerated cellulose films with no orientation of cellulose chains reported to date. These improved properties are accompanied by a clear increase in cellulose II crystallinity from 50 to 62% during pre-pressing/press-vacuum drying process. At the same time, the film density increased from 1.45 to 1.57 g cm -3 , and the moisture content under equilibrium conditions decreased from 14.1 to 9.8%. Hence, the aqueous alkali/urea solvent system has potential applications in producing new and environmentally friendly cellulose films with high performances through control of the drying conditions.

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“…A bundle of ramie fibers (cellulose I) was aligned and fixed to a stainless steel stretching device, which was then immersed in a 3.5N NaOH solution to prepare the Na-cellulose I. The Na-cellulose IV and cellulose II samples were prepared using a repetitive alkali mercerization process with stretching of the fibers, as reported in previous publications (Hori & Wada, 2006;Langan et al, 2001). After thoroughly washing the alkali solutions with deionized water, the samples were either kept in water at room temperature or dried in air to form Na-cellulose IV or cellulose II, respectively.…”

Section: Preparation Of Samplesmentioning

confidence: 99%