Solution properties of cellulose tris(3,5‐dimethyl‐phenylcarbamate)

Norisuye, Takashi; Tsuboi, Akihiko; Sato, Takahiro; Teŕamoto, Akio

doi:10.1002/masy.19971200109

Cited by 10 publications

(10 citation statements)

References 41 publications

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“…The resultant S 2  calc values are almost equivalent to the corresponding experimental S 2  z . Furthermore, the helix pitch per residue h defined as L/Nw was calculated to be 0.51  0.03 nm, which is substantially the same as those for CTPC in other solvents [10,11,41] and for the crystal structure of CTPC-2-butanone complex [42]. We may thus conclude that both S 2  z and P(q) data for CTPC in TCP are consistently explained by the wormlike chain model.…”

Section: Resultssupporting

confidence: 62%

Chain stiffness of cellulose tris(phenylcarbamate) in tricresyl phosphate (TCP)

2017

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Small-angle X-ray scattering (SAXS) measurements were carried out for two cellulose tris(phenylcarbamate) (CTPC) samples in tricresyl phosphate (TCP) at 25 C to determine the particle scattering function P(q) and the z-average mean-square radius of gyration S 2  z. The obtained data were analyzed in terms of the wormlike chain model to estimate the Kuhn segment length  −1 (the stiffness parameter, equivalent to twice the persistence length) and the helix pitch (or helix rise) per residue h. The resultant  −1 and h were 11.5  0.5 nm and 0.51 nm, respectively. While the latter value (h) is consistent with the previously reported values both for cellulose and cellulose derivatives, appreciably higher chain flexibility was found for CTPC in TCP than that in tetrahydrofuran at 25 C (19-24 nm). The value is fairly close to that in anisol, cyclohexanol, and benzophenone assuming an appropriate temperature coefficient. We may thus conclude that CTPC behaves as a semiflexible chain in TCP.

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Section: Resultssupporting

confidence: 62%

Chain stiffness of cellulose tris(phenylcarbamate) in tricresyl phosphate (TCP)

2017

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“…According to the latest investigation of CTPC, the chain stiffness parameter  −1 of the model (the Kuhn segment length or twice of the persistence length) was determined as 21 nm in tetrahydrofuran (THF) [6] and 16 nm in 1-methyl-2-pyrrolidone (NMP) [9]. Similar chain stiffness was also reported to be 16 nm in NMP for cellulose tris (3,5-dimethylphenylcarbamate) [10,11] which is widely used for chiral stationary phase for liquid chromatography [12,13].…”

Section: Introductionmentioning

confidence: 99%

Dimensional and hydrodynamic properties of cellulose tris(alkylcarbamate)s in solution: Side chain dependent conformation in tetrahydrofuran

Jiang

Ryoki

Terao

2017

Polymer

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We prepared cellulose tris(ethylcarbamate) (CTEC), cellulose tris(n-butylcarbamate) (CTBC), and cellulose tris(n-octadecylcarbamate) (CTODC) samples with different molecular weight to determine their conformational properties in dilute solution. Weight average molar masses Mw, z-average mean-square radii of gyration S 2 z, particle scattering functions P(q), and intrinsic viscosities [] of the CTEC, CTBC, and CTODC samples in tetrahydrofuran (THF) at 25 C were determined by size exclusion chromatography equipped with multi-angle light scattering detectors (SEC-MALS), small angle X-ray scattering (SAXS), and viscometry. Infrared (IR) absorption measurements were also made to observe intramolecular hydrogen bonding between C=O and NH groups. The obtained S 2 z, P(q), and [] data were analyzed in terms of the wormlike chain model to determine the Kuhn segment length (stiffness parameter, or twice of the persistence length)  −1 and the helix pitch (rise) per residue h. While CTBC has the highest chain stiffness in the three cellulose derivatives as in the case of the corresponding amylose derivatives, the difference in the wormlike chain parameters is less significant for the cellulose alkylcarbamate derivatives. Indeed, intramolecular hydrogen bonding of CTEC, CTBC, and CTODC is weaker and fewer than that for the corresponding amylose derivatives owing to the main chain linkage,  or .

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Section: Resultsmentioning

confidence: 99%

“…Numerous cholesteric phases of cellulose derivatives, especially cellulose tricarbanilates (CTC), as highly concentrated solutions were already described in literature. [ 10,15,16,23,24 ] For the beginning, we resynthesized the CTC described by Müller. [ 15 ] Starting from Avicell PH101 cellulose, we obtained the CTC by converting the cellulose with 3-(trifl uoromethyl) phenyl isocyanate (see Figure 1 ).…”

Section: State Of the Artmentioning

confidence: 99%

High Optical Quality Films of Liquid Crystalline Cellulose Derivatives in Acrylates

Wenzlik

Zentel

2013

Macro Chemistry & Physics

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Cholesteric liquid crystals based on polymers are attractive because of their film‐forming properties. However, their optical properties (sharpness and directionality of the selective reflection) are usually lower than low molar mass compounds because of a polydomain structure and an angular distribution of the helix axes. In this work, cholesteric films made of liquid crystalline cellulose derivatives with improved optical properties are prepared. The careful choice of the solvent, hydrogen bond influencing additives, the synthetic realization of a very high degree of substitution on the cellulosic polymer, and the use of mechanical stirring in combination with a tuned substrate treatment and film‐preparation method and subsequent polymerization allow the fabrication of free standing cholesteric films of high optical quality. They show selective reflection with a half width of only 25 nm and nearly only perpendicular reflection. In addition, a method is developed by which fluorescent dyes can be introduced into the films after their preparation.

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Solution properties of cellulose tris(3,5‐dimethyl‐phenylcarbamate)

Cited by 10 publications

References 41 publications

Chain stiffness of cellulose tris(phenylcarbamate) in tricresyl phosphate (TCP)

Chain stiffness of cellulose tris(phenylcarbamate) in tricresyl phosphate (TCP)

Dimensional and hydrodynamic properties of cellulose tris(alkylcarbamate)s in solution: Side chain dependent conformation in tetrahydrofuran

High Optical Quality Films of Liquid Crystalline Cellulose Derivatives in Acrylates

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