Nanocellulose Polymer Nanocomposites 2014
DOI: 10.1002/9781118872246.ch14
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Processes in Cellulose Derivative Structures

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Cited by 6 publications
(10 citation statements)
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“…Broad monosignate CD bands due to n -π * transition from alkyl esters of CABu and CTA thin films appeared at ~215 nm with (+)-sign and ~205 nm with (–)-sign, respectively (Guo et al, 2018 ). These (+)-and (–)-sign CD bands at 205 and 215 nm in the solid film reflect from left-handed helicity of CABu and right-handed helicity of CTA in solutions, respectively (Dubois et al, 1998 ; Onofrei et al, 2015 ), though CABu and CTA are β-(1 → 4) linked polymers made of D -glucose framework as a common repeating unit.…”
Section: Resultsmentioning
confidence: 99%
“…Broad monosignate CD bands due to n -π * transition from alkyl esters of CABu and CTA thin films appeared at ~215 nm with (+)-sign and ~205 nm with (–)-sign, respectively (Guo et al, 2018 ). These (+)-and (–)-sign CD bands at 205 and 215 nm in the solid film reflect from left-handed helicity of CABu and right-handed helicity of CTA in solutions, respectively (Dubois et al, 1998 ; Onofrei et al, 2015 ), though CABu and CTA are β-(1 → 4) linked polymers made of D -glucose framework as a common repeating unit.…”
Section: Resultsmentioning
confidence: 99%
“…For comparison, with respect to the ground-state chirality in the CABu film, the UV–vis and CD spectra at the S 0 → S 1 transitions of Trimer, Heptamer, and PF6 and, for comparison, those of Monomer, Dimer, Pentamer, and PF8 are shown in Figure a and Figure S2a, respectively. Similarly, the right -hand helicity , and/or d -glucose chirality of CABu efficiently transferred to these fluorenes. The bisignate CD profiles associated with the (+)- and (−)-signs at the first and second Cotton bands in CABu are quite similar to those in the CTA films, except for those of Monomer, PF6, and PF8 for unknown reasons.…”
Section: Results and Discussionmentioning
confidence: 96%
“…These induced CD signals from all of the fluorene derivatives clearly demonstrate that the efficient induction of d -β-glucose chirality and/or its main chain helicity is possible in a family of achiral (or CD-silent) fluorene derivatives via intermolecular interactions. Given that CTA, which possesses five chiral centers per pyranose ring, prefers left -handed helicity in dilute CHCl 3 , we assumed that the three acetate groups per pyranose attached to these chiral centers provided the fluorenes with chirality/helicity transfer capability. Although the acetate groups have no chirality individually, their restricted rotational freedom along the C–O–C and C–C–O–C bonds (Chart , shown as red bold lines for CTA) is expected lead to the twisted geometry of the fluorene main chain in a preferred screw sense, as proven by the bisignate CD spectra. , …”
Section: Results and Discussionmentioning
confidence: 99%
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“…On the Chart 1. Chemical Structures of Cellulose Triphenylcarbamate (CTPC), 9,9-Di-n-hexylfluorene Trimer (F3), 9,9-Di-nhexylfluorene Pentamer (F5), 9,9-Di-n-hexylfluorene heptamer (F7), Poly(9,9-di-n-hexylfluorene) (PF6), Poly(9,9-di-noctylfluorene) (PF8), Poly(9,9-di-n-octylfluorene-alt-ethynylene) (PF8E), Poly(9,9-di-n-octylfluorene-alt-bithiophene) (PF8T2), and Poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (PF8BT) a other hand, CTA and CABu film casting from their CHCl 3 solutions showed (−)-and (+)-sign CD spectral profiles (Figure S3a) arising from the CTA prevailing right-hand helix and CABu prevailing left-hand helix in solutions, 19,20 respectively. CTPC is a single polymer chirality platform but has bistability of helix sense in lyotropic liquid crystalline phase.…”
Section: ■ Results and Discussionmentioning
confidence: 99%