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Greiner, Andreas; Hou, Haoqing; Reuning, Arndt; Thomas, Arne; Wendorff, Joachim H.; Zimmermann, Steffen

doi:10.1023/a:1023038303103

Cited by 14 publications

(9 citation statements)

References 44 publications

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“…Investigation of the lyotropic liquid crystalline (LC) properties of macromolecules which are long enough to observe optically has a potential significance in self‐orientation of the biological materials. Most plants have giant polysaccharides, celluloses, whose derivatives have been widely studied as LC polymers and it has been reported that the LC structure in plant cell walls composed mainly of cellulose fibers with a high orientation degree may play a role in supporting the plant bodies . DNA, which are representative megamolecules, could form LC structures to store themselves in chromosomes efficiently according to the literaure …”

Section: Extraction and Properties Of Cyanobacterial Polysaccharidesmentioning

confidence: 99%

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Okajima

Sornkamnerd

Kaneko

2018

The Chemical Record

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Cyanobacteria are regarded as very eco-friendly microreactors for the production of various biomolecules such as polysaccharides by fixing not only carbon but also nitrogen in water. Cyanobacterial polysaccharides having various functional groups such as hydroxyls, carboxyls, sulfates, etc. have the ability to interact with metals or inorganics, to create bionanocomposites. Sacran, a supergiant cyanobacterial anionic polysaccharide extracted from the extracellular matrix of Aphanothece sacrum which is mass-cultivated in freshwater, is mainly used to create functional bionanocomposites. Gel-type bionanocomposites of sacran with various metal cations are formed and showed photoresponsive functions. Metal recovery is performed from the sacran bionanocomposite gels. Sacran chains are complexed with multi-wall carbon nanotubes (MWCNT) to give viscose dispersion from which MWCNT bionanocomposites can be collected by electrophoresis. The MWCNT/sacran dispersion retains the capability of adsorbing various metal ions to form hardened hydrogel beads. Finally, natural inorganic sepiolite can be used for sacran bionanocomposites which show an efficient neodymium ion adsorption ability. Thus, cyanobacterial polysaccharides are useful for preparing eco-friendly and functional bionanocomposites with various hard materials.

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Section: Extraction and Properties Of Cyanobacterial Polysaccharidesmentioning

confidence: 99%

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Okajima

Sornkamnerd

Kaneko

2018

The Chemical Record

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“…1 1 H-NMR spectra of HPC-MTP (top) and HPC (bottom) in CDCl 3 . The structure for HPC-MTP is idealized with a degree of etherification of three 25 and a degree of esterification of 3. chains. 35 This result indicated an alignment of the single polymer chains.…”

Section: Chemical and Physical Properties Of Hpc-mtpmentioning

confidence: 99%

“…The synthesis via esterification should be an easy one-step reaction and should not lead to chain degradation 23,24 or cross-linking. 25 HPC instead of pure cellulose was selected for the functionalization with thioethers due to its better solubility. The short thioether side groups were introduced via esterification with 3-methylthiopropionyl chloride.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of liquid crystalline thioether-functionalized hydroxypropyl cellulose esters

Ohlendorf

Greiner

2015

Polym. Chem.

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“…Esterification is one of the facile means to exploit the hydroxy groups present in cellulose derivatives, and has been the most commonly used synthetic approach leading towards the preparation of cellulose‐based materials capable of exhibiting cholesteric LC phase transitions 31–38. Although the amino acid‐containing polymers have engrossed substantial prominence as a new class of bioactive polymeric materials,11–30 no significant research endeavor concerning the amino acid functionalization of cellulose derivatives has been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of amino acid esters of hydroxypropyl cellulose

Khan

Shiotsuki

Sanda

et al. 2008

J. Polym. Sci. A Polym. Chem.

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The amino acid esters of hydroxypropyl cellulose (HPC) [R′ = H (2a), CH3 (2b), CH2CH(CH3)2 (2c), CH2CONH2 (2d), CH2CH2CONH2 (2e), CH2CH2CH2CH2 NHOCOC(CH3)3 (2f)] were synthesized in good yield by the reaction of t‐butoxycarbonyl (t‐Boc)‐protected amino acids with hydroxy groups of HPC (1; molar substitution (MS), 4.61). The amino acid functionalities displaying varied chemical nature, shape, and bulk were utilized and the bulk of the substituent on the α‐carbon of amino acids was elucidated to be of vital significance for the observed degree of incorporation (DSEst). The 1H NMR spectra and elemental analysis were employed to determine the degree of incorporation of amino acid moiety (DSEst) and almost complete substitution of the hydroxy protons was revealed for 2a, 2b, and 2f. The presence of the peaks characteristic of the carbonyl group in the FTIR spectra furnished further evidence for the successful esterification of HPC. The starting as well as the resulting polymers (1 and 2a–f) were soluble in polar organic solvents; however, the esterification of 1 with bulky organic moieties resulted in an increased hydrophobicity as all of the amino acid‐functionalized polymers (2a–f) were insoluble in water. The onset temperatures of weight loss of 2a–f were 175–230 °C, indicating fair thermal stability. The amino acid functionalization led to the enhanced polymer chain stiffness, and the glass transition temperatures of the derivatized polymers were 30–40 °C higher than that of 1 (Tg 3.9 °C; cf. Tg of 2a–f, 35.1–43.3 °C). © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 2326–2334, 2008

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Untitled

Cited by 14 publications

References 44 publications

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Synthesis of liquid crystalline thioether-functionalized hydroxypropyl cellulose esters

Synthesis and properties of amino acid esters of hydroxypropyl cellulose

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