Zusammenhänge zwischen morphologischer Struktur und Kettenlänge bei nativen Zellulosefasern

Dolmetsch, H.; Franz, Erich; Correns, E.

doi:10.1007/bf01507717

Cited by 9 publications

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“…On the other hand, when the dipping time is relatively long (20 min), the entire cellulose fiber swells immediately following the addition of pyridine, and the helical structure can be seen particularly well in the center part of fiber along the fiber axis. Similar phenomena have been observed for greartly swollen cellulose when phosphoric acid, cuprammonium solution, 9 and cadoxene 10 were used. The regenerated cellulose including viscose and cuprammonium rayons neither swell nor dissolve in the D-C-P system.…”

Section: Screening Of the Effective Solventsupporting

confidence: 79%

Dissolution Process and Dissolved State of Cellulose in Dimethylformamide–Chloral–Pyridine System

Kamide

Okajima

Matsui

et al. 1980

Polym J

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The dissolution process and dissolved state of cellulose into a dimethylformamide-chloral-pyridine (D-C-P) system were studied by optical microscopy, nuclear magnetic resonance (NMR), polarimetry, infrared (IR) spectroscopy, and X-ray diffraction method. Natural cellulose with crystal form I dissolves rapidly at room temperature, via hemiacetaltype reaction with chloral, in which pyridine acts as a reaction accelerator. Cellulose exists as cellulose trichlorate in the mixture. When the pretreatment period of cellulose with dimethylformamide (DMF) is short, the cellulose dissolves into the system without swelling. But when the pretreatment period is relatively long, the cellulose swells considerably and then dissolves. Cellulose monochlorate was recovered by casting from the solution but cellulose trichlorate could not be isolated, probably because of the considerable tendency of the polymer to hydrolyze, especially when the solution is acidic. Cellulose having the crystal form II was regenerated by addition of water to the solution. KEY WORDS Cellulose Chlorate I Dissolution Process I Dissolved State I Dimethylformamide-Chloral-Pyridine System I

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Section: Screening Of the Effective Solventsupporting

confidence: 79%

Dissolution Process and Dissolved State of Cellulose in Dimethylformamide–Chloral–Pyridine System

Kamide

Okajima

Matsui

et al. 1980

Polym J

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Über den Vorgang des Spinnens bei der Erzeugung von Kunstfasern

Sippel¹

1944

Zeitschrift für Elektrochemie und angewandte physikalische Chem

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Un tersuchungen über den morphologischen und chemischen aufbau von holzcellulosefasern

Hass¹

1949

Makromol. Chem.

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urid Liisiiugs-Ersdieiiiiii!geIi voii I.Iolzcclluloscfascru vcrschicdcncr Hcrkunft in Sr?iwcfclsiiirc sowic von s a n t l~o g c a i c r t c~~ Fasern in Natronlaugc uiid acctylicrten Fasern in Eiscssig crgab sidi folgcndcs: Dic A II Q c 11 s c I i i c h t der sckundiircn Xellw;ind Ibestcht ails Holzpolyoscn. Sic kann init vcrdiinntcni K~~p f e r o x y d a~n i r~o~~i a l~, cincni spczifisdien LSsungsmittel fur Hiolzl)olyojcli, cntfcrnt wcrc!cn. Die I II II e n s c 11 i c h t clcr sckundiiren Zcllwand ]?esteht aus Siibstanzcn, die 'bei dcr Hydrolysc uncl Acctylicrmig in schwerliislidie Ver-I)indungcn von dcr Art dcr Znckerhuminc iihcrgchcn. Dic 31 i t I e 1 s c h i c h t der sckundiiren Zcllwand ist aufgcbaut aus Fibrillen, Laniellcn uncl clcr Qnerspirale. Dic in dcr Faserllngsrichtung ccrlaufcndcn Fibrillen sind bei Nadelliolzern auf dcr AuRenscitc voii Lignin umgcbcii, das dort wahrsdicinlidi niit dcr Ccllulosc dicmisdi' vcr-Inrndcn ist. Bci seiner Hcraueliisnng Itintcrl~leibt cine Scliiclit Ccllulosc von vcrindertcr RcaktionsfLIiiglcci~. Viclleidit sind audi schr frenidgruppciireiclie Celluloscn die Ansgangsprodiiktc dicses Lignins dcr Illittclsc4iidrt clcr sckrinclfren Zcllwand. Das widitigc Bauclemciit der Qnerspirale tritt bei Quellung dcr Fasern in konx. Sdrwefelsiiurc uninittclbar in Erscliciniing. Das Anftrctcn dcr Qucrspiral-SpaltflEchcn, dic insbcsonderc: bci saiircr Einwirkung crsdicincn, kann bedingt scin dnrcli Einlngcrung raschcr Iiydrolysicrcnder Vcr1)indiingen zwisclien dic Giinge clcr Qucrspiralc. Dabei kann cs sich nidit um Holzpolyosen Iiacidelir, die an clicscn Stcllcn der Fasern nicht vorkommcn. Dic Qucrspirnlsl~altflldien kSnnen alxr andl hervorgerufen sciu durch sdincllcr spaltendc Binclungcn, dic in den parallel angeordnetcn Holzcclluloscmolekiilen in ciner Ehene liegen. Ncbcii dcin m o r p h o 1 o g i s c h e 11 B s 11 dcr einzehien Fascrschichtcn sind cs vor allcm die Unterschiede in ihrer c h c m i s c h c 11 Z 11 s a in m e II s e t 1; 11 11 g, die das Verhalten der Fascrn hci Umsctznngen wie Xan~hogenierung uiid .4cetylicrung maRgebcnd becinff uRen.

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Zusammenhänge zwischen morphologischer Struktur und Kettenlänge bei nativen Zellulosefasern

Cited by 9 publications

References 0 publications

Dissolution Process and Dissolved State of Cellulose in Dimethylformamide–Chloral–Pyridine System

Dissolution Process and Dissolved State of Cellulose in Dimethylformamide–Chloral–Pyridine System

Über den Vorgang des Spinnens bei der Erzeugung von Kunstfasern

Un tersuchungen über den morphologischen und chemischen aufbau von holzcellulosefasern

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