The spontaneous elongation of triacetate fibre

Fomenko, B.A.; Perepechkin, L. P.; Vasil'ev, B.V.; Naimark, N.I.

doi:10.1016/0032-3950(69)90455-9

Polymer Science U.S.S.R.

1969

DOI: 10.1016/0032-3950(69)90455-9

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The spontaneous elongation of triacetate fibre

B.A. Fomenko

L. P. Perepechkin

B.V. Vasil'ev

et al.

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Cited by 8 publications

(2 citation statements)

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“…The effect of spontaneous elongation of cellulose ether films and fibres in a medium of specific liquids [3][4][5] and fibres and plastics on attaining the glass transition temperature during linear heating of the polymer [6][7][8] was the first direct evidence of formation of a nematic phase by cellulose derivatives.…”

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confidence: 99%

The liquid-crystalline state of cellulose acetates: From past to present. Experience of the Saratov school

Shipovskaya

Timofeeva

2006

Fibre Chem

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Mesophasogenic solvents in the vapor state actively affect the structure of cellulose acetates of different morphological forms (fibre, film, bulk polymer). On the supramolecular level, this is manifested by initiation of orientation processes and on the conformational level by a change in the optical density, up to a change in the direction of rotation of the cholesteric helix to the opposite direction. The approach found creates conditions for formation of a given structure and three-dimensional organization of the polymer matrix for manufacture of materials with improved properties and new qualities.Of the large number of polysaccharides, cellulose and cellulose derivatives are the most important in the total production volume of polymeric materials for industrial and domestic applications. This class of macromolecular compounds has been actively studied up to now both to obtain fundamental knowledge and for their practical use.Domestic scientists specializing in polymer science have made an enormous contribution to the study of the structure, composition, and properties of cellulose and its ethers. They include the internationally known scientists

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confidence: 99%

The liquid-crystalline state of cellulose acetates: From past to present. Experience of the Saratov school

Shipovskaya

Timofeeva

2006

Fibre Chem

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“…This is an important observation, since the effect of elongation of dry-spun CTA fibres is not described in the literature. Only spontaneous elongation of wet-spun CTA fibres in nitromethane vapors (120-140%) [3] and insignificant elongation when the glass transition temperature was attained during linear heating (110-115%, in consideration of the initial length) were observed [23]. A feature of the effect of spontaneous elongation of CDA and CTA fibres in DMSO vapors, like CDA fibres in nitromethane vapors, is the kinetic reversibility of the process.…”

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confidence: 96%

Spontaneous elongation of acetate fibres in dimethyl sulfoxide vapors: dynamics, structure, energetics

et al. 2008

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The effect of a spontaneous change in the size (elongation-partial retraction) of di-and triacetate fibres in DMSO vapors in the 19-60°C range, accompanied by initiation of orientation events in the polymer matrix was detected. Sorption of DMSO vapors by the polymer in self-deformation of the acetate fibre does not obey Fick's law and is described by extremal swelling curves that indicate the multistage character of the reaction of the sorbate vapors with the polymer. The energetics of spontaneous elongation of cellulose acetate in DMSO vapors was investigated, and the specific work of self-deformation and "negative" longitudinal viscosity were determined. The values of the specific heat was typical of transitions from the isotropic to the LC state. It was found that the stereomeric structure of the polysaccharide changes during a cyclic change in the size of the fibre, confirmed by inversion of the specific optical rotation sign. The data obtained can be described in terms of phase and conformational transitions and the mechanism of reaction of the polymer with the solvent vapors forming the LC phase with it.The spontaneous elongation of acetate fibres and films under the effect of active media -an aqueous solution of phenol and nitromethane vapors -noted in [1][2][3][4][5] is considered one of the clearest visually observable effects of spontaneous orientation ordering of macrochains [6].Of these two systems, the acetate fibre-nitromethane vapors system has been investigated from different points of view [3][4][5][7][8][9]. Nitromethane is a mesophasogenic solvent in which cellulose acetates form a lyotropic liquid-crystalline (LC) phase [4,8,[10][11][12]. The specific reaction of the polymer with the solvent is followed in many new events and characteristics [3][4][5][7][8][9]. This is primarily the kinetic "reversibility" of the spontaneous change in the linear dimensions of an anisodiametric sample: after self-elongation in the same conditions, i.e., in nitromethane vapors, the elongated fibre returns to the initial linear dimensions [3,5]. This does not take place in hydrothermal elongation of cellulose acetates in water-phenol medium [1,2]. Directed optical anisotropy stable in time [4] that does not obey Fick's law, anomalous sorption [7,8], variation of the sign of the specific optical rotation within wide limits [4,5], the capacity of the cholesteric coil, for example, to pass from the rotating polarization plane to the right into levorotatory and vice versa [4,5,8], etc.Since spontaneous elongation of cellulose acetates occurred in solvent vapors and not in liquid medium (where both swelling and partial dissolution could have occurred), we found methods for a multistage study of the reaction of the polymer with the solvent and controlling the process. This also allowed solving practical problems [7,9,[13][14][15]. Thin (linear density of less than 3-4 tex) acetate fibres [7], viscose fibres with a new structure [13], fibres with elevated physicomechanical characteristics [9,14] and improved unevenness ...

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On the glass temperature of cellulose esters

Naimark

1973

Polymer Science U.S.S.R.

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The spontaneous elongation of triacetate fibre

Cited by 8 publications

References 8 publications

The liquid-crystalline state of cellulose acetates: From past to present. Experience of the Saratov school

The liquid-crystalline state of cellulose acetates: From past to present. Experience of the Saratov school

Spontaneous elongation of acetate fibres in dimethyl sulfoxide vapors: dynamics, structure, energetics

On the glass temperature of cellulose esters

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