Influence of Precipitation and Conditioning Baths on the Structure, Morphology, and Properties of Cellulose Films

Makarov, Igor; Голова, Л. К.; Kuznetsova, L. K.; Антонов, С. В.; Kotsyuk, A. V.; Ignatenko, V. Ya.; Куличихин, В. Г.

doi:10.1007/s10692-017-9786-x

Cited by 10 publications

(11 citation statements)

References 15 publications

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“…As is seen in the photos, the film washed in IPA is turbid and only after holding such a film in water and drying it becomes transparent. Changes in the optical properties of the film can be associated with both structural and morphological features [19,[39][40][41] and the presence of a residual solvent [33]. The study of the chemical composition by elemental analysis showed that the nitrogen content in the film formed and washed in IPA is about 0.5%.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, water is a relatively stiff coagulant for cellulose solutions, and it could be "softened" by adding NMMO, i.e., using the dilute solution of a solvent in a coagulant [18]. As a result, the materials spun in such bathes have different morphology and structure compared with materials processed via fast coagulation, which affects the set of mechanical characteristics [19,20]. An increase in the temperature of the coagulation bath containing an aqueous solution of NMMO to 80 • C upon spinning of 8% cellulose solutions leads to a decrease in the thickness of the dense surface shell but with the appearance of a number of defects [21].…”

Section: Introductionmentioning

confidence: 99%

“…The system of hydrogen bonds and, as a result, the structure of the material changes drastically, since a less ordered structure is formed than in water [23]. When the fresh-spun material is additionally washed with water, its density increases (due to growth of crystallinity) and even exceeds similar values for samples formed in water [19,29]. In this case, we are talking about a two-stage formation of the material structure by the primary interaction of the solution with alcohol and, finally, with water.…”

Section: Introductionmentioning

confidence: 99%

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A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

et al. 2020

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Replacing the aqueous coagulation bath with an alcoholic one during spinning cellulose fibers (films) from solutions in N-methylmorpholine-N-oxide leads to a radical restructuring of the hydrogen bonds net of cellulose and, as a result, to a change in the structure and properties of the resulting material. By the method of optical interferometry, it was possible to identify the intrinsic features of the interaction of the solvent and isomeric alcohols and to construct phase diagrams of binary systems describing the crystalline equilibrium. Knowledge of the phase states of the system at different temperatures renders it possible to exclude the process of solvent crystallization and conduct the spinning in pseudo-homogeneous conditions. The structure and morphology of samples were studied using X-ray diffraction and scanning electron microscopy methods for a specific coagulant. When the solution under certain conditions is coagulated at contact with alcohol, the solvent may be in a glassy state, whereas, when at coagulation in water, an amorphous-crystalline structure is formed. The structural features of cellulose films obtained by coagulation of solutions with water and alcohols help to select potential engineering or functional materials (textile, packaging, membranes, etc.), in which their qualities will manifest to the best extent.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

et al. 2020

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“…The selection of an appropriate coagulant plays very important role in fiber spinning because it controls the structure and morphology of the obtained fibers [7,8,9] and films [10]. Morphology evolution of solution droplet surrounded by a coagulant was studied (modeling the jet/fiber cross-section) through microscopic methods.…”

Section: Methodsmentioning

confidence: 99%

New Approach to Preparation of Heat-Resistant “Lola-M” Fiber

et al. 2019

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A new approach to the synthesis of polynaphthoylenebenzimidazoles and heat resistant fiber spinning has been developed using an environmentally friendly and energy efficient method, which operates with solutions of pre-polymers based on 3,3’,4,4’-tetraaminodiphenyl ether and 1,4,5,8-naphthalenetetracarboxylic acid dianhydride in N-methylpyrrolidone. Rheological properties of polymer reaction solutions and appropriate coagulant mixtures were investigated for further wet spinning process. The coagulation process was investigated through microscopic observation of solution droplets which imitate jet/fiber cross section surrounded with coagulants of different composition. For the case of the most optimal viscoelastic properties of dopes the best coagulant was found to be a ternary mixture ethanol/water/NMP (20/10/70). Fibers were prepared through the wet spinning from pre-polymers of various molecular weight characterized by intrinsic viscosity. As a result, complex yarns were spun, and their morphology was characterized and mechanical properties were measured. The strength of ~300 MPa and elastic modulus of ~2 GPa and elongation at break of ~20% were reached for the best fibers at average diameter of ~20 µm. After heat treatment “Lola-M” fibers do not burn and do not support combustion in open flame.

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“…The main peak characterizing betulin (~14.5 • ) is expressed as the right shoulder of the cellulose peak in the region of 2θ~12 • [24]. The basic basal reflexes practically did not change their position when the additive was added to the cellulose matrix and appear in the region of 2θ~12 • and~20.5 • , which corresponds to the cellulose polymorph II [25,26].…”

Section: Structurementioning

confidence: 99%

Antifungal Composite Fibers Based on Cellulose and Betulin

Makarov

Vinogradov

Громовых

et al. 2018

Fibers

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Composite fibers and films based on cellulose and betulin were spun for the first time from solutions in N-methylmorpholine-N-oxide using the dry-wet jet method. The rheological properties of the composite solutions did not reveal any fundamental difference from those of the cellulose solutions. Introduction of betulin into the cellulose matrix (up to 10%) led to a decrease in the mechanical properties of the obtained fibers. The structure of the composite fibers was analyzed using SEM and X-ray diffraction methods. It was shown that the introduction of an additive into the cellulose matrix led to a decrease in the structural ordering of the cellulose. Comparative studies of the antibacterial activity of the composite films on Escherichia coli (E. coli) were carried out. The antifungal activity of the composite films was estimated using the strain of the O-97 Trichoderma viride Pers ex Fr

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Influence of Precipitation and Conditioning Baths on the Structure, Morphology, and Properties of Cellulose Films

Cited by 10 publications

References 15 publications

A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

New Approach to Preparation of Heat-Resistant “Lola-M” Fiber

Antifungal Composite Fibers Based on Cellulose and Betulin

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