Untitled

Калашник, А. Т.; Panichkina, O. N.; Serkov, A. T.; Budnitskii, G. A.

doi:10.1023/a:1022999822618

Fibre Chemistry

2002

DOI: 10.1023/a:1022999822618

|View full text |Cite

Untitled

А. Т. Калашник

O. N. Panichkina

A. T. Serkov

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2004

2022

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Diffusion of water into the spinning solution jet takes place at a higher rate than diffusion of NaSCN into the spinning bath. This initially causes slight swelling of the spun gel fibre and then insignificant compaction of its structure (before leaving the spinning bath).The two-phase character of the structure of PAN fibres not treated with heat was hypothesized in [6][7][8]. Heating PAN fibres above the glass transition temperature (T g ) intensifies relaxation processes that lead to transition of amorphous regions in the polymer substrate to a more ordered mesophase.…”

mentioning

confidence: 99%

“…The two-phase character of the structure of PAN fibres not treated with heat was hypothesized in [6][7][8]. Heating PAN fibres above the glass transition temperature (T g ) intensifies relaxation processes that lead to transition of amorphous regions in the polymer substrate to a more ordered mesophase.…”

mentioning

confidence: 99%

“…According to the data in [6][7][8], the structure of PAN fibres is biphasic and includes amorphous and mesomorphic (liquid-crystalline) regions. When PAN is heated to 150°C, total devitrification of the polymer substrate (T g,1 ) takes place.…”

mentioning

confidence: 99%

“…When PAN is heated to 150°C, total devitrification of the polymer substrate (T g,1 ) takes place. At approximately 100°C, self-ordering of the structural elements of the polymer substrate with formation of a mesophase (T g,2 ) is intensified [7,8].…”

mentioning

confidence: 99%

“…In the 130-250°C temperature range, the deformability of PAN fibres increases significantly [8]. Heating above 130°C causes chemical changes in the polymer substrate and in particular, polycyclization.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Experimental study of the structure of polyacrylonitrile gel fibres

2004

View full text Add to dashboard Cite

The structure of PAN gel fibres spun by the water-thiocyanate method is investigated. It is shown that in identical spinning conditions, the packing density of the structural elements in gel fibres based on poly(ANco-MA-co-ItA) terpolymer is lower than in gel fibres based on poly(AN-co-MA-co-AMPS). A structural model of PAN gel fibre is proposed and substantiated. It is shown that the lower packing density of the structural elements in PAN gel fibres is responsible for the higher sorption power with respect to different inorganic and organic compounds and higher rate of polymer-analog transformations.The important amount of scientific and technical information accumulated in this area suggests that the structural and mechanical properties of polyacrylonitrile (PAN) fibres used both directly in fabrication of textiles and as precursors for manufacture of carbon and chemisorption fibres are predetermined by the primary structure and molecular-weight characteristics of fibre-forming copolymers and the spinning conditions.The basic industrial methods of fabrication of PAN fibres are different versions of wet spinning based on terpolymers of acrylonitrile (90-93 wt. %) with comonomers containing ester (5-8%) and acid (1-2%) functional groups. The structure of wet spun fibres after washing up to heat treatments (drying, thermofixation, hot drawing) is modeled by oriented gels that include water. The specific surface area (S sp ) of these gel fibres and ordering of their structural elements are determined by the conditions of realization of phase transitions during spinning and plasticization drawing [1].The study of the structural features of gel fibres of the composition poly[acrylonitrile(92.3%)-co-methyl acrylate(6.4%)-co-itaconic acid (1.3%)] spun with the water-dimethylformamide and water-thiocyanate methods in identical conditions of orientation drawing showed that spinning using hydrotropic solvents (for example, 51.5% aqueous solution of NaSCN) produces looser packing of the structural elements of the gel fibres than when aprotic solvents are used [for example, dimethylformamide (DMF)] [2]. The kinetics of fibre formation in manufacture of PAN fibres with the water-thiocyanate (salt) method was investigated previously in [3][4][5]. Diffusion of water into the spinning solution jet takes place at a higher rate than diffusion of NaSCN into the spinning bath. This initially causes slight swelling of the spun gel fibre and then insignificant compaction of its structure (before leaving the spinning bath).The two-phase character of the structure of PAN fibres not treated with heat was hypothesized in [6][7][8]. Heating PAN fibres above the glass transition temperature (T g ) intensifies relaxation processes that lead to transition of amorphous regions in the polymer substrate to a more ordered mesophase.We report the results of a systematic study of the structure of PAN gel fibres based on terpolymers of acrylonitrile (AN), methyl acrylate (MA), and itaconic acid (ItA) or 2-acrylamide-2-methylpropanesulfonic acid (AM...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Experimental study of the structure of polyacrylonitrile gel fibres

2004

View full text Add to dashboard Cite

show abstract

Development of novel catalytically active polymer-metal-nanocomposites based on activated foams and textile fibers

et al. 2013

View full text Add to dashboard Cite

In this paper, we report the intermatrix synthesis of Ag nanoparticles in different polymeric matrices such as polyurethane foams and polyacrylonitrile or polyamide fibers. To apply this technique, the polymer must bear functional groups able to bind and retain the nanoparticle ion precursors while ions should diffuse through the matrix. Taking into account the nature of some of the chosen matrices, it was essential to try to activate the support material to obtain an acceptable value of ion exchange capacity. To evaluate the catalytic activity of the developed nanocomposites, a model catalytic reaction was carried out in batch experiments: the reduction of p-nitrophenol by sodium borohydride.

show abstract

High-Performance and Functional Fiber Materials—A Review of Properties, Scanning Electron Microscopy SEM and Electron Dispersive Spectroscopy EDS

Mahltig

Grethe

2022

Textiles

View full text Add to dashboard Cite

This review supports an overview of selected high-performance fibers and functional fiber materials. A review of several properties and applications is given. For fiber materials and fabrics, microscopic images taken by scanning electron microscopy (SEM) are presented. As well as this, electron dispersive spectroscopy (EDS) is performed on the fiber materials and an overview of EDS spectra is presented. The features of SEM images and EDS spectra are discussed, especially with the aim of supporting people who are working in the field of fiber analytics. To support a complete view of both analytic methods—SEM and EDS—challenges and typical mistakes for SEM measurements on textiles are also described. Altogether, this review supports a useful overview of interesting high technology fiber materials and their investigation using the analytical methods SEM and EDS. Using these, material properties and their composition are presented and discussed. The composition of industrial fiber materials is investigated and discussed, as well as fiber treatments for the realization of functional fiber properties. Furthermore, it aims to support a helpful tool for fiber and textile analytics and identification.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Untitled

Cited by 3 publications

References 1 publication

Experimental study of the structure of polyacrylonitrile gel fibres

Experimental study of the structure of polyacrylonitrile gel fibres

Development of novel catalytically active polymer-metal-nanocomposites based on activated foams and textile fibers

High-Performance and Functional Fiber Materials—A Review of Properties, Scanning Electron Microscopy SEM and Electron Dispersive Spectroscopy EDS

Contact Info

Product

Resources

About