Comparative evaluation of the thermal properties of aromatic fibres (polyoxazole, polyimide, and polyaramid)

Perepelkin, K. E.; Malan'ina, O. B.; Pakshver, E. A.; Makarova, R. A.

doi:10.1007/s10692-005-0010-z

Cited by 5 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a detailed evaluation of the thermal characteristics of POD fibres, they were investigated by methods of thermomechanical analysis (TMA), dynamic thermogravimetry (TGA), differential scanning calorimetry (DSC), and differential thermal analysis (DTA) in air and in nitrogen medium [14][15][16], and preservation of their mechanical properties was investigated in a wide temperature range. The results of our studies corresponding to the data in [1,4,6,7] and are examined in detail below.…”

Section: Thermal Properties Of Polyoxazole Fibres and Filamentsmentioning

confidence: 97%

Highly heat-resistant polyoxadiazole fibres and arselon filament: principles of manufacture, properties, and use. An analytical review

2008

Fibre Chem

View full text Add to dashboard Cite

Highly heat-resistant fibres and materials made from them are widely used in different industrial sectors -for filtration of gaseous media, heat insulation, vehicle upholstery, occupational and environmental protection. Due to the high heat and thermooxidative resistance, the temperature of use of these materials is 250-300°C, attaining 300-350°C and higher for individual types, and the initial decomposition temperature is within the limits of 450-500°C.Polyoxadiazole (POD) fibres are of great interest among highly heat-resistant fibres. Professor G. I. Kudryavtsev and his colleagues (A. V. Volokhina, V. N. Odnoradova, A. V. Semenova, and others) took the initiative for manufacturing them in Russia and developing the industrial principles. Polyoxadiazole fibres and filaments of the first generation were made from the copolymer of terephthalic and isophthalic acids (in the ratio of 7:3) and hydrazine sulfate [1-5]. These fibres and filaments have the brand name Oxalone®. The initial raw materials are phthalic acids and hydrazine sulfate -readily available and manufactured in many countries in the world.At present, Heat-Resistant Articles Production Co. is the leading firm in POD fibre and filament technology; together with Svetlogorsk Khimvolokno Production Association, it developed new continuous technology for manufacturing them from terephthalic acid homopolymer and hydrazine in equimolar ratios and organized their industrial production. The trade name "Arselon" was registered for the second generation of POD fibres and filaments [6][7][8]. Heat-resistant photostabilized fibres and filaments were also developed.

show abstract

Section: Thermal Properties Of Polyoxazole Fibres and Filamentsmentioning

confidence: 97%

Highly heat-resistant polyoxadiazole fibres and arselon filament: principles of manufacture, properties, and use. An analytical review

2008

Fibre Chem

View full text Add to dashboard Cite

show abstract

“…Much work [13,14,15,16] has been performed to investigate the thermal stability of these fibers for use in high-temperature environments and fire applications. These materials are chemically similar to other fibers used in fire-resistant applications, such as para and meta-aramid fibers, so interest in their thermal properties is not surprising.…”

Section: Moisture Sorption and Other Propertiesmentioning

confidence: 99%

“…These materials are chemically similar to other fibers used in fire-resistant applications, such as para and meta-aramid fibers, so interest in their thermal properties is not surprising. The decomposition tempera-Study of Acid Generation from Copolymer Fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole tures in air for Armos showed that it was stable to oxidation and onset of degradation to approximately 400 • C [15]. A separate study on the thermal stability of PPTA, SVM, Rusar, and Armos fibers in which the fibers were exposed to 250 • C for periods of time between 0 h and 100 h showed that the mechanical properties of the SVM fibers decreased the most rapidly, and that there was little difference in the thermal stability of the other fibers examined [13].…”

Section: Moisture Sorption and Other Propertiesmentioning

confidence: 99%

Study of acid generation from copolymer fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole

Forster¹,

Messin²,

Rice³

et al. 2009

View full text Add to dashboard Cite

In a communication to the ballistic vest community released in January 2006, there was an allegation by a competing fiber manufacturer that copolymer fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole can release hydrochloric acid, which could potentially be detrimental to other fibers that might come in contact with these materials. Despite the fact that these allegations came from a competing manufacturer, this issue was investigated to determine if it was an officer safety issue. This study investigates the evolution of acid in aqueous environments from these fibers, reviews the available literature on the fibers, and provides an analysis of the chemical structure of these fibers to serve as the basis for future studies. It was determined that there is some evidence to support the allegations; two of the fiber samples studied released a sufficient amount of acid to drop the pH of an aqueous solution from approximately pH 6.0 to approximately pH 3.0 in less than ten days. Further ion-selective electrode (ISE) studies of chloride ion released from these fibers indicated that hydrochloric acid may not be the species responsible for this pH reduction. Future studies are planned to better elucidate the species responsible for this pH reduction and examine the effect of moisture on the pH reduction of the fibers, as well as the effect of water vapor on the chemical and physical properties of these fibers. v Study of Acid Generation from Copolymer Fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole This page intentionally left blank. vi Study of Acid Generation from Copolymer Fibers based on 5-amino-2-(p-aminophenyl

show abstract

“…Due to the above, comparative studies of the thermooxidative degradation and size stability (lengthening or shrinkage) of the fibres and thread listed above were conducted to evaluate their behavior in conditions close to the conditions of use and to refine some previously obtained data [16,17].…”

Section: And E a Pakshvermentioning

confidence: 99%

Thermal characteristics of high-strength and thermostable aromatic fibres

2008

Self Cite

View full text Add to dashboard Cite

and E. A. PakshverThe thermal characteristics of para-aramid, polyoxadiazole, and polyimide fibres were comparatively investigated by dynamic thermogravimetric analysis, differential scanning calorimetry, and thermomechanical analysis. It was shown that thermooxidative degradation of these types of fibres began at 400-450°C and intensified at higher temperatures. The fibres investigated are characterized by size stability up to the initial temperature of thermooxidative processes (400-450°C). With respect to thermal stability, these fibres are in the following order: polyimide > polyoxadiazole, and carbocyclic para-aramid fibres. The correlation of the "hydrogen index" I H and "aromaticity index" I Ar for thermostable fibres with their thermal stability was demonstrated.Among the fibres and fibre materials with extreme characteristics, aromatic ultrastrong and thermostable fibres and thread occupy the leading position and world production is estimated at more than 70,000 tons a year and continues to increase. The materials made from them are designed for prolonged use in the most critical articles at high loads and/or temperatures: in structures in modern transportation (especially aircraft), items for occupational protection, rescue equipment in transportation or in dangerous plants, etc. As a function of the application, these materials and the items made from them must satisfy additional special requirements: preservation of size and shape at high temperatures, resistance to open flames, preservation of elevated electrical insulation indexes, etc. Many types of fibres and thread satisfy these indexes, and the following are made from them:-thermostable polyimide fibres and thread (PI-PM) which have high flame resistance and are highly thermostable dielectrics;-thermostable polyoxadiazole (POD) fibres and thread used in protective clothing and for high-temperature filtration of gases; -thermostable, high-strength and high-modulus para-aramid fibres and thread made of poly(p-phenylene terephthalamide) (PPTA), which have the low deformability necessary for highly loaded textile articles and composites.A comparison and comparative analysis of the functional characteristics in prolonged exposure to high temperatures are the most important questions in optimizing the use of these fibres and fibre materials. However, such data are only reported in the literature for the strength indexes, estimated at 20 and 250 or 300°C [1][2][3][4][5][6][7]. In some studies, both the strength and the change in the strength in thermal aging and the thermal characteristics of the individual types of aromatic fibres have been compared [8][9][10][11][12][13][14]. The attempts to compare the few data from different researchers were very approximate due to the methodological differences and indeterminacy in selection of the samples.We found no published comparative studies of thermooxidative degradation of different kinds of aromatic fibres/thread, although these data are extremely important in optimizing their selection for different type...

show abstract

Comparative evaluation of the thermal properties of aromatic fibres (polyoxazole, polyimide, and polyaramid)

Cited by 5 publications

References 1 publication

Highly heat-resistant polyoxadiazole fibres and arselon filament: principles of manufacture, properties, and use. An analytical review

Highly heat-resistant polyoxadiazole fibres and arselon filament: principles of manufacture, properties, and use. An analytical review

Study of acid generation from copolymer fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole

Thermal characteristics of high-strength and thermostable aromatic fibres

Contact Info

Product

Resources

About