High-modulus polyvinyl alcohol fibres

Perepelkin, K. E.; Leninkov, O. S.; Utevskii, L. E.; Mazo, A. I.; Pugach, B. M.; Ulitin, O. N.

doi:10.1007/bf00633266

Cited by 2 publications

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“…The high-modulus fibre must not be damaged during removal of the layer of finish; -processing the high-modulus fibre with an auxiliary accessory fibre subsequently easily removed from the finished material or article is used to facilitate passage of high-modulus fibres over the thread-guide parts. Water-soluble polyvinyl alcohol fibres, sodium alginate fibres (soluble in aqueous base), and hydrated cellulose (viscose) fibres (easily hydrolyzed in acid media) are used as the accessory [10,25]. The conditions of removing the accessory fibre should not affect the properties of the basic high-modulus fibre; -use of an accessory fibre which can remain in the binder matrix in a reinforced composite is a special case.…”

Section: Practical Aspects Of Processingmentioning

confidence: 99%

“…The layer of finish plays a dual role: it increases the bending radius of the fibre and "heals" defects in the fibres -filament breaks, thickening, etc. Easily soluble or hydrolyzable polymers, polyvinyl alcohol (containing 10-15% acetate groups) and carboxymethylcellulose, for example, are used as finishing agents [10,25]. The high-modulus fibre must not be damaged during removal of the layer of finish; -processing the high-modulus fibre with an auxiliary accessory fibre subsequently easily removed from the finished material or article is used to facilitate passage of high-modulus fibres over the thread-guide parts.…”

Section: Practical Aspects Of Processingmentioning

confidence: 99%

“…As these data show, the different deformability, which is a function of the relaxation (physical) state, is an important feature of these fibres [5][6][7][8][9][10][11][12][13][14][15], which causes large differences in the approaches in constructing articles and selecting processing conditions.…”

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confidence: 99%

“…); -carbon polymers; -silicates (glass, basalt, quartz); -inorganic (ceramic) -boron, oxide, carbide, etc.). The fundamental physicomechanical properties of these fibres summarized in Table 2 [5][6][7][8][9][10][11][12][13][14][15] are the result of tensile tests in standard conditions -at 20°C for ~10 sec. However, the conditions of processing the fibres differ significantly from the conditions of standard tensile tests.…”

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confidence: 99%

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Effect of structure and relaxation state on the properties and processing of chemical fibres for industrial applications

Perepelkin

2009

Fibre Chem

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The features and differences in the structure, physical (relaxation) state, and properties of the basic types of industrial fibres that are important in processing them into textile and composite materials and articles are briefly examined. Fundamental recommendations are given on optimizing processing and increasing the degree of realization of the mechanical properties of the high-modulus industrial fibres in articles.Approximately 25% of the total textiles manufactured now are industrial textiles. The precise amount is difficult to estimate, since the concept of "industrial textiles" includes different types of materials and articles used in many areas of engineering, agriculture, transportation, sports, tourism, medicine, etc., in different countries. Highly loaded textile articles, fibre construction composites, and rubber textile articles are the most important types [1,2]. Fibres made of aliphatic, aromatic, carbon, silicate, and inorganic (ceramic) polymers are used to manufacture industrial articles. However, the features of the structure and properties of some types of fibres cause important problems in processing, which requires special approaches in constructing the articles to ensure stability of processing (continuity) and attaining the highest level of the mechanical properties. It should be noted that ordinary types of complex textile fibres for widely used articles do not cause such problems, since they have relatively high deformability.In publications on fibre processing, the fibres are usually considered as polymer rods of low cross section, i.e., as a united whole, usually with no analysis of the structural dependence of their mechanical properties [3,4]. This approach is valid, but does not allow completely evaluating the role of the macrostructure of the fibres and properties of the individual filaments in processing the fibres. This is very important for optimizing the technology and properties of the fibres, materials, and articles obtained.In previous studies, the important role of both the morphological and energetic characteristics of the structure and the physical (relaxation) state in formation of the properties of fibres/filaments in examining the structural features of chemical fibres and filaments [5][6][7]. We will expand the examination of the role of the structure in the "behavior" of fibres in processing and formation of some of the macroproperties of fibre materials/articles. Let us consider the features of the structure and properties of chemical fibres important for optimizing processing and attaining maximum realization of their mechanical properties in articles. BASIC TYPES OF CHEMICAL FIBRES FOR INDUSTRIAL USEThe wide range of industrial articles makes it necessary to use the most varied types of fibres for manufacturing them -from hyperelastic to highly brittle (Table 1). At ordinary temperature, they are in different relaxation (physical) states. For this reason, the corresponding process conditions are required for each type of fibre. Processing of hyperelastic St. Pe...

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Section: Practical Aspects Of Processingmentioning

confidence: 99%

Section: Practical Aspects Of Processingmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Effect of structure and relaxation state on the properties and processing of chemical fibres for industrial applications

Perepelkin

2009

Fibre Chem

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“…Polyvinyl alcohol (P VA) fibres, which have many positive properties, developed relatively significantly in the sixties to the eighties [25,26]. Their production subsequently decreased primarily due to the high power consumption and complexity of obtaining the true polymer --polyvinyl alcohol.…”

Section: Evolution Of Individual Kinds Of Fibresmentioning

confidence: 99%

Chemical fibres: Present and future

Perepelkin¹

2000

Fibre Chem

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677.4.003 In the more than hundred-year history of chemical fibres, their role in the production of consumer materials and articles and the evolution of science and technology is indisputable. Manufacture of chemical fibres is increasing from year to year, and for this reason it is very interesting to predict the future prospects for the evolution of this industry, the appearance of new types, and the possible replacement of some types of fibres by others.The world's population is currently approximately 6 billion people, and the per capita consumption of fibres is estimated at approximately 7-8 kg a year. This figure is unevenly distributed between regions as a function of the climate, level of development of the countries, and other reasons. It is much higher in developed countries and countries with colder climates. According to the predictions of sociologists, Earth's population in the first half of the next century will approach 10-12 billion, and the increase in the demand for fibres and fibre materials per capita, including the needs of evolving technology, could be 12-15 kg and higher, which corresponds to the demand for fibres in developed countries.Production of natural fibres--cotton,jute, flax, hemp, and natural silk--attained 26-27 million tons, and approximately the same amount of chemical fibres is manufactured, not counting silicate and other inorganic fibres. Production of natural fibres could increase slightly as a result of use of enhanced agricultural technology, creation of more productive plant varieties, and optimization of the use of fertilizers and agents for controlling pests and diseases, but it is not possible to count on a significant increase in their manufacture since cultivated areas in the future will primarily be required for growing agricultural food products. Production of natural fibres will thus gradually approach a limit which is estimated at 30-35 million tons. The consequence of this is that all demand in the future should be satisfied by chemical fibres by constantly increasing their production.In analyzing the evolution of chemical fibre production, it is necessary to consider a number of factors that affect this process, including improvement of technology; reduction of power and materials consumption; decreased hazardousness of production and elimination of harmful emissions; creation of technologies based on new principles; expansion of the assortment and production of new kinds of fibres; possibility of replacing certain fibres by others.The demands for the quality of chemical fibres are also changing significantly --"wearer-friendly" fibres and fibre materials have become increasingly necessary (they have now been combined under the term "Shin-gosen," introduced for the first time in 1982 in Japan); ultrastrong, thermostable, and other wear-resistant fibres are required in technology.All kinds of chemical fibres and thread can be broken down into three fundamental groups by production volumes and use: large-tonnage domestic and general use; large-and medium-tonn...

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High-modulus polyvinyl alcohol fibres

Cited by 2 publications

References 0 publications

Effect of structure and relaxation state on the properties and processing of chemical fibres for industrial applications

Effect of structure and relaxation state on the properties and processing of chemical fibres for industrial applications

Chemical fibres: Present and future

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