Strategies and progress in synthetic textile fiber biodegradability

The serious issue of textile waste accumulation has raised attention on biodegradability as a possible route to support sustainable consumption of textile fibers. However, synthetic textile fibers that dominate the market, especially poly(ethylene terephthalate) (PET), resist biological degradation, creating environmental and waste management challenges. Because pure natural fibers, like cotton, both perform well for consumer textiles and generally meet certain standardized biodegradability criteria, inspiration from the mechanisms involved in natural biodegradability are leading to new discoveries and developments in biologically accelerated textile waste remediation for both natural and synthetic fibers. The objective of this review is to present a multidisciplinary perspective on the essential bio-chemo-physical requirements for textile materials to undergo biodegradation, taking into consideration the impact of environmental or waste management process conditions on biodegradability outcomes. Strategies and recent progress in enhancing synthetic textile fiber biodegradability are reviewed, with emphasis on performance and biodegradability behavior of poly(lactic acid) (PLA) as an alternative biobased, biodegradable apparel textile fiber, and on biological strategies for addressing PET waste, including industrial enzymatic hydrolysis to generate recyclable monomers. Notably, while pure PET fibers do not biodegrade within the timeline of any standardized conditions, recent developments with process intensification and engineered enzymes show that higher enzymatic recycling efficiency for PET polymer has been achieved compared to cellulosic materials. Furthermore, combined with alternative waste management practices, such as composting, anaerobic digestion and biocatalyzed industrial reprocessing, the development of synthetic/natural fiber blends and other strategies are creating opportunities for new biodegradable and recyclable textile fibers. Article Highlights Poly(lactic acid) (PLA) leads other synthetic textile fibers in meeting both performance and biodegradation criteria. Recent research with poly(ethylene terephthalate) (PET) polymer shows potential for efficient enzyme catalyzed industrial recycling. Synthetic/natural fiber blends and other strategies could open opportunities for new biodegradable and recyclable textile fibers.

​Okra Plant: A Multi-purpose Underutilized Vegetable Crop: A Review

The plant kingdom has various species that are underutilised. Proper scientific approached help them to utilised for multiple end applications. Okra is one of such underutilized multi-purpose vegetable crop. Green immature okra fruits are consumed as a vegetable worldwide. Okra seed is a good source of oil and protein. Okra seeds are also used as a substitute for coffee. Okra roots are used for clarification of sugarcane juice. It has medicinal value as well as useful in wastewater treatment. Okra is also a potential source of natural fibers suitable for textile, paper and other engineering applications. The present paper reviewed the okra plant, its cultivation and applications in various form such as food, medicine, textile fiber, paper pulp, biomass, etc. for its introduction as a multi-purpose vegetable crop.

Experimental Investigation on Bending Behavior of Textile Reinforced Concrete (TRC) Plates at High Temperatures

Textile Reinforced Concrete (TRC) can be used as independent structural elements due to its high loading capacity and proper to product light weight and thin walled structural elements. In this study, the bending behavior of TRC plates that reinforced with dry carbon fiber textile and exposed to high temperatures was experimentally studied under 4-points bending loading. The examined parameters were; (a) number of textile fiber reinforcements layers 1, 2 and 3 layers; (b) level of high temperatures 20°C, 200°C, 300°C, and 400°C. Firstly, the mechanical properties of the cementitious matrix and the tensile properties of TRC coupons at each predefined temperature were evaluated. The results showed that the ultimate tensile stress of the TRC coupons did not affect up to 200°C, however, a significant reduction observed at 300°C and 400°C by 19% and 24% respectively. Regarding the compressive strength and flexural strength of the cementitious matrix, the degradation was not severe until 200°C, while it became critical at 400 °C (23% and 22% respectively). The result of the bending of TRC plates showed that doubling and tripling textile fiber reinforcements layers improved the flexural loading. In general, increasing the level of temperatures resulted in decrease in the flexural capacity of TRC plates. The highest decrease recorded for the specimen reinforced with 1-layer of carbon fiber textile subjected to 400 °C and was 33%.

Застосування ультразвукового пристрою для визначення поверхневої густини текстильної волоконної маси

Purpose. Ensuring the determination of the basis weight of the textile fiber mass directly during the manufacturing process using an ultrasonic device equipped with non-contact ultrasonic sensors. In particular, show the effect of the basis weight of a textile fiber mass on the amplitude of probing vibrations in the measuring channel of an ultrasonic device. An amplitude control method is proposed, which is the basis of the operation of the ultrasonic device. It consists in irradiating the textile fiber mass, which moves relative to the scanning bracket with the sensors, and determining the basis weight of the fiber mass by reducing the amplitude of the ultrasonic waves in the measuring channel. The measurement results are processed with their subsequent digitization and computer analysis. It has been established that due to the passage and re-reflection of ultrasonic waves, which fall on two receivers with different vibration delays, it is possible to increase the accuracy of measurements of the average values of the basis weight of the textile fiber mass. Originality. In the general case, it is established that by passing and reflecting ultrasonic waves entering two receivers with different delay of oscillations, it is possible to increase the accuracy of measurements of average values of basis weight of textile fiber mass. The block diagram of the ultrasonic device for determination of basis weight of textile fiber mass is shown and its work is described. The main dependences on which the device system will determine the basis weight of the textile fiber mass are also given.

Comparison of various methods of flines of flax raw materials used in Kazakhstan

Significant attention in the article is devoted to the study of different technology of the lobe and the physical and mechanical properties of oil flax fiber and primary processing in relation to Kazakhstan. When studying the technology of oil flax fiber soaking, the task was set of separate the fiber from the stems, removal of lignin and pectin-forming substances. The questions of various technologies of the flax stalks are considered. The most optimal technology for producing textile fiber was determined for the conditions of Kazakhstan. Comparative studies of linear density and length of fibers have been carried out. According to the results obtained, the linear density of the fiber in an aqueous medium is 6.7 T, the result of the treated fiber is 3.1 T. That is, the technology used is to remove lignin and pectin from the fiber.