Simulations of Heat Transport Phenomena in a Three-Dimensional Model of Knitted Fabric

The main goal of the current work is to analyse the three-dimensional approach for modelling knitted fabric structures for future analysis of physical properties and thermal phenomena. The introduced model assumes some simplification of morphology. First, fibres in knitted fabrics are described as monofilaments characterized by isotropic thermal properties. The current form of the considered knitted fabric is determined by morphological properties of the used monofilament and simplification of the stitch shape. This simplification was based on a particular technology for the knitting process that introduces both geometric parameters and physical material properties. Detailed descriptions of heat transfer phenomena can also be considered. A sensitivity analysis of the temperature field with respect to selected structural parameters was also performed

International Technical Textiles Congress 14-16

ABSTRACT Dibutyrylchitin (DBC) is an ester derivative of a natural polysaccharide -chitin. DBC is obtained by reaction of chitin with butyric anhydride in the presence of a catalyst. The production me thods of DBC were elaborated and optimized. DBC is easily soluble in common organic solvents and has film-and fibre forming properties. Such characteristic allows obtaining classical fibres from the polymer solutions. DBC is also a raw material for manufacturing yarn and for a broad range of textile dressing materials. Fibres with good mechanical properties were obtained by an optimized spinning process from the DBC solutions. The excellent biomedical properties of the DBC were confirmed by different experimental results which proved that DBC is a biocompatible and biodegradable polymer and stimulates regeneration of damaged tissues. Tests of these DBC dressing materials under clinical conditions were done and proved the excellent results of DBC-based dressing materials for the ordered healing of tissues and wounds. The DBC dressing materials accelerate the healing of the wound and are biodegraded during the healing process. From the clinical tests, it was clearly observed that the DBC dressing materials were absorbed into the fresh tissue formed during the healing process of the wounds. DBC and DBC-based dressing materials are good bioactive textile materials for wound healing and for understanding the biological properties of chitin derivatives. The obtained results proved the importance of the O-substitution of the hydroxyl groups present in chitin, not only for the solubility of the derivatives and the mechanical properties of the produced fibres, but still more important for the biological properties of these ester derivatives of chitin containing butyric acid. This development creates a link between textile products, based on material properties, and human health, based on the biological properties of the basic material. The mechanical properties of DBC were further optimized by blending it with poly(ε -caprolactone). Good transparent and flexible products, such as films, with a high elongation to break were obtained by blending 10 to 20wt% of poly(ε-caprolactone) with DBC. This creates new possible bioactive applications for DBC or poly(ε-caprolactone)

International Technical Textiles Congress 14-16

ABSTRACT Dibutyrylchitin (DBC) is an ester derivative of a natural polysaccharide -chitin. DBC is obtained by reaction of chitin with butyric anhydride in the presence of a catalyst. The production me thods of DBC were elaborated and optimized. DBC is easily soluble in common organic solvents and has film-and fibre forming properties. Such characteristic allows obtaining classical fibres from the polymer solutions. DBC is also a raw material for manufacturing yarn and for a broad range of textile dressing materials. Fibres with good mechanical properties were obtained by an optimized spinning process from the DBC solutions. The excellent biomedical properties of the DBC were confirmed by different experimental results which proved that DBC is a biocompatible and biodegradable polymer and stimulates regeneration of damaged tissues. Tests of these DBC dressing materials under clinical conditions were done and proved the excellent results of DBC-based dressing materials for the ordered healing of tissues and wounds. The DBC dressing materials accelerate the healing of the wound and are biodegraded during the healing process. From the clinical tests, it was clearly observed that the DBC dressing materials were absorbed into the fresh tissue formed during the healing process of the wounds. DBC and DBC-based dressing materials are good bioactive textile materials for wound healing and for understanding the biological properties of chitin derivatives. The obtained results proved the importance of the O-substitution of the hydroxyl groups present in chitin, not only for the solubility of the derivatives and the mechanical properties of the produced fibres, but still more important for the biological properties of these ester derivatives of chitin containing butyric acid. This development creates a link between textile products, based on material properties, and human health, based on the biological properties of the basic material. The mechanical properties of DBC were further optimized by blending it with poly(ε -caprolactone). Good transparent and flexible products, such as films, with a high elongation to break were obtained by blending 10 to 20wt% of poly(ε-caprolactone) with DBC. This creates new possible bioactive applications for DBC or poly(ε-caprolactone)

Piezoelectric textiles : state of the art

The textile industry has made significant advances in the fields of intelligent and multifunctional textiles, mainly in the sector of high performance products. Electrotextiles and intelligent textiles present enormous potential in creating a new generation of flexible, comfortable and multifunctional structures for many applications. Therefore, the textile sector is greatly interested in the development of new fibrous forms of sensors, exploring the potential resulting from materials science. Piezoelectric polymer films, monofilaments, multifilaments and fibres are highly suitable and attractive for the development of a new generation of intelligent textiles. The main objective of this paper is to give a comprehensive overview of piezoelectric textiles