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Silvering of Inert PET-Textile Materials by Means of One-Bath and Two-Bath Methods and their Characteristics

Onggar T, Hund H, Hund R D, Cherif C

Fibres & Textiles in Eastern Europe

2014

Vol. 22, no. 1 (103)

108--114

The metallised textile material available on the market is not suitable for several applications because of its uneven metal layer with imperfections on the fibre surface, which leads to a lack of adhesion and failures of the metal layer, impairing further processing as well as the functioning of the metallised textiles. Furthermore the wet-chemical metallisation of textile substrates has so far been limited to only a few polymers (polyamide). In the framework of this work, the scientific basis for the antimicrobial and electrical functionalisation as well as modification of inert textile material made of polyethylene terephthalate (PET) was acquired. Since textiles produced from PET have an inert and hydrophobic surface, which means they do not have functional groups, a wet-chemical one-bath and two-bath metallisation method was developed to permanently attach silver and silver compounds to the chemically inert fibre surface.

Metalizowane materiały włókiennicze ogólnie dostępne często nie nadają się dla szeregu zastosowań ze względu na nierównomierną warstwę metaliczną, zakłócenia powierzchni włókien i brak adhezji. Równocześnie należy stwierdzić, że mokry proces chemicznego metalizowania tekstyliów jest ograniczony tylko do niektórych polimerów, głównie poliamidów. Opracowano naukowe podstawy funkcjonalizacji powierzchni materiałów w kierunku uzyskania właściwości elektrycznych oraz antymikrobowych, zwracając szczególną uwagę na pokrywanie materiałów włókienniczych z PET. Opracowano metodę pokrywania materiałów w procesie jednej lub dwóch kąpieli, biorąc pod uwagę hydrofobowość materiałów PET, jak również brak grup funkcyjnych na ich powierzchni. Uzyskano możliwość trwałego pokrywania powierzchni włókien srebrem oraz stopami srebra.

Pure chitosan microfibres for biomedical applications

Toskas G., Brünler R., Hund H, Hund R D, Hild M., Aibibu D., Cherif C.

Autex Research Journal

2013

Vol. 13, no. 4

134--140

Due to its excellent biocompatibility, Chitosan is a very promising material for degradable products in biomedical applications. The development of pure chitosan microfibre yarn with defined size and directional alignment has always remained a critical research objective. Only fibres of consistent quality can be manufactured into textile structures, such as nonwovens and knitted or woven fabrics. In an adapted, industrial scale wet spinning process, chitosan fibres can now be manufactured at the Institute of Textile Machinery and High Performance Material Technology at TU Dresden (ITM). The dissolving system, coagulation bath, washing bath and heating/drying were optimised in order to obtain pure chitosan fibres that possess an adequate tenacity. A high polymer concentration of 8.0–8.5% wt. is realised by regulating the dope-container temperature. The mechanical tests show that the fibres present very high average tensile force up to 34.3 N, tenacity up to 24.9 cN/tex and Young’s modulus up to 20.6 GPa, values much stronger than that of the most reported chitosan fibres. The fibres were processed into 3D nonwoven structures and stable knitted and woven textile fabrics. The mechanical properties of the fibres and fabrics enable its usage as textile scaffolds in regenerative medicine. Due to the osteoconductive properties of chitosan, promising fields of application include cartilage and bone tissue engineering.