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1.
Colour of polyester thread, in regard to different dyeing procedures and dye-bathsć ph
Darinka Fakin, Alenka Ojstršek, Alenka Majcen Le Marechal, 2008, published scientific conference contribution

Abstract: The aim of the presented research was to investigate the impact of different dyeing procedures (conventional two-baths and one-bath) and dye-bathsć pH (acidic and alkaline) on the exhaustion of five disperse dyestuffs, differing in colour (yellow, red, blue, violet and black). The dyeing of polyester thread was carried-out at two concentrations (1 and 3%). The concentration of dye residual in dye-bath effluents were determined by absorbance measurement, followed by colourimetrical evaluation of dyed samples, and colour differencescalculation. The obtained results indicating superior dye exhaustion throughout alkaline one-bath procedure in comparison to conventional polyester dyeing that affect also on reduction of dyeing time, amount of dye-bath wastewaters, and energy consumption.
Keywords: polyester sewing, dyeing, disperse dyestruffs, colourimetry
Published: 31.05.2012; Views: 857; Downloads: 20
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2.
Polyester type polyHIPE scaffolds with an interconnected porous structure for cartilage regeneration
Jakob Naranđa, Maja Sušec, Uroš Maver, Lidija Gradišnik, Mario Gorenjak, Andreja Vukasović, Alan Ivković, Marjan Rupnik, Matjaž Vogrin, Peter Krajnc, 2016, original scientific article

Abstract: Development of artificial materials for the facilitation of cartilage regeneration remains an important challenge in orthopedic practice. Our study investigates the potential for neocartilage formation within a synthetic polyester scaffold based on the polymerization of high internal phase emulsions. The fabrication of polyHIPE polymer (PHP) was specifically tailored to produce a highly porous (85%) structure with the primary pore size in the range of 50–170 μm for cartilage tissue engineering. The resulting PHP scaffold was proven biocompatible with human articular chondrocytes and viable cells were observed within the materials as evaluated using the Live/Dead assay and histological analysis. Chondrocytes with round nuclei were organized into multicellular layers on the PHP surface and were observed to grow approximately 300 μm into the scaffold interior. The accumulation of collagen type 2 was detected using immunohistochemistry and chondrogenic specific genes were expressed with favorable collagen type 2 to 1 ratio. In addition, PHP samples are biodegradable and their baseline mechanical properties are similar to those of native cartilage, which enhance chondrocyte cell growth and proliferation.
Keywords: polyester, polymerization, polyHIPE
Published: 23.06.2017; Views: 590; Downloads: 208
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