The purpose of this research is to examine fastness and dimensional stability of the knitted fabrics made of three types of new generation regenerated cellulose fibres such as Naia™ Renew, Tencel™ Lyocell and Ecocell™. The perspiration, washing, water and rubbing fastness tests and also dimensional stability determination were performed. The data was compared with the ones of the cotton fabric. The goal of this study is comparing whether recently developed new generation regenerated cellulose fibers compared to cotton, presents better performance considering customer perceptions. Accordingly, the acidic and basic perspiration (TS EN ISO 105–E04), washing (TS EN ISO 105–C06), water (TS EN ISO 105–E01) and rubbing fastness (TS EN ISO 105–X12) tests and also dimensional stability (TS EN ISO 3759) determination was performed in this concept.

This current research reports the characterization of fibers from Posidonia oceanica L. (P. oceanica) for the interest in usability as additive biomaterial in polymer-based materials. The results revealed that cellulose content, density, and average fiber diameter of the fibers from P. oceanica were 45.35%, 1.15 g/cm3 and 238.41 μm, respectively. The maximum degradation temperature, char yield and activations energy were found to be 318.8 ºC, 31.82% 600 ºC and 49.36 kJ/mol, respectively. Considering the output of this current research, the fibers from P. oceanica can be employed as reinforcement or additive for polymeric based materials for potential applications.

In this study, the effect of ionic liquids on the dyeing of cotton fabrics with reactive dyestuffs was investigated. For this purpose, 100% cotton fabrics were treated with imidazolium (1-ethyl-2,3-dimethylimidazolium ethyl sulfate- E) and ammonium (methyl-tri-n-butylammonium methyl sulfate- B) based ionic liquids with three different concentrations. To assess the effect of the treatments, the cotton fabrics were characterized by FT-IR, SEM and DSC. After this treatment, the cotton fibers were dyed with 1.0% o.w.f reactive dye. The K/S values were determined to evaluate the effect of ionic liquids on the dyeability of cotton fabrics and fastness analyses to washing, water and rubbing were conducted to examine the end-use properties of dyed fabrics. The results revealed that ionic liquids settled on the fabric surface and after each ionic liquid modification, the increasing intensity was observed with increasing ionic liquid concentrations at broad bands according to the FT-IR analysis. It was determined that the K/S value of the modified cotton fabric increased with increment in the concentration of ionic liquid E, especially. Considering the overall results, it is possible to state that ionic liquids which are implemented in this study are efficient in enhancing the dyeability of the cotton fabrics.

In recent years, there has been an outbreak of research on natural fiber-reinforced materials to reduce non-recycled material effects and produce environmentally friendly products. In parallel with the increasing popularity of additive manufacturing, the development of new natural fiber-reinforced materials in this field has also increased to improve pure material characteristics and reduce raw materials usage. This study presents the manufacturing process of %5 waste jute-reinforced PLA filaments and the characteristics of 3D printed parts. For the production of jute-reinforced filaments, polylactic acid (PLA) granules were pulverized to increase the material surface for better bonding between materials in the composite matrix structure. The effectiveness of pulverizing PLA granules was exposed by comparing it with the production of the same composite matrix with PLA granules. Both matrices were formed into filaments to produce 3D parts in Fused Filament Fabrication technology. Thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC) will be presented in filament form. Besides, the mechanical properties of 3D parts will also be presented. Within the scope of the study, it is aimed to reveal the material size effect for producing natural fiber-reinforced filaments for additive manufacturing.

The objective of the present research was to investigate the efficiency of alkali treatment on obtaining fine banana fibers. The fibers were exposed to alkali aqueous solutions at different concentrations changing from 5 to 20 wt%. The acting mechanism of the alkali treatment is removing of non-cellulosic constituents and separating the fiber bundle into smaller elementary single fibers. The efficiency of the alkali treatments was analyzed with the help of optical observations, fiber diameter measurement, single fiber tensile test and determination of pectin component. Chemical, crystalline, thermal and morphological properties of the fibers were examined by FTIR, XRD, TGA and SEM, respectively. FTIR analyses proved the removal of non-cellulosic components such as hemicellulose and lignin after alkali treatment. Fiber diameter decreased with increasing concentration of alkali treatment. Tensile properties and crystallinity index are correlated with alkali concentration. However, cellulose structure of the banana fiber was altered at mild alkali treatments. Microscopic observations revealed the appearance of single elementary fibers from the fiber bundle of the banana. These experimental findings suggested that alkali treatment can play promising role to prepare lignocellulosic fibers for textile applications.