Textiles, with appropriate light absorbers and suitable finishing methods, can be used as ultraviolet (UV) protection materials. In this study, we investigated the effects of nano-TiO 2 particles on the UV-protective and structural properties of polypropylene (PP) textile filaments. Master batches of PP/TiO 2 nanoparticles were prepared by melt compounding before spinning, and filaments incorporating 0.3, 1, and 3% TiO 2 nanoparticles were spun in a pilot melt-spinning machine. The structural properties of the nanocomposite fibers were analyzed with scanning electron microscopy, X-ray diffractometry, differential scanning calorimetry, and tensile tests. The UV-protection factor was determined to evaluate the UVprotective properties of the filaments. In conclusion, although the structure and mechanical properties of the nanocomposite filaments were slightly affected by the addition of nano-TiO 2 , the UV-protective properties of the PP filaments improved after treatment with nano-TiO 2 , and the nanocomposite filaments exhibited excellent UV protection.

The number of efforts about modifying the properties of polymeric fibers by organic or inorganic particles has increased recently because of high-tech applications of textiles. In addition to these attempts, the discovery of nanotechnology also leads to the development of nanoparticles for various end uses such as nanocomposite fibers. In this article, we aimed to produce slow burning or flame retardant polypropylene filaments for carpet pile yarns by incorporating SiO 2 nanoparticles into polymer. Therefore, we present the preparation of filaments incorporating 0.3, 1, and 3% SiO 2 nanoparticles and investigate the effects of nanoparticles on the flame retardancy and structural behavior of filaments. Polypropylene and nanoparticles were compounded by melt-compounding using twin-screw extruder before spinning. Filaments with trilobal cross sections were spun using pilot melt spinning equipment. The structural properties of nanocomposite fibers were analyzed using X-ray difractometry, differential scanning calorymetry, scanning electron microscopy, and tensile tests. The flammability behaviors of filaments were evaluated using the oxygen index method. The effect of nanoparticles on structural properties and flame retardancy behaviors of filaments were summarized and discussed. V

We report a case of Hutchinson-Gilford progeria syndrome (HGPS). The patient showed the characteristics of scleredema at the age of 2.5 months but developed all the manifestations of HGPS gradually until 10 months old. The possibility of development of HGPS should by considered in any case of scleredema at birth or in early infancy.

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Purpose -The purpose of this paper is to propose a theoretical model to predict the mechanical behaviour of needle punched heavy geotextiles in uniaxial tensile test. Design/methodology/approach -The model was constructed using theory of layered composite materials and finite element method. The properties of a reference fabric were used as initial data in theoretical calculations and a commercially available finite element program was chosen to carry out stress analysis. A comparison is made between theoretical calculations and experimental data to evaluate the deformation mechanism of geotextile fabrics in uniaxial tensile test. Findings -The results indicate that compatible data were predicted in terms of stress values and stress distribution of fabrics. The inconstant lateral contraction of nonwoven fabrics in tensile test is also successfully simulated by the model. However, in the case of elongations, the model could not predict the strains of heavy geotextiles accurately. Originality/value -The study aims at predicting the mechanical behaviour of needle punched heavy geotextiles by using the structural and mechanical properties of a "reference fabric" instead of constituent fiber properties.