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RISS 인기검색어
- 검색키워드
- 저자 : Amin Ebrahimzade (검색결과 3 건)
- 무료
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Probing the Photoluminescence Characteristics and Dyeability of Dyed Luminous Polypropylene Fabric
Amin Ebrahimzade,Rouhollah Semnani Rahbar,Mohammad Reza Mohaddes Mojtahedi,Milad Valibeigi 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
Luminous polypropylene fibers were melt-spun using different amounts of phosphor strontium aluminate(SrAl2O4: Eu+2, Dy+3) as luminescent agent. The knitted fabrics were then prepared from these fibers and dyed with variousdisperse dyes, acid and basic dyes. Photoluminescence and dyeability properties of the fabrics were studied. According to thephotoluminescence spectroscopy results, a broad peak with a maximum at around 540 nm was observed for luminous fabricsafter exciting at the wavelength of 400 nm, indicating that luminescent particles were not destroyed or destructured duringmasterbatch preparation and melt spinning process. The dyeing performance of luminous PP fabrics was further evaluated bythe color strength (K/S values) and photographic images. Interesting improvement of the K/S values was observed for theluminous fabric dyed with acid dye. The results showed that the ionic charge of dye used and its molecular size could beaffected the afterglow intensity of dyed luminous fabrics. Although dyed luminous fabrics showed afterglow properties, theafterglow intensity diminished by enhancing the dyeability because of increased interference of dye molecules withluminescent particles. The color coordinates L*, a*, b*, c*, and ΔE specifications of dyed fabrics were marginally influenced inthe presence of luminescent particles.
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Improving the Dyeability of Polypropylene Fibers Using Nanoclay and Plasma Treatment
Aminoddin Haji,Rouhollah Semnani Rahbar,Amin Ebrahimzade 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5
In this study, polypropylene (PP) and polypropylene/nanoclay composite multifilament yarns with differentnanoclay contents were prepared by melt spinning. The knitted fabrics were then made from these yarns and subjected tooxygen plasma treatment for 5 min. The samples were dyed with a disperse dye and an acid dye and the color strength, colorcoordinates, and fastness properties of the dyed samples were compared. The effect of plasma treatment on the surfacechemistry and morphology of the samples was evaluated using Fourier-transform infrared spectroscopy (FTIR) and atomicforce microscopy (AFM) analyses, respectively. FTIR analysis confirmed the introduction of oxygen-containing groups onthe surface of the plasma-treated samples. AFM images confirmed etching of the fibers, and the surface roughness of thefibers increased significantly after plasma treatment. The incorporation of nanoclay in the multifilament yarns improved thedyeability of the polypropylene/nanoclay composite fibers with disperse and acid dyes. The optimum amount of the nanoclayfor obtaining the highest color strength was 2 wt% and 1 wt%, for dyeing with the disperse and acid dye, respectively. Plasmatreatment enhanced the dyeability and fastness properties of the fibers. The highest K/S values obtained on plasma-treated PP/nanoclay samples were 1.27 and 10.88 for acid and disperse dyes, respectively. The fastness properties of the samples dyedwith the acid dye were generally lower than those of dyed with the disperse dye. The highest washing, dry rubbing, and lightfastness properties were obtained on plasma-treated and disperse-dyed PP/nanoclay (2 %) sample, which were 4-5, 3, and 5,respectively.
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Mohammad Reza Habibolah Zargar,Atefeh Ghaffarian,Amin Ebrahimzade,Ahmad Mousavi Shoushtari 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
In the present work, a systematic study of the variables affecting the production of polypropylene (PP)/poly(trimethylene terephthalate) (PTT) blend fibers such as the PTT and PP-g-MA compatibleizer ratios and take-up speed inthe melt-spinning process was done. Modeling of the melt-spinning process was carried out by using a statistical approachbased on response surface methodology (RSM) to achieve a mathematical model. The formation of the fibrillar structuresthrough different steps of fiber formation was confirmed by scanning electron microscopy (SEM). The lowest mean diameterof nano-fibrils was achieved to be 63 nm, for the hot-drawn fibers consisting of 10 wt.% of PTT. The synergetic effect of thepresence of PTT dispersed phase on the mechanical properties of PP fibers as a matrix was verified by observing a positivedeviation from the blends linear law for the samples with 10 wt.% of PTT. The rheological evaluations suggested theformation of a fibril structure in the blends. The X-ray diffraction spectroscopy and DSC results showed that the presence ofPTT significantly influenced the crystallinity of PP. Moreover, results indicated that the average crystal size of the PP matrixphase was affected by the presence of the PTT dispersed phase, which also confirmed its nucleating effect in the blend.
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