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Liu X.,Donghua University | Ning Y.,Donghua University | Wang F.,Key Laboratory of Textile Science and Technology
Color Research and Application | Year: 2014

The effects of noncircular cross-section (NCCS) poly ethylene terephthalate (PET) filaments and its shape factor on deep-black-coloring of dyed fabrics were investigated by comparing to that of the circular cross-section PET ones. Indexes such as K/S, L* and Integ values were used for characterizing the deep-black-coloring effect on fabrics. The results indicated that fabrics made with NCCS PET filaments exhibited good deep-black-coloring effects. The calculated shape factor of the NCCS PET fiber had a significant correlation with the degree of deep-black-coloring exhibited by the fabric made from the fibers. A qualitative optical analysis of the NCCS PET fibers was carried out to explain the causes of the deep-coloring of the NCCS fibers. This analysis implies that the contours of the NCCS fiber composed of surfaces with varied curvature increase the scattering of light by lowering specular reflection and increasing interior reflected and refracted light. This, in turn, strengthens the deep-coloring effect. © 2013 Wiley Periodicals, Inc.


Li C.-H.,Donghua University | Li C.-H.,Dezhou University | He J.-X.,Key Laboratory of Textile Science and Technology
Journal of Cleaner Production | Year: 2013

In this research, a facile process combined chitosan adsorption and UV-Fenton advanced oxidation process (CAAOP) has been developed for the treatment and reuse of spent acid dyebaths. The acid dyes in the spent dyebaths are completely removed through the adsorption column filled with chitosan, while most of sodium sulphate and Peregal O-25 (nonionic organic surfactant) can pass through the adsorption column with the water. Although the resulting recycled spent acid dyebaths are reused over ten times as new dyebaths for dyeing with C.I. Acid Red 1, the changes of the color differences and the relative unlevelness properties on dyed fabrics are still remained within the acceptable levels. That is also true for the other shade dye, namely C.I. Acid Yellow 11, in the 11th recycling cycle. As a result, an average saving of 87.4%, 91.7% and 50.1% for water, sodium sulphate and Peregal O-25, respectively, is achieved with the reuse process for the total eleven dyebaths. The exhausted chitosan can be easily recovered by dilute alkali as a desorbing agent, and the emissions from the two eluted concentrates treated with UV-Fenton are found to meet the most stringent emission standards for both COD and color in China. Results reveal that CAAOP is a promising process for the treatment and reuse of textile dyeing wastewaters, which can benefit the environment and reduce the operating cost. © 2013 Elsevier Ltd. All rights reserved.


Zhao Q.,Donghua University | Sun J.,Donghua University | Li J.,Donghua University | He J.,Donghua University | He J.,Key Laboratory of Textile Science and Technology
Catalysis Communications | Year: 2013

Homer-Wadsworth-Emmons (HWE) reaction of diethyl benzylphosphonate (DEBP, pKa = 27.55) with aldehyde was performed in a solid-liquid phase-transfer catalysis (SL-PTC) system using sodium hydroxide as the solid phase. Various parameters that influenced the pseudo-first-order rate constant including stirring speed, catalysts, salt, water and temperature were investigated to explore the process of the generation and transfer of the active intermediate. A reasonable interfacial mechanism of the PTC reaction of the weakly acidic substrate was proved for the first time. HWE reactions under SL-PTC conditions showed high activity and geometric selectivity. It is anticipated that this simple and controllable synthesis method should provide a new idea for HWE reaction in chemical industry. © 2013 Elsevier B.V.


Jiang Q.,Key Laboratory of Textile Science and Technology | Jiang Q.,Donghua University | Wang X.,North Carolina State University | Zhu Y.,North Carolina State University | And 3 more authors.
Composites Part B: Engineering | Year: 2014

Carbon nanotubes (CNTs) have high strength and modulus, large aspect ratio, and good electrical and thermal conductivities, which make them attractive for fabricating composite. The poly(biphenyl dianhydride-p-phenylenediamine) (BPDA/PDA) polyimide has good mechanical and thermal performances and is herein used as matrix in unidirectional carbon nanotube composites for the first time. The strength and modulus of the composite increase by 2.73 and 12 times over pure BPDA-PDA polyimide, while its electrical conductivity reaches to 183 S/cm, which is 1018 times over pure polyimide. The composite has excellent high temperature resistance, and its thermal conductivity is beyond what has been achieved in previous studies. The improved properties of the composites are due to the long CNT length, high level of CNT alignment, high CNT volume fraction and good CNT dispersion in polyimide matrix. The composite is promising for applications that require high strength, lightweight, or high electrical and thermal conductivities. © 2013 Elsevier Ltd. All rights reserved.


Li X.,Key Laboratory of Textile Science and Technology | Li X.,Donghua University | Li X.,Shaoxing University | Qiu Y.,Key Laboratory of Textile Science and Technology | Qiu Y.,Donghua University
Applied Surface Science | Year: 2012

The influence of the He/O 2 atmospheric pressure plasma jet pre-treatment on subsequent NaHCO 3 desizing of blends of starch phosphate and poly(vinyl alcohol) on cotton fabrics is investigated. Atomic force microscopy and scanning electron microscopy analysis indicate that the surface topography of the samples has significantly changed and the surface roughness increases with an increase in plasma exposure time. X-ray photoelectron spectroscopy analysis shows that a larger number of oxygen-containing polar groups are formed on the sized fabric surface after the plasma treatment. The results of the percent desizing ratio (PDR) indicate that the plasma pretreatment facilitated the blended sizes removal from the cotton fabrics in subsequent NaHCO 3 treatment and the PDR increases with prolonging plasma treatment time. The plasma technology is a promising pretreatment for desizing of blended sizes due to dramatically reduced desizing time. © 2012 Elsevier B.V. All rights reserved.


Qu J.G.,Donghua University | Li N.N.,Donghua University | Liu B.J.,Donghua University | He J.X.,Donghua University | He J.X.,Key Laboratory of Textile Science and Technology
Materials Science in Semiconductor Processing | Year: 2013

A series of BiVO4/bentonite catalysts calcined at different temperatures were prepared by the solution combustion method and characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET) specific surface area and ultraviolet-visible diffuse reflectance (UV-vis DRS) spectra. The results of BET analysis showed that BET specific surface area of BiVO4/bentonite crystallite decreased with increasing calcination temperature. The results of XRD, FE-SEM and UV-vis DRS analysis indicated that BiVO4 on bentonite calcined at 300 C was in a monoclinic structure with a diameter of around 30 nm, as well as strong absorbance in a region of 350-500 nm. The photocatalytic activities of as-prepared catalysts were discussed by the degradation of C.I. Reactive Blue 19 (RB19) under simulated solar irradiation. It was found that the catalyst could be separated from aqueous suspensions by sedimentation after reaction, and maintained almost the same activity after being used five times. © 2012 Elsevier Ltd.


Zhou J.,Donghua University | Wang J.,Key Laboratory of Textile Science and Technology
Textile Research Journal | Year: 2013

In this paper, we present a new fabric defect detection algorithm based on learning an adaptive dictionary. Such a dictionary can efficiently represent columns of normal fabric images using a linear combination of its elements. Benefiting from the fact that defects on a fabric appear to be small in size, a dictionary can be learned directly from a testing image itself instead of a reference, allowing more flexibility to adapt to varying fabric textures. When modeling a test image using the learned dictionary, columns involving anomalies of the test image are likely to have larger reconstruction errors than normal ones. The anomalous regions (defects) can be easily enhanced in the residual image. Then, a simple threshold operation is able to segment the defective pixels from the residual image. To adapt more defects, especially some linear defects, we rotate the test image by a slight degree and re-analyze the rotated image. Compared to the Fourier method, experimental results on 47 real-world test images with defects reveal that our algorithm is able to adapt to varying fabric textures and exhibits more accurate defect detection. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Dong X.,Donghua University | Zong Q.,Donghua University | Zong Q.,Key Laboratory of Textile Science and Technology | He J.,Donghua University | He J.,Key Laboratory of Textile Science and Technology
Dyes and Pigments | Year: 2013

The anisotropic surface properties of macroscopic single crystals of C.I. Disperse Yellow 114 have been investigated. The changing contact angles between the facets of the crystal and water by drop contact angle measurements are associated with chemical heterogeneities present on the surfaces. The surface free energy on four indexed crystal facets, calculated by using Wu's method, indicated the dispersive components of the surface energies for the different crystal facets are close to each other, while its polar components are quite distinct. The anisotropic nature of the physical properties of the dye crystals is attributed to the functional groups and their densities on the individual crystal surfaces. Moreover, the surface hydrophobicity of compressed discs of milled crystalline dye powder was increased in comparison to that of crystal facets to such an extent that it is very difficult to predict the crystal surface properties from the compressed discs. © 2012 Elsevier Ltd. All rights reserved.


Zhao Q.,Donghua University | Sun J.,Donghua University | Liu B.,Donghua University | He J.,Donghua University | He J.,Key Laboratory of Textile Science and Technology
Dyes and Pigments | Year: 2013

Stilbenes, 1,4-distyrylbenzenes and 4,4′-distyrylbiphenyls were synthesized via Horner-Wadsworth-Emmons (HWE) reaction in liquid-liquid (LL) and solid-liquid (SL) phase transfer catalysis (PTC) systems. The effect of the side reaction, reactants and the third phase on the activity of HWE reaction were investigated. For aldehydes bearing electron-donating substitute, the yields were more than 90% and the products were all (E)-isomers in both PTC systems. The SL-PTC system was milder than LL-PTC system for HWE reaction due to the different mechanisms. The side reaction of aldehyde was similar to Cannizzaro reaction, whereas the molar ratio of benzoic acid to benzyl alcohol as the products was not 1:1. The limited third phase was discovered to exist in LL-PTC system. In SL-PTC system, the third phase could increase substantially the reaction rate. Moreover, the aqueous phase in LL-PTC system could be reused four times without sacrifice of the yield and reaction rate. © 2013 Elsevier B.V. All rights reserved.


Liu B.,Donghua University | Wang Z.,Key Laboratory of Textile Science and Technology | He J.,Donghua University
Materials Letters | Year: 2012

Abstract A novel two-step process was developed to synthesize and deposit SiO2/TiO2 multilayer films onto the cotton fibers. In the first step, SiO2 particles on cotton fiber surface were synthesized via tetraethoxysilane hydrolysis in the presence of cotton fibers, in order to protect the fibers against photo-catalytic decomposition by TiO2 nanoparticles. In the second step, the growth of TiO2 nanoparticles into the modified cotton fiber surface was carried out via a sol-gel method at the temperature as low as 100 °C. The as-obtained SiO2/TiO 2 multilayer films coated on cotton fibers were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy and X-ray diffraction, respectively. © 2011 Elsevier B.V. All rights reserved.

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