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Peng S.,Key Laboratory of Textile Science and Technology | Peng S.,Donghua University | Gao Z.,Key Laboratory of Science and Technology of Eco Textiles | Sun J.,Key Laboratory of Textile Science and Technology | And 6 more authors.
Surface and Coatings Technology | Year: 2010

Moisture in the hydrophilic material may potentially influence the plasma treatment effect. In order to understand how moisture absorbed into PVA affects the result of plasma treatment to the polymer, atactic poly(vinyl alcohol) (PVA) films with moisture regain (MR) of 2.5%, 9.3% and 78.3% corresponding to 10%, 65% and 98% relative humidity (RH), respectively were exposed to atmospheric pressure plasma jet. Another group was annealed at 140 °C for 20 min to discern the thermal effects from those due to plasma treatment. Scanning electron microscope (SEM) showed lamellae crystal structures were on the surface of the films with 65% and 98% RH, while some bubbles or salt grains appeared on the surface of film with 10% RH and the annealed film respectively. X-ray photoelectron spectroscopy (XPS) analysis indicated that oxygen concentration increased for plasma treated films with 65% and 98% RH and decreased for that with 10% RH. X-ray diffraction analysis (XRD) shows an increase in crystallinity in all the plasma treated films. It was found that the solubility of all the treated films was decreased, especially for the plasma treated film under 98% RH which is nearly insoluble in water at 50 °C for 20 min. © 2009 Elsevier B.V. All rights reserved.

Shi X.,Key Laboratory of Science and Technology of Eco Textiles | Shi X.,Donghua University | Chen Z.,Key Laboratory of Science and Technology of Eco Textiles | Chen Z.,Donghua University | And 3 more authors.
European Polymer Journal | Year: 2014

Poly(l-lactide) (PLLA)/Methyl MQ (M: mono-functional silicon-oxygen unit R3SiO1/2, abbreviated as M; Q: tetra-functional silicon-oxygen unit SiO2, abbreviated as Q) Silicone Resin (Me-MQ) blends were prepared via a simple solvent evaporation method at various Me-MQ loadings. PLLA is high in strength and modulus, but its applications are limited partly due to its inherent brittleness. It is difficult to keep both toughness and transparency for modified PLLA without compromising its tensile strength and biocompatibility. In this study, we used biocompatible Me-MQ to toughen PLLA at low loadings. The elongation at break of neat PLLA is 7.8%. Tensile test showed that the elongation at break of PLLA blends increased to 67.9% and 217.7% at the loadings of 1 and 2 wt% Me-MQ respectively, with no sacrifice of their strength. UV-vis test showed the light transmittance of the films at the loadings of 1 wt% Me-MQ is almost the same as neat PLLA. © 2013 Elsevier Ltd. All rights reserved.

Han W.,Donghua University | Wang X.,Donghua University | Wang X.,Key Laboratory of Science and Technology of Eco Textiles
Advanced Materials Research | Year: 2011

In this article, a multi-objective optimization using genetic algorithms (GA) is proposed to optimize the coat-hanger die, combined with the finite element method. The manifold angle, the land height and the slot gap are chosen to be the optimized design parameters. The residence time and the coefficient of variation (CV) value of the flow velocity at the die outlet are regarded as the objective function. The optimal coat-hanger was chosen in the 30th generation among 20 individuals of each generation, which shows that the CV% value of the velocity at the die outlet is only 9.1% and residence time is 189s. © (2011) Trans Tech Publications, Switzerland.

Nurwaha D.,Donghua University | Han W.,Donghua University | Wang X.,Donghua University | Wang X.,Key Laboratory of Science and Technology of Eco Textiles
Journal of the Textile Institute | Year: 2013

This study describes the application of a hybrid neuro-fuzzy inference system to control electrospinning process and how to use this approach for developing an electrospun fiber quality prediction system. An adaptive neuro-fuzzy inference system model has been applied to the use of electrospinning process parameters to study the relationship between electrospinning processing parameters and electrospun fiber morphology. Fiber morphology has been predicted and the impact of each processing parameter has been investigated. It was found that four electrospinning process parameters including: polymer solution concentration, spinning distance, applied voltage, and volume flow rate are the most influential factors to the electrospun fiber morphology. It was observed that the relationship existing between electrospinning processing parameters and nanofiber morphology is nonlinear. © 2013 Copyright The Textile Institute.

Gao Z.,Key Laboratory of Textile Science and Technology | Gao Z.,Donghua University | Sun J.,Key Laboratory of Science and Technology of Eco Textiles | Peng S.,Key Laboratory of Textile Science and Technology | And 4 more authors.
Journal of Applied Polymer Science | Year: 2011

To investigate the effect of the gas composition of the plasma treatment on the surface modification of an atmospheric pressure plasma jet (APPJ), nylon 6 films were treated with APPJ with pure helium (He), He + 1% oxygen (O 2), and He + 2% O 2, respectively. Atomic force microscopy showed increased surface roughness, whereas X-ray photoelectron spectroscopy revealed increased oxygen contents after the plasma treatments. The plasma-treated samples had lower water contact angles and higher T-peel strengths than the control. The addition of a small amount of O 2 to the He plasma increased the effectiveness of the plasma treatment in the polymer surface modification in terms of surface roughness, surface oxygen content, etching rate, water contact angle, and bonding strength. © 2010 Wiley Periodicals, Inc.

Peng S.,Key Laboratory of Textile Science and Technology | Peng S.,Donghua University | Liu X.,Key Laboratory of Textile Science and Technology | Liu X.,Donghua University | And 7 more authors.
Applied Surface Science | Year: 2010

This paper studies the influence of moisture absorption of cotton fabrics on the effectiveness of atmospheric pressure plasma jet (APPJ) on desizing of polyvinyl alcohol (PVA). Cotton fabrics with three different moisture regains (MR), namely 1.8%, 7.3%, and 28.4% corresponding to 10%, 65%, and 98% of relative humidity respectively, are treated for 16 s, 32 s, 48 s, and 64 s. X-ray photoelectron spectroscopy analysis indicates that the plasma treated PVA has higher oxygen concentration than the control. Mass loss results show that the fabric with the highest MR has the largest mass loss after 64 s plasma exposure. Solubility measurement reveals that the sample with the lowest MR has the highest desizing efficacy and the percent desizing ratio reaches 96% after 64 s exposure plus a 20 min hot wash, which is shown as clean as the unsized sample through scanning electron microscopy analysis. The yarn tensile strength test results show that APPJ has no negative effect on fabric tensile strength. © 2010 Elsevier B.V. All rights reserved.

Lin L.,Donghua University | Zhou X.,Donghua University | Zhou X.,Key Laboratory of Science and Technology of Eco Textiles | Xing Z.,Donghua University | Wu Y.,Donghua University
Textile Research Journal | Year: 2016

For a poly(ethylene terephthalate) (PET)/cotton blended fabric, a reactive-type flame retardant 2, 3-dibromo-succinic anhydride (DBSA) was used to endow durable flame retardancy via the pad-dry-cure method. DBSA was synthesized via the addition reaction of maleic anhydride and bromine in ethyl acetate solution and extracted by solventing-out crystallization. DBSA was used to finish a cotton fabric firstly with sodium hypophosphite as the catalyst. Thermal behaviors and amount of DBSA that esterified with the cotton was determined. Pyrovatex CP new was applied as a comparison. It was speculated from the thermogravimetric analysis result that esterification of cellulose with DBSA worked similar to phosphate-ester at the initial stage of thermal decomposition. DBSA was also applied to PET and PET/cotton blended fabrics. Flame retardancy, thermal behaviors and durability of the finished fabrics were investigated. Evidence of the condensed phase effect of DBSA was also observed on PET and PET/cotton. © 2015, © The Author(s) 2015.

Zhao F.,Key Laboratory of Textile Technology | Zhao F.,Donghua University | Chen H.,Key Laboratory of Textile Technology | Chen H.,Donghua University | And 6 more authors.
Journal of Materials Science | Year: 2013

Filters used in membrane bioreactors (MBRs) for wastewater treatment are low in filtration efficiency and the filtration process using MBR is relatively expensive, when low turbidity of treated water is required. To improve the filtration efficiency, three dimensional (3D) orthogonal woven fabrics with textured weft yarns are developed as a filter media used in MBR. Compared with a regular high-density two dimensional fabric filter, the 3D filter with multilayer and tortuous porous structure allows for 1-3 times higher flux and two times more filtered amount of wastewater in 30 days, while still maintaining a stable effluence turbidity and COD removal efficiency. The potential of applying the novel 3D woven filter in MBR for efficient wastewater treatment is proved. © 2013 Springer Science+Business Media New York.

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