Guangzhou Fiber Product Testing Institute

China

Guangzhou Fiber Product Testing Institute

China

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Feng W.,Sun Yat Sen University | Feng W.,Guangzhou Fiber Product Testing Institute | Jiang R.,Sun Yat Sen University | Chen B.,Sun Yat Sen University | Ouyang G.,Sun Yat Sen University
Journal of Chromatography A | Year: 2014

A novel fiber-assisted emulsification microextraction (FAEME) method was developed for the determination of eight aromatic amines (AAs) in aqueous samples. In this method, the extraction solvent (100μL chlorobenzene) and the dispersive material (1.0mg kapok fiber fragments) were added successively into the aqueous sample (5.0mL), and then the mixture was emulsified by ultrasound to form the cloudy solution. Phase separation was performed by centrifugation, and the sedimented phase was transferred to micro-inserts with a microsyringe for analysis. All variables involved in the extraction process were identified and optimized. By coupling the analysis with gas chromatography-mass spectrometry (GC-MS), excellent detection limits (0.01-0.2μgL-1), good precision (RSDs, 3.33-6.56%) and linear ranges (0.10-160μgL-1 and 1.0-160μgL-1) were obtained. Compared with the traditional solvent-emulsification method, the extraction recoveries of the proposed method were much higher. Satisfactory recoveries were achieved when the method was used for the analysis of AAs in spiked real water samples. © 2014 Elsevier B.V.


Chen B.,Sun Yat Sen University | Chen B.,Shenzhen Key Laboratory of Detection Technology for Food Safety | Jin B.,Shenzhen Key Laboratory of Detection Technology for Food Safety | Jiang R.,Sun Yat Sen University | And 4 more authors.
Analytical Methods | Year: 2014

Dispersive liquid-liquid microextraction (DLLME) coupled with gas chromatography-mass spectrometry (GC-MS) was used to quantify and semi-quantify 304 pesticides and related organic pollutants in surface water. Extraction parameters including types and volumes of extraction solvent, disperser solvent, and the amount of salt addition were optimized to obtain highest recoveries and lowest detection limits. A mixture of 35 μL carbon tetrachloride (extraction solvent) and 1 mL acetone (disperser solvent) was added into 5 mL of water sample. After agitation and centrifugation, 20 μL of the sedimented phase was mixed with 1 μL of the internal standard solution, and 1 μL of the final solution was injected into GC-MS for separation and quantification. The enrichment factors ranging from 42- to 299-fold were obtained for all compounds. The limits of detection ranged from 0.001 to 1.125 μg L-1, and the limits of quantification ranged from 0.003 to 3.75 μg L-1. Of all 304 compounds, 90 compounds showed recoveries from 60% to 120% and RSDs lower than 20%. The proposed method is very low cost, rapid and convenient, and could be an effective method for the monitoring of multiple pesticides in surface water. © The Royal Society of Chemistry 2014.


Feng W.,Sun Yat Sen University | Feng W.,Guangzhou Fiber Product Testing Institute | Zhu Y.,Guangzhou Fiber Product Testing Institute | Ouyang G.-F.,Sun Yat Sen University
Fenxi Huaxue/ Chinese Journal of Analytical Chemistry | Year: 2015

A simple and efficient method, based on ultrasound-assisted polymer surfactant-enhanced emulsification microextraction (SA-USAEME) followed by gas chromatography-mass spectrometry (GC-MS), has been developed for the determination of eight aromatic amines (AAs) in aqueous sample. The main parameters affecting the performance of the proposed method were optimized, and the optimum conditions were obtained as follows: 150 μL of extractive solvent (dichloroethane) 150 μL, polymer surfactant (sodium alginate) of 0.20 g L-1, pH 7.0, salt addition of 3%, and ultrasound time of 1 min. Under the optimal conditions, the linear ranges were 0.1-200 μg L-1 for 3,3'-dichlorobenzidine, 0.3-200 μg L-1 for 2,4,5-trime concentration thylaniline, 4-chloro-o-toluidine, 3,3'-dimethyl-4,4'-diaminodiphenylmethane, 3,3'-dimethylbenzidine and 4,4'-methylene-bis-(2-chloroaniline), and 0.5-200 μg L-1 for 4-aminoazobenzene and 3,3'-dimethoxybenzidine. The correlation coefficients (R2) and detection limits were 0.9961-0.9997 and 0.08-0.3 μg L-1 respectively. The intra- and inter-RSD were less than 10.3% and 11.9%. Additionally, the proposed method could be applied to the analysis of AAs in water sample respectively collected from tap water and river water. Compared with the common SA-USAEME, conventional surfactant was replaced with water-soluble polymer surfactant in this method to solve the problems of potential pollution and decrease the GC limitation since the polymer surfactant were natural and insoluble in extractive solvent. Compared with solid phase extraction, the proposed method enjoyed simplicity of operation and low cost. Therefore, it is an alternative method that could be widely used for the analysis of trace level of AAs in water sample. Copyright © 2015, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. Published by Elsevier Limited. All rights reserved.


Xie J.,Donghua University | Xie J.,Guangzhou Fiber Product Testing Institute | Yao L.,Donghua University | Xu F.,Donghua University | And 4 more authors.
Composites Part B: Engineering | Year: 2014

A PMR polyimide composite reinforced with three-dimensional (3D) woven basalt fabric is fabricated for medium high temperature applications. The PMR polyimide matrix resin is derived from 4,4′-methylenediamine (MDA), diethyl ester of 3,3′,4,4′-oxydiphthalic (ODPE) and monoethyl ester of Cis-5-norbornene-endo-2,3-dicarboxylic acid (NE). The rheological properties of the PMR polyimide matrix resin are investigated. Based on the curing reaction of the PMR type polyimide and the rheological properties, an optimum two-step fabrication method is proposed. The three dimensional fabric preforms are impregnated with the polyimide resin in a vacuum oven at 70 °C for 1 h followed by removing the solvent and pre-imidization. The composites are then consolidated by an optimized molding procedure. Scanning electron microscopy analysis shows that needle shaped voids are generated in yarns and the void volume fraction is 4.27%. The decomposition temperature and the temperature at 5% weight loss of the composite post-cured at 320 °C for 24 h are 440 °C and 577 °C, respectively. The dielectric constant and the dielectric loss of the composite are measured by circular cavity method at 7-12 GHz. The tensile strength and the modulus in the warp direction of the composite are 436 MPa and 22.7 GPa. The composite shows a layer-by-layer fracture mode in three-point bending test. The flexure strength and modulus in the warp direction of the composite are 673 MPa and 27.1 GPa, respectively. © 2014 Elsevier Ltd. All rights reserved.


Gao X.Y.,Guangzhou Fiber Product Testing Institute | Zhang P.,Guangzhou Fiber Product Testing Institute
Advanced Materials Research | Year: 2014

Three different types of PA66 uncoated airbag fabrics are selected, dynamic permeability and deformation are measured by dynamic air permeability testing measurement. Average dynamic air permeability and exponent of dynamic air permeability are used to describe dynamic permeability; bulging curve and biaxial strain/stress curve are used to describe deformation. Testing results showed great useful to airbag products. © (2014) Trans Tech Publications, Switzerland.


Li F.,Donghua University | Luo S.,Donghua University | Luo S.,Guangzhou Fiber Product Testing Institute | Zhang J.,Donghua University | Yu J.,Donghua University
Journal of Thermal Analysis and Calorimetry | Year: 2013

In this paper, studies of the temperature dependence for spherulitic growth of PBST copolyester bearing 70 mol% butylene terephthalate units (named as PBST-70) ranged from 70 to 170 C were first reported based on the Lauritzen-Hoffman secondary nucleation theory. The results showed that maximum spherulitic growth rate of PBST-70 was obtained under crystallization temperature of 90 C, and more perfect spherulites were formed via increasing isothermal crystallization temperature by POM measurement. The classical regime I → II and regime II → III transitions occurred at the temperatures of 150 and 110 C, respectively, using the empirical universal values of U*= 6300 J mol-1 and T ∞ = T g - 30 K. Moreover, the effects of isothermal crystallization temperature on crystal lamellar thickness, thermal and tensile properties of PBST-70 were systematically investigated by small angle X-ray scattering, differential scanning calorimeter, and strength tester. The results indicated that the crystal lamellar thickness increased by increasing isothermal crystallization temperature. The endothermic peak shifted to higher temperature and the tensile properties of PBST-70 were enhanced under higher isothermal crystallization temperature. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Zhu R.,Guangzhou Fiber Product Testing Institute | Zhang P.,Guangzhou Fiber Product Testing Institute | Nie F.,Guangzhou Fiber Product Testing Institute
Advanced Materials Research | Year: 2013

Testing standards of electrostatic property of industrial textile were analyzed via comparing the principles and apparatuses, as well as their advantages and disadvantages. And the correlation study on different standards showed that testing results of different materials according to the same method had similar change trend, but no evidence proved a definite linear relationship of three test methods. © (2013) Trans Tech Publications, Switzerland.


Ji F.,Donghua University | Qiu Y.,Donghua University | Xie J.,Guangzhou Fiber Product Testing Institute | Sun S.,Donghua University
Advanced Materials Research | Year: 2013

It has long been a problem how to objectively evaluate the wet wearing comfortability of fabrics. In this paper a novel testing method was proposed, and an instrument was designed and made. During the testing process, the fabric specimen first got saturated by "sweat" and adhered on the "skin", and then it was separated at due rate from the skin and the in time adhesion force-displacement curve was drawn simultaneously. When the fabric was totally separated from the skin, the maximum adhesion force and adhesion work were measured such as to objectively evaluate the adhesion properties of the fabric specimen. Six different kinds of fabrics were selected and tested. The results show that certain kind of fabric performs characteristic adhesion force-displacement curve, which should be explained through fabric materials and structures. Hence this method is effective in objectively reflecting the wet wearing comfortability of fabrics. © (2013) Trans Tech Publications, Switzerland.


Sui J.H.,Soochow University of China | Li Y.N.,Soochow University of China | Hu Q.P.,Guangzhou Fiber Product Testing Institute | Su M.,Soochow University of China
Advanced Materials Research | Year: 2013

Research of the processing technology to make the weft be curved shape in woven fabrics. We demonstrate the feasibility of using the tension method, the beating-up method, the yarn method to product weft-curved fabrics. Through weaving samples in laboratory, we discussed the actual effect and existing problems of the three methods, summarized the technical methods that we should choose to make weft-curved fabrics be in industrialized production and the new ideas to develop weft-curved fabrics. We believe: If we use the big-belly yarns containing PVA fibers to make weft-curved fabrics, its effect is the best and symbiotic defects are the most slightly. At the same time, with the low technical difficulty and high production efficiency, it should be the preferred technical approach to develop weft-curved fabrics. The technology to develop weft-curved fabrics is more suitable for the development of new staple products and yarn-dyed striped grid, new jacquard products. © (2013) Trans Tech Publications, Switzerland.


Nie F.M.,Guangzhou Fiber Product Testing Institute | Zhu R.T.,Guangzhou Fiber Product Testing Institute | Wu S.H.,Guangzhou Fiber Product Testing Institute | Zhang P.,Guangzhou Fiber Product Testing Institute
Advanced Materials Research | Year: 2013

Domestic and international testing methods of flammability property of textile, such as oxygen index method, vertical test method, 45 degree test method, horizontal test method and cone calorimeter method, were analyzed via comparing the principles, as well as their requirements of different acts and standards. To comprehensively evaluate the burning behavior of textiles, appropriate combination of methods should be chosen according to the practical application. © (2013) Trans Tech Publications, Switzerland.

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