Advanced Materials Research Vols. 332-334

Abstract: In this study, electromagnetic radiation (EMR) shielding fabric was coated by Carbonyl Iron and Nickel powder. X-ray diffraction (XRD) measure was applied to test the existence of Carbonyl Iron and Nickel. In order to study protective performance of EMR shielding fabric for living body, tests on biological effect protection were proceeded respectively using EMR shielding fabric, stainless steel fiber blend fabric and common fabric of the same specification. The results showed that colony forming unit-granulocyte and macrophage (CFU-GM), which expressed the ability of the mice’s hematopoietic function, were obviously improved after using shielding fabric. And all the other biological characterizations of the life that covered the EMR shielding fabric and stainless steel fiber blend fabric were better than that that covered common fabric. Moreover, The EMR shielding fabrics had better protective effect than pure stainless steel fiber blended fabric. The parameters of the Carbonyl Iron and Nickel coated and the stainless steel fiber were the significantly factors to affect the shielding property.

Abstract: In this paper, we have bubble-electrospun PLA nanofibers to analyze and investigate the effect of different electrical conductivities by adding different amounts of LiCl into the PLA/DMF solutions on the morphology and diameter of the nanofibers. As a result, it is found that when the mass fraction of LiCl is 0.5%, we can obtain the smallest mean diameter of bubble-electrospun nanofibers with more smooth surface and uniform fineness. Moreover, both improving and reducing LiCl concentration brings on coarse nanofibers surface and poor diameter distribution.

Abstract: CSCM in fabric is an important content of fabric geometry. Based on research work in the past, cross-sectional configuration of yarn in some real fabrics is observed. Several models can be used to describe it: round, ellipse and so on. Fabric with multiple weave-points below the same float can appear overlapping, staving and abnormal deformed yarns, especially serious in fabric with high density. So it’s unscientific to unify cross-sectional configuration to certain model, although there exist round, ellipse configuration in real fabric, triangle, cuneiform, sector are also observed in compacted fabric with multiple weave points. These models above are just examples only. In this case, it’s no meaningful to analyze the cross-section of mono-yarn. So combined CSCM is proposed to express yarn configuration in compacted fabric with multiple weave points.

Abstract: In the present work, poly(methyl methacrylate) (PMMA)/ montmorillonite (MMT) composite microfibers were firstly prepared by in situ emulsion polymerization combined with electrospinning, and then treated by oxygen plasma to create microfibers membrane with increased hydrophilicity and to further improve its immobilization. Conditions of plasma treatment were found for maximum laccase immobilized yield on these plasma treated microfibers’ surfaces. Scanning electron microscope (SEM) was used to investigate surface morphology of PMMA/O-MMT composite microfibers before and after plasma treatment, while the wetting behavior was studied by drop shape analyzer. The degradation of reactive red X-3B was tested to indicate the immobilization yield of laccase indirectly. The results showed that plasma treatment greatly enhanced microfibers’ surface roughness and hydrophilicity. Laccase was physically adsorbed onto the surface of PMMA/MMT composite microfibers. Besides, under the conditions of 90s(60w, 80w, 100w), the microfibers get the best immobilization yield.

Abstract: The precise characterization of the microstructure of bundle is essential for an accurate determination of their properties and behavior. This paper presents a study on the microstructure of continuous fiber bundles by Serial Sectioning Method. Bundle is firstly cured by resin to keep the fiber spatial configuration in the bundle. A series of cross-section images vertical to the bundle direction are captured and polished enough to take digital photographs by the Charge-coupled Device (CCD) microscope. A 3D solid microstructure of the bundle is implemented by linking the correspondent circle for separate fiber in the 3D solid software Pro/E. Reconstructed bundle structure truly represents the spatial configuration of the fibers in the bundle.

Abstract: This paper presents a method to fabricate textile structural electrodes from material preparation to electrode structure design and testing. Silver/Silver Chloride (Ag/AgCl) was assumed to be the best electrode material system for acquisition of biopotential signals. A AgCl coating has been grown on silver (Ag) coated multilament yarn to form Ag/AgCl combination using constant voltage electrolytic deposition in 0.9% wt sodium chloride bath. The AgCl thickness could be controlled by varying processing time (t) and voltage (V). Surface morphology of the treated fibres were studied by scanning electron microscopy (SEM) which revealed that AgCl grain size became bigger and denser as increased processing time and voltage. The impedance of the treated fibre was analyzed by electrochemical impedance spectroscopy (EIS) analysis from 0.1H z to 1000H z which shown that impedance also increased with processing time and voltage. The prepared Ag/AgCl multilament yarn was fabricated into wearable electrode using embroidery technique. ECG testing confirmed that the electrodes made from treated fibre can acquire high quality signal.

Abstract: The three-dimensional structure of high-performance fiber bundles are of paramount importance for their study in lateral compression mechanism. Modeling of their true morphologies is still fields of focus research, yet to be exhausted. In this paper, ANSYS were utilized to develop three-dimensional numerical model of fiber bundle on the computer in the way of simulation. This approach is enabled by the finite element packages. It is possible to simulate the true material morphology directly. The key issues of the simulation are to keep fiber volume fraction always a constant value and to ensure no intersection between fibers. This work can simulate the stochastic generation-growth of high-performance fiber bundle and reproduce morphology of fiber bundle on micron scale well and thereby provide reliable information for the study on the lateral compression mechanism in the future.

Abstract: This article reports the analysis method of the factors effected bond qualities of fabric composites. The parameters of fabrics and interlinings are analyzed by principal analysis and eight principal components are obtained through this method. The obtained eight components can reflect 96.649% information of all original parameters. For the first principal component, the parameters for which percentage exceeded 70% were all the parameters about interlining, those of which information about fabric were important for the second component, the main parameters of the third principal component the warp flex and the shear ability of the fabric, As to the fourth principal component, the parameters considered were interlining warp extension and interlining weft extension, The fifth component was the shear and weft flex ability of the fabric, The sixth component was the warp shrinkage ability of the interlining, Fabric warp shrinkage was the only parameter of which the percentage exceeded 50% in the seventh component, The fabric warp bending rigidity was the important element for the eighth principal component.

Abstract: An polyacrylonitrile fiber is one that contains at least 85% by mass of acrylonitrile comonomer in the polymer chain. The nitrile group (-C≡N) in polyacrylonitrile fiber is converted to carboxyl group(–COOH) after hydrolysis in NaOH aqueous solution.This research explores the hydrolysis of copolyacrylonitrile fiber in sodium hydroxide solution and characterization by chrome yellow method. The optimum hydrolytic technology is sodium hydroxide mass fraction is 12%, the time of hydrolysis is 10min, the temperature of hydrolysis is 80°C. In addition, the surface morphology of the polyacrylonitrile fiber and the modified polyacrylonitrile fiber were observed by SEM. The strength of the hydrolysed fiber is decline and the moisture regain is increased compared with the polyacrylonitrile fiber.

Abstract: The influences of inner layer′s (spacer yarn′s) pattern, surface structure of fabric, thickness, and spacer yarn′s diameter on compression resistance of warp knitted spacer fabric were investigated in the study. The compression tests involving 10 samples were carried out by TexLab Precision Instruments CT250 based on Chinese standard FZ/T01051.2-1998. The results show that inner layer′s pattern and surface structure affect the compression resistance of spacer fabric by changing the inclination angle of spacer yarn, the closer spacer yarn keep vertical, the better compression resistance of fabric. The laws of force exerted on spacer yarn followed by fabric′s thickness differ according to compression rate, the compression resistance increases as the thickness increases when the deformation of fabric is small (less than 4.90%), but decreases when the deformation is large enough (more than 19.20%). The diameter of spacer yarn has apparent effect on compression resistance, and the fabric with finer spacer yarns has lower compression resistance.