Non-woven Fabrics (non-woven + fabric)

Distribution by Scientific Domains


Selected Abstracts


Evaluation of a Non-Woven Fabric Coated with a Chitosan Bi-Layer Composite for Wound Dressing

MACROMOLECULAR BIOSCIENCE, Issue 5 2008
Bai-Shuan Liu
Abstract This study presents a novel design of an easily stripped bi-layer composite that consists of an upper layer of a soybean protein non-woven fabric coated with a lower layer, a genipin-crosslinked chitosan film, as a wound dressing material. This study examines the in vitro properties of the genipin-crosslinked chitosan film and the bi-layer composite. Furthermore, in vivo experiments are conducted to study wounds treated with the composite in a rat model. Experimental results show that the degree of crosslinking and the in vitro degradation rate of the genipin-crosslinked chitosan films can be controlled by varying the genipin contents. In addition, the genipin contents should exceed 0.025 wt.-% of the chitosan-based material if complete crosslinking reactions between genipin and chitosan molecules are required. Water contact angle analysis shows that the genipin-crosslinked chitosan film is not highly hydrophilic; therefore, the genipin-crosslinked chitosan layer is not entangled with the soybean protein non-woven fabric, which forms an easily stripped interface layer between them. Furthermore, this new wound dressing material provides adequate moisture, thereby minimizing the risk of wound dehydration, and exhibits good mechanical properties. The in vivo histological assessment results reveal that epithelialization and reconstruction of the wound are achieved by covering the wound with the composite, and the composite is easily stripped from the wound surface without damaging newly regenerated tissue. [source]


Calcium Phosphate Crystallization on Electrospun Cellulose Non-Woven Fabrics Containing Synthetic Phosphorylated Polypeptides

MACROMOLECULAR MATERIALS & ENGINEERING, Issue 5 2009
Shinya Hayashi
Abstract The preparation of electrospun non-woven fabrics composed of cellulose and synthetic phosphorylated polypeptides, copoly[Ser(PO3H2)XAspY]s (X:Y,=,100:0, 75:25, 50:50, 25:75), is described. The non-wovens were subjected to an alternate immersion in CaCl2 and Na2HPO4 solutions to induce crystallization of calcium phosphate. The deposited calcium phosphate crystals were analyzed by means of EDX analysis and WXRD. The amounts of calcium phosphate deposition are greater for the cellulose non-woven fabrics containing copoly[Ser(PO3H2)XAspY] than those of cellulose-only non-woven fabrics. These results indicate that copoly[Ser(PO3H2)XAspY] can entrap Ca2+ ions around the fine fiber matrix to accelerate crystallization of the calcium phosphate. [source]


Blood cell separation using crosslinkable copolymers containing N,N -dimethylacrylamide

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 4 2007
Shizue Hayashi Natori
Abstract Amphiphilic copolymers using hydrophilic N,N -dimethylacrylamide (DMA), hydrophobic methyl methacrylate (MMA) and a crosslinkable monomer, 3-methacryloyloxypropyl trimethoxysilane (MTSi), were synthesized and evaluated as coating materials for leukocyte removal filters for whole blood. When filters composed of non-woven fabrics were coated with crosslinked synthesized copolymers, the elution ratios of the copolymers to water were adequately low because of the crosslinking with trimethoxysilane groups of MTSi units in the copolymers. Filters coated with crosslinked poly(DMA- co -MTSi) having a 0.96 mole fraction of DMA units showed a 0.35,±,0.44% platelet permeation ratio and a logarithmic reduction of 4.0,±,0.68 for leukocytes. On the other hand, an increase in the content of MMA units in the DMA-containing copolymers improved the permeation ratio of the platelets dramatically. Filters coated with crosslinked poly(DMA- co -MMA- co -MTSi) containing a 0.39 mole fraction of MMA units and a 0.58 mole fraction of DMA units showed an 86,±,3.0% platelet permeation ratio and a logarithmic reduction of 2.1,±,1.2 for leukocytes. This indicates that an adequate content of hydrophobic monomer units, such as MMA units, is necessary for effective platelet permeation. Copyright © 2007 John Wiley & Sons, Ltd. [source]


Electromagnetic interference shielding by using conductive polypyrrole and metal compound coated on fabrics

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 8 2002
C. Y. Lee
Abstract Electromagnetic interference (EMI) shielding materials of complex type of conductive polypyrrole (PPy) as an intrinsically conducting polymer and silver-palladium (AgPd) metal compound coated on woven or non-woven fabrics are synthesized. From dc conductivity and SEM photographs of PPy/fabric complexes, we discuss charge transport mechanism and the homogeneity of coating on the fabrics. The EMI shielding efficiency of PPy/fabric and AgPd/fabric complexes is in the range of 8,,,80 dB depending on the conductivity and the additional Ag vacuum evaporation. The highest EMI shielding efficiency of PPy/fabric complexes vacuum-evaporated by Ag is ,80 dB, indicating potential materials for military uses. We propose that PPy/fabrics are excellent RF and microwave absorber because of the relatively high absorbance and low reflectance of the materials. Copyright © 2002 John Wiley & Sons, Ltd. [source]