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Nondestructive damage sensitivity and reinforcing effect of functionalized carbon nanotube and nanofiber/epoxy composites using electro-micromechanical techniques

Nondestructive damage sensitivity and reinforcing effect of ...

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2004 MRS Fall Meeting

作者： Park, Joung-Man Jung, Jin-Kyu Kim, Sung-Ju Kim, Dae-Sik Lee, Jae-Rock Kim, Tae-Wook Department of Polymer Science and Engineering Engineering Research Institute Gyeongsang National University Jinju 660-701 Korea Republic of Fiber Science Program Cornell University Ithaca NY 14853-4401 United States Advanced Materials Division Korea Research Institute of Chemical Technology Yusong Taejeon 305-600 Korea Republic of Composite Materials Group Korea Institute of Machinery and Materials Chanwon 641-010 Korea Republic of

Nondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electromicromechanical technique. Carbon black (CB) was used only for the comparison. Electromicromechanical techniques were applied to obtain the fiber damage and stress transferring effect of carbon nanocomposites with their contents. Thermal treatment and temperature affected on apparent modulus and electrical properties on nanocomposites due to enhanced inherent properties of each CNMs. Coefficient of variation (COV) of volumetric electrical resistance can be used to obtain the dispersion degree indirectly for various CNMs. Dispersion and surface modification are very important parameters to obtain improved mechanical and electrical properties of CNMs for multifunctional applications. Further optimized functionalization and dispersion conditions will be investigated for the following work continuously. © 2005 Materials Research Society.

关键词： Carbon nanotubes

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Effects of needle-punch rate on properties of PET/Kevlar/LPET nonwoven geotextiles 4

Effects of needle-punch rate on properties of PET/Kevlar/LPE...

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4th International Workshop on Computer science and engineering-Winter, WCSE 2014

作者： Lin, Jia-Horng Li, Jia-Hsun Hsieh, Jing-Chzi Hsing, Wen-Hao Lou, Ching-Wen Laboratory of Fiber Application and Manufacturing Department of Fiber and Composite Materials Feng Chia University Taichung City40724 Taiwan School of Chinese Medicine China Medical University Taichung40402 Taiwan Department of Fashion Design Asia University Taichung41354 Taiwan Department of Ph. D Program in Civil and Hydraulic Engineering Feng Chia University Taichung City40724 Taiwan Department of Land Management Feng Chia University Taichung City40724 Taiwan Department of Textile Engineering Chinese Culture University Taipei11114 Taiwan Institute of Biomedical Engineering and Materials Science Central Taiwan University of Science and Technology Taichung40601 Taiwan

Geotextiles feature reinforcement, drainage, filtration, separation, and act as a moisture barrier, and are commonly used in civil and geotechnical engineering applications. Using nonwoven fabrics as geotextiles has become a recent trend;therefore, this study combines crimped polyester (PET) fibers, recycled Kevlar unidirectional selvage fibers, and low-melting-point PET (LPET) fiber to make PET/Kevlar/LPET nonwoven geotextiles, the mechanical properties of which are then examined. The test results show that the tensile strength and tearing strength of the PET/Kevlar/LPET nonwoven geotextiles increases as a result of an increasing needle-punch rate from 150 punches/min to 200 punches/min. The mechanical properties along the cross machine direciton (CD) of the nonwoven geotextiles is greater than that along the machine direction (MD). When the needle-punching rate exceeds 200 punches/min, the mechanical properties of the nonwoven geotextiles slightly decrease.

关键词： Needles

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Effects of Needle-Punch Depth on Properties of PET/LPET/Kevlar Nonwoven Geotextiles

Effects of Needle-Punch Depth on Properties of PET/LPET/Kevl...

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2nd International Conference on Advanced Composite Materials and Manufacturing engineering, CMME 2014

作者： Lin, Jia Horng Hsieh, Jing Chzi Li, Jia Hsun Hsing, Wen Hao Lou, Ching Wen Laboratory of Fiber Application and Manufacturing Department of Fiber and Composite Materials Feng Chia University Taichung City 40724 Taiwan School of Chinese Medicine China Medical University Taichung 40402 Taiwan Department of Fashion Design Asia University Taichung 41354 Taiwan Department of Land Management Feng Chia University Taichung City 40724 Taiwan Department of Ph. D Program in Civil and Hydraulic Engineering Feng Chia University Taichung City 40724 Taiwan The Department of Textile Engineering Chinese Culture University Taipei 11114 Taiwan Institute of Biomedical Engineering and Materials Science Central Taiwan University of Science and Technology Taichung 40601 Taiwan

ISBN: (纸本)9783038350651

Geotextile has been commonly used in civil and geotechnical engineering applications, and the majority of geotextiles is made of nonwoven fabrics. Therefore, this study combines crimped polyester (PET) fibers, recycled Kevlar unidirectional selvage fibers, and low-melting-point PET (LPET) fibers to form PET/Kevlar/LPET nonwoven geotextiles, and then examines how various neelde-punch depths influence mechanical properties of the resulting nonwoven geotextiles. The tensile strength, tearing strength, bursting strength, and static puncture resistance of the nonwoven fabrics increase as a result of an increase of 0.3 cm to 0.5 cm in needle-punch depth. However, an increase of 0.5 cm to 0.7 cm causes a slight decrease in all aforementioned properties. © (2014) Trans Tech Publications, Switzerland.

关键词： Needles

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Molecular design of shape-memory polymer fibers that are thermally responsive

Molecular design of shape-memory polymer fibers that are the...

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fiber Society 2015 Fall Meeting and Technical Conference - fibers: Where Tradition Meets Innovation

作者： Pasquinelli, Melissa A. Tallury, Syamal S. Pordeyhimi, Behnam Spontak, Richard J. Fiber and Polymer Science Program TECS North Carolina State University RaleighNC27695 United States Materials Science and Engineering North Carolina State University RaleighNC27695 United States Nonwovens Institute North Carolina State University RaleighNC27695 United States Chemical and Biomolecular Engineering North Carolina State University RaleighNC27695 United States ExxonMobil Chemical Co. BaytownTX77520 United States

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A diatrizoic acid derivative for N -acylation of amino acids

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Results in Chemistry 2025年 16卷

作者： Kousaku Ohkawa Hemdeep Kaur Tracy Nguyen Beatrice Mae Malvar Rebecca Back Chloe Jin Parisa Khosropour Shuichi Suzuki Frank P.K. Hsu Ichiro Yuki Division of Synthetic Polymers Institute of High Polymer Research Faculty of Textile Science and Technology Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Division of Bibliometrics and Social Implementation Institute for Fiber Engineering Interdisciplinary Cluster for Cutting Edge Research Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Department of Neurological Surgery University of California Irvine 200S Manchester St. Suite 210 Orange CA92868 USA AquaTeX Medical Inc. Irvine CA92617 USA Department of Neurosurgery The Jikei University Hospital 3 Chome-25-8 Nishi-Shinbashi Minato City Tokyo 105-8461 Japan

3,5-Bis(acetamido)-2,4,6-triiodobenzoic acid, aka diatrizoic acid (DTZOH), is a major compound for the radiopaque material research. Iodine elements at the 2,4,6-positions are the origin of the radiopacity, but the bulkiness of iodine frequently inhibits the nucleophilic attack to the 1-carboxylic carbon, resulting in a low yield when DTZOH is used as an acylation agent. In this study, the authors hypothesized that the 1-carboxylic oxygen is utilized as a nucleophile because of its freedom from iodine-shielding. The base-catalyzed esterification using tert -butyl α -bromoacetate and DTZOH formed the diatrizoyloxyacetic acid tert -butyl ester (DTZAc-O t Bu) and subsequent removal of the t Bu group using trifluoroacetic acid yielded the diatrizoyloxyacetic acid (DTZAcOH) in quantitative yield. Acylation of the primary amino groups of the β -alanine ethyl ester or N α - tert -butyloxycarbonyl- l -lysine tert -butyl ester using isobutyl chloroformate were satisfactory in about 85 mol% yields. Conformer search calculations suggested that among the three classes of condensation reagents, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide monohydrochloride, 1,1′-cabonyldimidazole, and isobutyl chloroformate, the mixed anhydride generated by the condensation of DTZAcOH and isobutyl chloroformate has the highest freedom in the nucleophile approach direction and the lowest hindrance to the nucleophilic center. DTZAcOH is a feasible acylating agent of primary amino groups and inspires new designs of the functional X-ray shielding materials.

关键词： Diatrizoic acid derivatives N-acylation of amino acid derivatives Conformer search calculation

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Novel Atmospheric plasma enhanced Silk Fibroin nanofiber/Gauze composite wound dressings

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Journal of fiber Bioengineering and Informatics 2012年第3期5卷 227-242页

作者： Nawalakhe, Rupesh Shi, Quan Vitchuli, Narendiran Bourham, Mohamed A. Zhang, Xiangwu Mccord, Marian G. Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States Department of Nuclear Engineering North Carolina State University Raleigh NC 27695-7909 United States Joint Department of Biomedical Engineering North Carolina State University Raleigh NC 27695-7115 United States University of North Carolina Chapel Hill NC 27599 United States

In this work, Silk Fibroin (SF) nanofibers were electrospun onto plasma-treated 100% cotton gauze bandages to form a novel silk-gauze composite wound dressing. Atmospheric pressure plasma pre- and post- treatments were used to increase the adhesion between the SF nanofibers and cotton substrates. The adhesion of the nanofibers to the substrates was assessed by qualitative and quantitative techniques. Plasma pre-treatment of the substrate with 100% helium and 99% helium/1% oxygen plasmas showed up to a 50% increase in the force required to peel off the nanofiber layer. This force was further increased up to 75% after pre- as well as post-plasma treatment of the composite bandages. Plasma pre-treatment of the gauze fabric prior to nanofiber deposition and post-treatment to the composite bandages significantly reduced degradation of the nanofiber layer during repetitive flexing. Air permeability and moisture vapor transport were significantly reduced due to the presence of a nanofiber layer upon the substrate. The results of surface elemental analysis showed that the adhesion and durability increase are mainly due to the active species generated by plasma on the surface of cotton substrate as well as on the surface of the silk fibroin nanofibers. © 2012 Binary Information Press & textile Bioengineering and Informatics Society.

关键词： Adhesion

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Processing and characterization of liquid crystalline copoly-(ethylene terephthalate-co-2(3)-chloro-1,4-phenyleneterephthalate)/polycarbonate blends

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fibers and polymers 2001年第3期2卷 129-134页

作者： Rhee, Do Mook Ha, Wan Shik Youk, Ji Ho Yoo, Dong Il Department of Textile Engineering Chonnam National University Puk-ku Kwangju 500-757 300 Yongbong-dong South Korea Samyang Group Central R and D Center Yusung-ku Taejeon 305-348 63-2 Hwaam-dong South Korea Department of Fiber and Polymer Science Seoul National University Kwanak-ku Seoul 151-742 Shinlim-dong South Korea Department of Chemistry University of Alabama at Birmingham Birmingham AL 35294-1240 United States

Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4- phenylene terephthalate) (50/50, mole/ mole) [PECPT] was synthesized and blended with polycarbonate (PC). LC properties of PECPT and thermal, morphological, and rheological behaviors of the PECPT/PC blend were studied. PECPT showed the nematic LC phase and much longer relaxation time than poly(ethylene terephthalate) (PET). The apparent melt viscosity of PECPT was one third of that of PET. An, abrupt torque change was observed during the blending process due to the orientation of LC domains. For the blends containing 10-30 wt% of PECPT, the complex viscosities were higher than that of PC. As PECPT content increases above 40 wt%, shear thinning was observed. The lowest complex viscosity was obtained at 40-50 wt%. Transesterification of PECPT and PC was confirmed by the selective chemical degradation of carbonate groups in PC.

关键词： Blend Morphology PC PECPT Rheological property Transesterification

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Processing of natural fibers nanocomposites using ionic liquids

Processing of natural fibers nanocomposites using ionic liqu...

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Molten Salts and Ionic Liquids 16 - 214th ECS Meeting

作者： Rahatekar, Sameer S. Rasheed, Asif Jain, Rahul Zammarano, Mauro Koziol, Krzysztof K. Windle, Alan H. Kumar, Satish Gilman, Jeffery W. Building and Fire Research Division National Institute of Standards and Technology Gaithersburg MD 20899 United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 United States University of Cambridge Materials Science and Metallurgy Cambridge CB2 3QZ United Kingdom US Food and Drug Administration Center for Veterinary Medicine 7500 Standish Place Rockville MD 20855 United States

ISBN: (纸本)9781615676422

Multiwall Carbon nanotubes (MWNTs)/cellulose composite fibers were prepared using solution spinning with cellulose dissolved in 1-ethyl-3-methyl imidazolium acetate (EMI-Ac). MWNTs in different concentrations were used to make cellulose/MWNT composite solutions in EMI-Ac. MWNT form above 0.0007 mass fraction form a network. Scanning electron microscopy images of cellulose fibers show very high alignment of MWNTs in the fiber axis direction. Moderate improvement (30 %) in the tensile strength of MWNT/cellulose composite fibers was observed by adding up to 0.07 mass fraction MWNTs as compared to neat cellulose fibers. ©The Electrochemical Society.

关键词： Cellulose

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Processing of natural fibers nanocomposites using ionic liquids

Processing of natural fibers nanocomposites using ionic liqu...

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SAMPE '09 Spring Symposium Conference Proceedings

作者： Rahatekar, Sameer S Rasheed, Asif Jain, Rahul Zammarano, Mauro Koziol, Krzysztof K. Windle, Alan H. Kumar, Satish Gilman, Jeffery W. Building and Fire Research Division National Institute of Standards and Technology Gaithersburg MD 20899 United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 United States University of Cambridge Materials Science and Metallurgy Cambridge CB2 3QZ United Kingdom US Food and Drug Administration Center for Veterinary Medicine 7500 Standish Place Rockville MD 20855 United States

ISBN: (纸本)9781934551059

Multiwall Carbon nanotubes (MWNTs)/cellulose composite fibers were prepared using solution spinning with cellulose dissolved in ethyl-methyl imidazolium acetate (EMI-acetate). MWNTs in different concentrations were used to make cellulose/MWNT composite solutions in ethylmethyl imidazoluim acetate (EMI-acetate). MWNT form above 0.0007 mass fraction form a network. Scanning electron microscopy images of cellulose fibers show very high alignment of MWNTs in the fiber axis direction. Moderate improvement (30%) in the tensile strength of MWNT/cellulose composite fibers was observed by adding up to 0.07 mass fraction MWNTs as compared to neat cellulose fibers.

关键词： Cellulose

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Bicomponent vascular grafts consisting of synthetic absorbable fibers: Part II: In vivo healing response

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Journal of Investigative Surgery 1994年第3期7卷 195-211页

作者： Yu, Tarng-Jenn Ho, Donald M. Chu, C.C. Section of Cardiovascular Surgery Department of Surgery Veterans General Hospitals-Taipei Institute of Biomedical Engineering Yang-Ming Medical College Shih-Pai Taipei Taiwan Department of Pathology Veterans General Hospitals-Taipei Shih-Pai Taipei Taiwan Department of Textiles and Apparel Cornell University Ithaca NY United States Fiber and Polymer Science Program Department of Textiles and Apparel Cornell University Ithaca NY 14853-4401 United States

The objectives of this research were (I) to determine whether the use of partially absorbable vascular grafts would improve their nonthrombogenic performance and whether they are more prone to aneurysmal dilation and subsequent failure in vivo. and (2) to find out the relationships, if any. between these in vivo and the previously reported in vitro data with an emphasis on how the in vitro changes in fabric structure and properties related to these in vivo data. Bicomponent vascular fabrics were made from Dacron and polyglycolic acid (PGA) yarns with a range of composition ratios of the PGA to Dacron. Both woven and single Jersey knit fabrics were made, and implanted in dogs for 4 months. The following findings and relationships were obtained. (1) The bicomponent vascular fabrics resulted in a full-wall healing in the thoracic aorta of dogs. All bicomponent vascular grafts in survived dogs exhibited 100% patency, no thrombus or aneurysmal formation, no hematoma or seroma around the grafts, and no fibrin coagula in the inner capsules. The gross morphology of the regenerated tissues was very similar visually to the adjacent original arterial tissue. Histologically, the luminal surface was lined with a layer of endothelial cells with myofibroblasts, fibroblasts. and collagens underneath. (2) The extent of the full-wall healing depended on the type of fabric structure. the concentration of absorbable yarns, the location of absorbable yarns (for the woven group only), and initial water permeability. It is believed that the concentration effect was related to the level of macrophage activation from the degradation products of the absorbable yarns, while the location effect was attributed to the various types of fabric structure change on the degradation of the absorbable yarns. (3) In general, the knitted group (K), was better than the woven group (W). K3 showed the best in vivo performance in the knitted group. (4) In the woven group, W3 was the best. The incorporation o

关键词： Absorbable fibers Animal implantation Biodegradation Endothelial cell lining Synthetic vascular grafts Tissue ingrowth

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