Development of Durable Softening and Water-Repellent PP/HDPE Heat-Bondable Composite Fiber

Spinning and finishing techniques of a durable softening and water-repellent PP/HDPE heat-bondable fiber were introduced. The fiber has a core-sheath structure. PP is the core and HDPE is the sheath. The core-sheath fiber structure and spinning materials properties make the fiber have a good heat-bonding performance. During the finishing process the fiber got a durable softening and water-repellent quality by the durable waterproofing agent—a mixture of PMHS and PDMS. Experiments show that the fibers begin to melt and bond each other at 127.5°C and could keep a good water-repellent performance after being washed five circles.

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Free Vibration Analysis of Symmetric Sandwich Beams

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.872.399 ◽

2017 ◽

Vol 872 ◽

pp. 399-404

Author(s):

Zakaria Ibnorachid ◽

Khalid El Bikri ◽

Lhoucine Boutahar

Keyword(s):

Sandwich Beam ◽

Free Vibration Analysis ◽

Core Layer ◽

Equation Of Motion ◽

Geometrical Parameters ◽

Symmetric Vibration ◽

Materials Properties ◽

The Core ◽

Validation Of Results ◽

Good Agreement

The aim of the present work is to study the linear free symmetric vibration of three-layer sandwich beam using the energy method. The zigzag model is used to describe the displacement field. The theoretical model is based on the top and bottom layers behave as Euler-Bernoulli beams while the core layer as a Timoshenko beam. Based on Hamilton’s principle, the governing equation of motion sandwich beam is obtained in order to calculate the linear frequency parameters. Two types of boundary conditions simple supported-simple-supported (SS-SS) and clamped-clamped (C-C) under the influence of materials properties and geometrical parameters are studied. The validation of results is done by comparing with another studies, which available in the literature and found good agreement between the studies.

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Research on performance of twin-core spun yarn and fabric

International Journal of Clothing Science and Technology ◽

10.1108/ijcst-12-2018-0162 ◽

2019 ◽

Vol 32 (3) ◽

pp. 338-355

Author(s):

Xuzhong Su ◽

Xinjin Liu

Keyword(s):

High Temperature ◽

Fiber Composite ◽

Woven Fabrics ◽

Numerical Control ◽

Content Type ◽

The Core ◽

Spun Yarn ◽

Finishing Process ◽

Spun Yarns ◽

Elastic Filament

Purpose As one kind of filament/staple fiber composite yarn, core spun yarn has been widely used, especially on Jeans. However, there is only one filament in the commonly used core spun yarn, such as spandex, and the performance of the one filament often is influenced during dyeing and finishing. Therefore, in the paper, twin-core spun yarns with two different filaments feeding simultaneously were spun on ring spinning frame modified by one kind of filament feeding numerical control device. The paper aims to discuss these issues. Design/methodology/approach Four kinds of twin-core spun yarns, cotton/spandex/PBT, cotton/spandex/CM800, cotton/spandex/T400, cotton/spandex/SPH with linear density 36.4tex/40D/50D were spun. For improving the covering effect of the two filaments, the filament feeding position, filament pre-drafting multiple, distance between two staple roving, designed twist factor of the core spun yarn were optimized. Findings It is shown that comparing with the core spun yarn, the breaking strength and elongation of the twin-core spun yarns are improved since the addition of another elastic filament, while the evenness is a little worse. Originality/value By using the twin-core spun yarns, corresponding knitted and woven fabrics are produced. Meanwhile, for simulating the dyeing and finishing process, the knitted fabrics were treated during the 150°C high temperature. It is shown that comparing with the fabrics produced by cotton/spandex yarn, addition of another elastic filament can improve the fabric strength and resistant and has positive effect on worsen prevention for high temperature treated fabric elastic recovery, and on change prevention during the dyeing and finishing process for fabric handle properties, and improves the fabric stability.

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Preparation and characterization of electro-responsive core-sheath fiber mats for smart materials

Textile Research Journal ◽

10.1177/0040517516646053 ◽

2016 ◽

Vol 87 (9) ◽

pp. 1142-1151 ◽

Cited By ~ 5

Author(s):

Se Young Oh ◽

Tae Jin Kang

Keyword(s):

Smart Materials ◽

Inorganic Materials ◽

Electrospinning Technique ◽

Fiber Mats ◽

The Core ◽

Potential Applications ◽

Multi Walled Carbon Nanotubes ◽

Er Fluids ◽

Core Part ◽

Sheath Structure

Multi-walled carbon nanotubes coated with inorganic materials were spun with polyethylene terephthalate with a core-sheath structure using co-axial electrospinning technique. The effect of electrorheological (ER) particle content on the morphology, rheological and mechanical properties has been studied. It has been shown that ER particles were homogeneously distributed throughout the core part of the fibers with the core-sheath structure. It has been uniformly fabricated by controlling the viscosity and conductivity of ER fluids as well as the applied voltage, feeding rate of the electrospinning systems. The tensile test results with fiber mats showed that the modulus and tensile strength of the fiber mats is enhanced with lower breaking elongation because of the instant increase of viscosity and yield stress of ER fluid in the core part under the external applied electric field. Fiber mats with ER fluids in the core of the fiber may find potential applications in the area of adaptive textile structures.

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Variational Quantum Monte Carlo Calculation of Materials Properties

MRS Proceedings ◽

10.1557/proc-141-3 ◽

1988 ◽

Vol 141 ◽

Author(s):

Steven G. Louie

Keyword(s):

Monte Carlo ◽

Ground State ◽

Quantum Monte Carlo ◽

Valence Electron ◽

Monte Carlo Calculation ◽

Core Region ◽

Materials Properties ◽

The Core ◽

Large Fluctuations ◽

Electron Wavefunction

AbstractA new method of calculating the total energy and other ground-state properties of solids which employs nonlocal pseudopotentials in conjunction with the variational quantum Monte Carlo approach is presented. Valence electron correlations are treated using the exact interaction with a correlated many-electron wavefunction of the Jastrow-Slater form. The use of pseudopotentials for the electron-ion interaction removes from the problem the large fluctuations of electron energies in the core region which occur in quantum Monte Carlo all-electron schemes. We discuss calculation of the cohesive energy and structural properties of diamond and graphite and the ionization energy and electron affinity of atoms using the present approach. The results are in excellent agreement with experiment.

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Electrospun Core-Shell Hollow Structure Cocatalysts for Enhanced Photocatalytic Activity

Journal of Nanomaterials ◽

10.1155/2021/9980810 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Fengyun Guo ◽

Ziyi Guo ◽

Lei Gao ◽

Dongming Qi ◽

Guichu Yue ◽

...

Keyword(s):

Photocatalytic Activity ◽

Hollow Structure ◽

Composite Fiber ◽

Core Shell ◽

Composite Fibers ◽

The Core ◽

Excellent Photocatalytic Activity ◽

Repeated Use ◽

Shell Composite ◽

High Temperature Calcination

The core-shell NaYF4/Yb/Tm/TiO2 hollow composite fibers were prepared by coaxial electrospinning and high-temperature calcination. The composite fibers exhibit excellent photocatalytic activity under the dual synergistic of regulating the core-shell hollow microstructure and the composition by doping nanoparticles. Compared with commercial P25 and hollow fiber without nanoparticles, the degradation efficiency of rhodamine B using the core-shell composite fiber was significantly improved up to 99%. Moreover, the nanoparticles in the composite fibers can exist stably and maintain good structure and photocatalytic activity after repeated use. Therefore, the composite fiber has a wide application prospect in photocatalytic degradation of organic pollutants.

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An Analytical Model for the High Temperature Low Sag Conductor Knee Point Determination

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.641.173 ◽

2015 ◽

Vol 641 ◽

pp. 173-180

Author(s):

Andrzej Mamala ◽

Tadeusz Knych ◽

Beata Smyrak ◽

Paweł Kwaśniewski ◽

Grzegorz Kiesiewicz ◽

...

Keyword(s):

High Temperature ◽

Rapid Change ◽

Overhead Line ◽

Materials Properties ◽

Overhead Lines ◽

The Core ◽

Operation Conditions ◽

Knee Point ◽

Point Determination ◽

Line Design

The modern high voltage power overhead lines operate with high temperature low sag (HTLS) conductors due to possibility of the current capacity increase. HTLS conductors are material and technological advanced solutions. The main advantage of HTLS conductors is a special designed operation conditions which cause the transformation of tensile stresses from the external aluminium base layers to the core. The conditions of this transformation are called “knee point” because a rapid change of the conductor sag - temperature relationship is observed. Prediction of conditions of the “knee point” temperature (KPT) is a key problem during overhead line design. The KPT is a function of different factors like conductor materials properties, conductor design, span parameters, sagging procedures and overhead line exploitation conditions. The paper presents an original theoretical model for HTLS conductors KPT calculations and shows some examples and comparisons of the different conductor designs and parameters.

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Effect of Water Repellent Treatment and Fiber Structure on Water Repellency

Seikei-Kakou ◽

10.4325/seikeikakou.32.237 ◽

2020 ◽

Vol 32 (7) ◽

pp. 237-240

Author(s):

Chika Kimura

Keyword(s):

Water Repellency ◽

Water Repellent ◽

Fiber Structure ◽

Effect Of Water

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The Formation and Destruction of the Boundary Layer in Polymer Composite Fiber Shells during Their Ageing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.482.295 ◽

2005 ◽

Vol 482 ◽

pp. 295-298

Author(s):

S.P. Senchurov ◽

Yu.F. Zabashta

Keyword(s):

Boundary Layer ◽

Stress State ◽

Shear Modulus ◽

Structural Relaxation ◽

Boundary Layer Thickness ◽

Composite Fiber ◽

Core Shell ◽

Relaxation Processes ◽

The Core ◽

Ageing Model

This paper considers the composite "core-shell" fibers ageing. A physical model of ageing is proposed. The stress state due to the structural relaxation processes in the shell results from the ageing. The ageing model was verified experimentally. The agreement between the model and experiment is found. A weak periodical boundary layer between the core and the shell is formed as a result of the composite fiber ageing process. The values characterizing the boundary layer (thickness and shear modulus) were obtained.

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Investigation of Differential Induced Attenuation of Orthogonal Axes in Polarization Maintaining Fibers

MRS Proceedings ◽

10.1557/proc-172-111 ◽

1989 ◽

Vol 172 ◽

Author(s):

M. E. Gingerich ◽

S. J. Hickey ◽

C. C. Harrington ◽

M. J. Marrone ◽

E. J. Friebele ◽

...

Keyword(s):

Steady State ◽

Ionizing Radiation ◽

Materials Properties ◽

The Core ◽

Permanent Loss ◽

Polarization Maintaining

AbstractRecent studies have indicated that the birefringent-inducing stress of polarization-maintaining (PM) fibers decreases the long term, permanent loss induced by ionizing radiation and that light polarized along the two orthogonal axes of PM fibers may be attenuated differently by exposure to irradiation sources. This paper reports the results of specific studies of this differential attenuation induced in a series of PM fibers by both steady state and transient irradiations. It has been found that the response to ionizing radiation depends on the materials properties of the fiber, i.e. the core and clad dopants and/or degree of stress, and that the magnitude of the differential attenuation is small relative to the total or one-axis incremental loss.

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