Polyimide fibers prepared by a dry-spinning process: Enhanced mechanical properties of fibers containing biphenyl units

2016 ◽  
Vol 133 (31) ◽  
Author(s):  
Shihua Wang ◽  
Jie Dong ◽  
Zhentao Li ◽  
Yuan Xu ◽  
Wenjun Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyimide Fibers ◽  
Dry Spinning ◽  
Spinning Process

Polyimide fibers prepared by dry-spinning process: imidization degree and mechanical properties

2013 ◽  
Vol 48 (22) ◽  
pp. 7863-7868 ◽  
Author(s):  
Yuan Xu ◽  
Shihua Wang ◽  
Zhentao Li ◽  
Qian Xu ◽  
Qinghua Zhang
Keyword(s):  
Mechanical Properties ◽  
Polyimide Fibers ◽  
Dry Spinning ◽  
Spinning Process

Simulation of dry-spinning process of polyimide fibers

2009 ◽  
Vol 113 (5) ◽  
pp. 3059-3067 ◽  
Author(s):  
Gang Deng ◽  
Qingming Xia ◽  
Yuan Xu ◽  
Qinghua Zhang
Keyword(s):  
Polyimide Fibers ◽  
Dry Spinning ◽  
Spinning Process

scholarly journals Cribellate thread production as model for spider’s spinneret kinematics

2021 ◽  
Author(s):  
Margret Weissbach ◽  
Marius Neugebauer ◽  
Anna-Christin Joel
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Fibre Type ◽  
Material Science ◽  
Spider Silk ◽  
Functional Unit ◽  
Material Strength ◽  
Spinning Process ◽  
Fibre Spinning ◽  
House Spider

AbstractSpider silk attracts researchers from the most diverse fields, such as material science or medicine. However, still little is known about silk aside from its molecular structure and material strength. Spiders produce many different silks and even join several silk types to one functional unit. In cribellate spiders, a complex multi-fibre system with up to six different silks affects the adherence to the prey. The assembly of these cribellate capture threads influences the mechanical properties as each fibre type absorbs forces specifically. For the interplay of fibres, spinnerets have to move spatially and come into contact with each other at specific points in time. However, spinneret kinematics are not well described though highly sophisticated movements are performed which are in no way inferior to the movements of other flexible appendages. We describe here the kinematics for the spinnerets involved in the cribellate spinning process of the grey house spider, Badumna longinqua, as an example of spinneret kinematics in general. With this information, we set a basis for understanding spinneret kinematics in other spinning processes of spiders and additionally provide inspiration for biomimetic multiple fibre spinning.

PLA/Carbon Nanotubes Multifilament Yarns for Relative Humidity Textile Sensor

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Eric Devaux ◽  
Carole Aubry ◽  
Christine Campagne ◽  
Maryline Rochery
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Relative Humidity ◽  
Melt Spinning ◽  
Flexible Sensor ◽  
Spinning Process ◽  
Textile Sensor ◽  
Multifilament Yarns

Polylactide (PLA) was mixed with 4 wt.% of carbon nanotubes (CNTs) to produce electrical conductive multifilament yarns by melt spinning process for humidity detection. Thanks to a variation of electrical conductivity, this flexible sensor could detect the moisture presence. The introduction of plasticizer was necessary to ensure higher fluidity and drawability of the blend during the spinning process. The plasticizer modifies the crystallinity and the mechanical properties of the yarns. The effectiveness of this sensor (PLA/4 wt.% CNTs fibres) sensitive to humidity, is optimal when the spinning conditions are adapted. In this way, the temperature and the rate of the drawing roll were reduced. The influence of these parameters on the crystallinity, the mechanical properties and the sensitivity of the yarns were studied. Once the appropriate spinning conditions found, one humidity sensitive yarn was processed and the repeatability and efficient reversibility of its sensitivity were highlighted.

Spinning Process and Mechanical Properties Analysis of PTT Filament Core Spun Yarn

2011 ◽  
Vol 239-242 ◽  
pp. 1207-1210
Author(s):  
Yuan Xue ◽  
En Long Yang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Elastic Recovery ◽  
Staple Fiber ◽  
Ring Spinning ◽  
The Core ◽  
Outer Sheath ◽  
Spun Yarn ◽  
Two Component ◽  
Spinning Process

The two component filament/staple fiber core-spun yarn is spun on FA506 ring spinning frame with PTT filament as interlaced yarn and Tencel staple fiber as outer sheath. The spinning process and process parameters were analyzed. The morphology, mechanical property and wear-resisting property of two component core-spun yarn were tested. Results indicate that elastic recovery rate of core-spun is up to 90.6%; broken strength is up to 20 cN/tex after boiling water treatment. The core-spun yarn can be used as a new kind of knitting yarn for sweater.

Poly(ethylene terephthalate)/poly(ethylene-co-vinyl alcohol) sheath-core fibers: preparation and characterization

2015 ◽  
Vol 35 (8) ◽  
pp. 785-791 ◽  
Author(s):  
Shufeng Li ◽  
Rui Wang
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Ethylene Terephthalate ◽  
Moisture Absorption ◽  
Composite Fiber ◽  
Processing Temperature ◽  
Composite Fibers ◽  
Poly Ethylene Terephthalate ◽  
Spinning Process ◽  
Poly Ethylene

Abstract A novel sheath-core poly(ethylene terephthalate) (PET)/poly(ethylene-co-vinyl alcohol) (EVOH) composite fiber was designed and manufactured to improve the hydrophilicity of the PET fibers. The thermal stability of EVOH was first examined to determine the possible processing temperature. Second, the rheological characteristics of EVOH were measured to obtain the appropriate spinning parameters. Then, PET/EVOH composite fibers with various sheath-core ratios were manufactured and the effect of sheath-core ratio on the stable spinning process was investigated. Scanning electron microscopy (SEM) shows that the PET/EVOH fibers possess a round sheath-core cross-section and a smooth surface, indicating successful spinning. Finally, the mechanical properties and moisture absorption of the PET/ EVOH composite fibers were measured. For PET/EVOH composite fibers, the PET content contributes to the mechanical properties and the EVOH content contributes to the moisture absorption. For the PET/EVOH composite fibers with a sheath-core ratio of 50:50, the moisture regains at room conditions reach to 2.8% and the breaking strength is 2.53 cN/dtex. These good mechanical and moisture properties attract good application prospects.

scholarly journals On the cross-section of shaped fibers in the dry spinning process: Physical explanation by the geometric potential theory

2019 ◽  
Vol 14 ◽  
pp. 102347 ◽  
Author(s):  
Zhanping Yang ◽  
Feng Dou ◽  
Tao Yu ◽  
Minfeng Song ◽  
Haoxuan Shi ◽  
...  
Keyword(s):  
Potential Theory ◽  
Cross Section ◽  
Physical Explanation ◽  
Dry Spinning ◽  
Spinning Process ◽  
The Cross ◽  
Shaped Fibers

Analysis of Process and Properties of Stainless Steel Filament Wrapped Yarn Based on Multi-Axial Ring Spinning

2011 ◽  
Vol 332-334 ◽  
pp. 743-746
Author(s):  
Cheng Liang Deng ◽  
Zhao Qun Du ◽  
Wei Dong Yu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Process Optimization ◽  
Steel Wire ◽  
Ring Spinning ◽  
Excellent Performance ◽  
The Core ◽  
Axial Ring ◽  
Spinning Process ◽  
Core Yarn

A new spinning method was presented to spin three-axial stainless steel filament wrapped yarn by modified ring-spinning, where the stainless steel filament was set as the core yarn and the nylon filament for decoration wrapping the stainless steel filament in the fields of the fabric for Shielding application. A set of process parameters was obtained by the ring spinning frame improvement and spinning process optimization, which realized to spin nylon filament wrapped stainless steel filament yarn. Moreover, the structure, and tensile mechanical properties were measured on the wrapped yarns. The results show that the process can spin stainless steel wire wrapped yarn and acquire the excellent performance of the yarn.

Electrical and mechanical properties of polyaniline fibres produced by a one-step wet spinning process

Polymer ◽  
2000 ◽  
Vol 41 (6) ◽  
pp. 2265-2269 ◽  
Author(s):  
S.J Pomfret ◽  
P.N Adams ◽  
N.P Comfort ◽  
A.P Monkman
Keyword(s):  
Mechanical Properties ◽  
Wet Spinning ◽  
Spinning Process ◽  
One Step

Nonlinear vibration mechanism for fabrication of crimped nanofibers with bubble electrospinning and stuffer box crimping method

2016 ◽  
Vol 87 (14) ◽  
pp. 1706-1710 ◽  
Author(s):  
Ping Wang ◽  
Peng Liu ◽  
Hai-Yan Kong ◽  
Yan Zhang ◽  
Ji-Huan He
Keyword(s):  
Mechanical Properties ◽  
Finite Deformation ◽  
Transverse Vibration ◽  
Analytical Study ◽  
Viscoelastic Beam ◽  
Governing Equations ◽  
Spinning Process ◽  
Vibration Mechanism ◽  
Axially Moving ◽  
Nonlinear Transverse Vibration

This paper aims to produce nanoscale crimped fibers using stuffer box crimping and bubble electrospinning. Nanofibers are originally obtained via a ruptured bubble and then crimped with the stuffer box crimping method. During this spinning process, the governing equations for nonlinear transverse vibration of an axially moving viscoelastic beam with finite deformation are established using the Hamiltonian principle. The crimp frequency is affected by many factors, including spinning conditions and mechanical properties of fibers. The obtained governing equations can be further used for numerical or analytical study of the crimping mechanism.

Sign in / Sign up

Export Citation Format

Share Document