Effect of Carbon Nanoparticles on Properties of Polyetherimide Fibers

2021 ◽  
Vol 899 ◽  
pp. 381-386
Author(s):  
Gleb Vaganov ◽  
Elena Ivan’kova ◽  
Vladimir Yudin ◽  
Vyacheslav Vaganov
Keyword(s):  
Mechanical Characteristics ◽  
Polymer Fibers ◽  
Single Wall Carbon Nanotubes ◽  
Fiber Volume ◽  
Sem Study ◽  
Nanocomposite Fibers ◽  
Polyimide Fiber ◽  
Carbon Nanofillers ◽  
Mechanical Tensile ◽  
Polyimide Nanocomposite

In the present work, fibers based on heat-resistant amorphous polyimide brand Ultem-1000 were prepared by melt extrusion. Vapor-grown carbon nanofibers (VGCFs) and single-wall carbon nanotubes (SWCNTs) were used to increase the mechanical characteristics of the polymer fibers. The fibers were characterized by scanning electron microscopy (SEM), thermophysical and mechanical tensile analysis. SEM study revealed very good distribution of the carbon nanofillers throughout the polyimide fiber volume. The mechanical testing of the unoriented nanocomposite fibers showed that the introduction of VGCFs or SWCNTs led to an increase in tensile strength and modulus. High-temperature drawing allows obtaining polyimide nanocomposite fibers with significantly increased mechanical properties (»300 MPa for strength and »4.6 GPa for modulus).

scholarly journals Structure and mechanical properties of A356-C alloys

2018 ◽  
Vol 243 ◽  
pp. 00024
Author(s):  
Marina Khmeleva ◽  
Anton Khrustalev ◽  
Alexander Vorozhtsov
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Mechanical Characteristics ◽  
Casting Alloy ◽  
A356 Aluminum Alloy ◽  
Mechanical Mixing ◽  
Alloy Structure ◽  
Melt Treatment ◽  
Mechanical Tensile ◽  
A356 Aluminum

The paper deals with influence of mechanical mixing and vibration treatment on the structure and mechanical characteristics of the aluminum alloy containing ≤ 1 wt.% of nanodiamonds (A356-C). The alloy was obtained from industrial A356 Al-Si casting alloy by means of an integrated effect of mechanical mixing and vibration. It has been shown that the introduction of nanodiamond particles contributes to improving the alloy structure and increasing its mechanical tensile properties. The structure of the A356 aluminum alloy has been refined with introduction of 0.2 wt% nanodiamonds and application of vibration melt treatment. The introduction of nanodiamonds into the melt and the vibration melt treatment enable one to increase the yield strength and tensile strength of the A356 aluminum alloy without any change in ductility.

Electrospun Polyimide Nanocomposite Fibers Reinforced with Core−Shell Fe-FeO Nanoparticles

2010 ◽  
Vol 114 (19) ◽  
pp. 8844-8850 ◽  
Author(s):  
Jiahua Zhu ◽  
Suying Wei ◽  
Xuelong Chen ◽  
Amar B. Karki ◽  
Dan Rutman ◽  
...  
Keyword(s):  
Core Shell ◽  
Nanocomposite Fibers ◽  
Polyimide Nanocomposite ◽  
Feo Nanoparticles

scholarly journals Influence of SiC/Si3N4 Hybrid Nanoparticles on Polymer Tensile Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Vijaya K. Rangari ◽  
M. Yousuf ◽  
Shaik Jeelani
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Nylon 6 ◽  
Polymer Fibers ◽  
Hybrid Nanoparticles ◽  
Sonochemical Method ◽  
Neat Polymer ◽  
Sic Nanoparticles ◽  
Nanocomposite Polymer ◽  
Nanocomposite Fibers

Nanostructured silicon carbide (SiC)/silicon nitride (Si3N4) hybrid nanoparticles exhibit a high-potential for reinforcement of polymers. In the present investigation, silicon carbide (β-SiC) nanoparticles (~30 nm) were sonochemically coated on acicular silicon nitride (~100 nm × 800 nm) particles to increase the thermal and mechanical properties of Nylon-6 nanocomposite fibers. To produce Nylon-6/(SiC/Si3N4) nanocomposite fibers, we have followed a two-step process. In the first step, SiC nanoparticles were coated on Si3N4 nanorods using a sonochemical method and Cetyltrimethylammonium Bromide surfactant. In the second step, the SiC coated Si3N4 hybrid nanoparticles were blended with Nylon-6 polymer and extruded in the form of nanocomposite polymer fibers. The nanocomposite fibers were uniformly stretched and stabilized using a two-set Godet roll machine. The diameters of the extruded neat Nylon-6 and SiC/Si3N4/Nylon-6 nanocomposite fibers were measured using a scanning electron microscope and then tested for their tensile and thermal properties. These results were compared with the neat Nylon-6 polymer fibers. These results clearly indicate that the as-prepared nanocomposite polymer fibers are much higher in tensile strength (242%) and Young’s modulus (716%) as compared to the neat polymer fibers.

scholarly journals AC Conductivity Studies on PMMA-PANI (HCl) Nanocomposite Fibers Produced by Electrospinning

2011 ◽  
Vol 6 (4) ◽  
pp. 155892501100600 ◽  
Author(s):  
Veluru Jagadeesh Babu ◽  
V. S. Pavan Kumar ◽  
G.J. Subha ◽  
Vasantha Kumari ◽  
T.S. Natarajan ◽  
...  
Keyword(s):  
Ac Conductivity ◽  
Room Temperature ◽  
Polymer Fibers ◽  
Complex Conductivity ◽  
Scanning Electron Micrographs ◽  
Fiber Mats ◽  
Conducting Composite ◽  
Electrically Conducting ◽  
Nanocomposite Fibers ◽  
Insulating Polymers

Electrospinning is one of the techniques to produce non-woven fiber mats using polymers. The diameters of the fiber produced by this technique are in the range of 10 ^m to 10 nm. Electrically conducting ultra fine fibers are useful in many applications in the fields of sensors, and nanoelectronics. However, it is very difficult to obtain fibers of conducting polymers like polyaniline (PANI) and polypyrrole through electrospinning. Hence they are invariably mixed with other insulating polymers such as polymethylmethacrylate (PMMA) to obtain a conducting composite depending on the percolation of the conducting polymer. Here, we report the preparation of PANI-PMMA composite fibers by electrospinning. The scanning electron micrographs and the frequency dependent complex conductivity (σ*(ω)) of these polymer fibers are investigated at room temperature with different concentrations of PANI (5%, 10%, 15%, 20% w/w). It is observed that there is a significant enhancement in the ac conductivity of these fibers with the increase in the concentration of PANI.

scholarly journals Synthesis and Characterizations of a Collagen-Rich Biomembrane with Potential for Tissue-Guided Regeneration

2019 ◽  
Vol 13 (03) ◽  
pp. 295-302 ◽  
Author(s):  
Marcos J. Silva ◽  
Carolina P. Gonçalves ◽  
Kleber M. Galvão ◽  
Paulo H. P. D’Alpino ◽  
Fábio D. Nascimento
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Guided Bone Regeneration ◽  
Commercial Products ◽  
Physical Chemical ◽  
Strength And Deformation ◽  
Mechanical Tensile ◽  
Intestinal Submucosa ◽  
Deformation Tests ◽  
Better Than

Abstract Objectives In this study, a collagen-rich biomembrane obtained from porcine ­intestinal submucosa for application in guided bone regeneration was developed and characterized. Then, its biological and mechanical properties were compared with that of commercial products (GenDerm [Baumer], Lumina-Coat [Critéria], Surgitime PTFE [Bionnovation], and Surgidry Dental F [Technodry]). Materials and Methods The biomembrane was extracted from porcine intestinal submucosa. Scanning electron microscopy, spectroscopic dispersive energy, glycosaminoglycan quantification, and confocal microscopy by intrinsic fluorescence were used to evaluate the collagen structural patterns of the biomembrane. Mechanical tensile and deformation tests were also performed. Statistical Analysis  The results of the methods used for experimental membrane characterizations were compared with that obtained by the commercial membranes and statistically analyzed (significance of 5%). Results The collagen-rich biomembrane developed also exhibited a more organized, less porous collagen fibril network, with the presence of glycosaminoglycans. The experimental biomembrane exhibited mechanical properties, tensile strength, and deformation behavior with improved average stress/strain when compared with other commercial membranes tested. Benefits also include a structured, flexible, and ­bioresorbable characteristics scaffold. Conclusions The experimental collagen-rich membrane developed presents physical–chemical, molecular, and mechanical characteristics similar to or better than that of the commercial products tested, possibly allowing it to actively participating in the process of bone neoformation.

Melt processing of SWCNT-polyimide nanocomposite fibers

2004 ◽  
Vol 35 (5) ◽  
pp. 439-446 ◽  
Author(s):  
Emilie J Siochi ◽  
Dennis C Working ◽  
Cheol Park ◽  
Peter T Lillehei ◽  
Jason H Rouse ◽  
...  
Keyword(s):  
Melt Processing ◽  
Nanocomposite Fibers ◽  
Polyimide Nanocomposite

Effect of Contraceptive Steroids on the Endometrium of Guinea Pig: SEM study

1977 ◽  
Vol 35 ◽  
pp. 668-669
Author(s):  
Mai M. Said ◽  
Ramesh K. Nayak ◽  
Randall E. McCoy
Keyword(s):  
Guinea Pig ◽  
Reproductive Tract ◽  
Three Dimensional ◽  
Female Reproductive Tract ◽  
Human Female ◽  
Surface Ultrastructure ◽  
Transmission Electron ◽  
Sem Study ◽  
Uterine Mucosa ◽  
Group 1

Burgos and Wislocki described changes in the mucosa of the guinea pig uterus, cervix and vagina during the estrous cycle investigated by transmission electron microscopy. More recently, Moghissi and Reame reported the effects of progestational agents on the human female reproductive tract. They found drooping and shortening of cilia in norgestrel and norethindrone- treated endometria. To the best of our knowledge, no studies concerning the effects of mestranol and norethindrone given concurrently on the three-dimensional surface features on the uterine mucosa of the guinea pig have been reported. The purpose of this study was to determine the effect of mestranol and norethindrone on surface ultrastructure of guinea pig uterus by SEM.Seventy eight animals were used in this study. They were allocated into two groups. Group 1 (20 animals) was injected intramuscularly 0.1 ml vegetable oil and served as controls.

Sign in / Sign up

Export Citation Format

Share Document