scholarly journals Fabrication of Ultrafine PPS Fibers with High Strength and Tenacity via Melt Electrospinning

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 530 ◽  
Author(s):  
Zuo-Ze Fan ◽  
Hong-Wei He ◽  
Xu Yan ◽  
Ren-Hai Zhao ◽  
Yun-Ze Long ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Crystallization Peak ◽  
Elongation At Break ◽  
Ultrafine Fibers ◽  
Melt Electrospinning ◽  
High Performance Resin ◽  
Uniform Diameter

Electrospinning (e-spinning) is an emerging technique to prepare ultrafine fibers. Polyphenylene sulfide (PPS) is a high-performance resin which does not dissolve in any solvent at room temperature. Commercial PPS fibers are produced mainly by meltblown or spunbonded process to give fibers ~20 μm in diameter. In this research, an in-house designed melt electrospinning device was used to fabricate ultrafine PPS fibers, and the e-spinning operation conducted under inert gas to keep PPS fibers from oxidizing. Under the optimum e-spinning conditions (3 mm of nozzle diameter, 30 kV of electrostatic voltage, and 9.5 cm of tip-to-collector distance), the as-spun fibers were less than 8.0 μm in diameter. After characterization, the resultant PPS fibers showed uniform diameter and structural stability. Compared with commercial PPS staple fibers, the obtained fibers had a cold crystallization peak and 10 times higher storage modulus, thereby offering better tensile tenacity and more than 400% elongation at break.

Star-shaped arylacetylene resins derived from silicon

2020 ◽  
Vol 40 (8) ◽  
pp. 676-684
Author(s):  
Niping Dai ◽  
Junkun Tang ◽  
Manping Ma ◽  
Xiaotian Liu ◽  
Chuan Li ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Mechanical Test ◽  
Flexural Modulus ◽  
Mechanical Analysis ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Structures And Properties ◽  
High Performance Resin

AbstractStar-shaped arylacetylene resins, tris(3-ethynyl-phenylethynyl)methylsilane, tris(3-ethynyl-phenylethynyl) phenylsilane, and tris (3-ethynyl-phenylethynyl) silane (TEPHS), were synthesized through Grignard reaction between 1,3-diethynylbenzene and three types of trichlorinated silanes. The chemical structures and properties of the resins were characterized by means of nuclear magnetic resonance, fourier-transform infrared spectroscopy, Haake torque rheomoter, differential scanning calorimetry, dynamic mechanical analysis, mechanical test, and thermogravimetric analysis. The results show that the melt viscosity at 120 °C is lower than 150 mPa⋅s, and the processing windows are as wide as 60 °C for the resins. The resins cure at the temperature as low as 150 °C. The good processabilities make the resins to be suitable for resin transfer molding. The cured resins exhibit high flexural modulus and excellent heat-resistance. The flexural modulus of the cured TEPHS at room temperature arrives at as high as 10.9 GPa. Its temperature of 5% weight loss (Td5) is up to 697 °C in nitrogen. The resins show the potential for application in fiber-reinforced composites as high-performance resin in the field of aviation and aerospace.

Composite Materials Manufacturing Processes

2011 ◽  
Vol 110-116 ◽  
pp. 1361-1367 ◽  
Author(s):  
Mohammad Reza Khosravani
Keyword(s):  
Composite Materials ◽  
High Performance ◽  
Fiber Composite ◽  
High Strength ◽  
Commercial Aircraft ◽  
Carbon Fiber Composite ◽  
Advanced Composites ◽  
Space Reduction ◽  
High Performance Resin ◽  
Vehicle Components

— Using Composite materials are growing more and more today and we have to use them in possible situation. One of the Composite materials applications is on the Airplane and aero space. Reduction of Airplane weight and more adaptability with nature are examples of benefit of using composite materials in aerospace industries. In this article process of manufacturing of composite materials and specially carbon fiber composite are explained. Advance composite materials are common today and are characterized by the use of expensive, high-performance resin systems and high-strength, high-stiffness fiber reinforcement. The aerospace industry, including military and commercial aircraft of all types, is the major customer for advanced composites. Product range now includes materials for low pressure and low temperature. Some using composite materials in aero space are as follow: Satellite Components, Thin Walled Tubing for Aircraft and Satellites, launch vehicle components and honeycomb structures.

High Performance, Light weight Thermoplastic/Rare Earth Alloy Magnets

1999 ◽  
Vol 577 ◽  
Author(s):  
Jun Xiao ◽  
Joshua U. Otaigbe
Keyword(s):  
Rare Earth ◽  
High Performance ◽  
Mechanical Performance ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Exploratory Research ◽  
Rare Earth Alloy ◽  
Crystal Polymer ◽  
High Performance Polymer

ABSTRACTWe report progress on our exploratory research on surface modification of magnetic NdFeB fillers, characterization of suitable magnetic rare earth alloy powders and high-performance polymer matrices, processability, and properties of novel thermoplastic/NdFeB magnets. The results suggest that blending liquid crystal polymer (LCP) with a high-thermoplastic polymer such as polyphenylene sulfide (PPS) provides the required balance of properties. These properties include superior magneto-mechanical performance, minimal melt viscosity at optimal NdFeB volume loading, enhanced thermal stability, high stiffness, high strength, improved dimensional stability, and excellent chemical resistance; making the thermoplastics magnets suitable for use in high temperature and aggressive environments where commercial polymer-bonded magnets are not useable.

An electron diffraction study of the wholly aromatic copolyester Xydar

1989 ◽  
Vol 47 ◽  
pp. 340-341
Author(s):  
L. S. Li ◽  
P. H. Geil
Keyword(s):  
High Temperature ◽  
Electron Diffraction ◽  
High Performance ◽  
Room Temperature ◽  
Diffuse Reflection ◽  
Three Dimensional ◽  
Electron Diffraction Study ◽  
Molar Ratio ◽  
Temperature Structure ◽  
High Performance Resin

It was shown by electron diffraction that p-hydroxybenzoate/m-hydroxybenzoate copolymer (95/5) possesses a three dimensional order with two orthorhombic crystalline modifications coexisting at room temperature. During heating the orthorhombic modifications I and II transform to hexagonal lateral packing of the chains at 290°C and 350°C respectively. The electron diffraction pattern obtained at 350°C can be indexed by a hexagonal unit cell with parameters a = b = 10.74Å, c = 12.34Å, γ = 120°. The observed d-spacings of the reflections and indices are listed in Table I. When the sample was heated to 430°C - 470°C only one broad and diffuse reflection was observed on the equator, while the meridional reflections are still sharp. In order to find out if the high temperature structure of the p- and m-hydroxybenzoate copolymer (95/5) is a general feature for other wholly aromatic copolyesters we have studied a high temperature and high performance resin Xydar SRT 300, which is made from a 1:2:1 molar ratio of following monomers: p, p'-biphenol, p-hydroxybenzoic acid and terephthalic acid.

Layered Cellulose Nanofibers Nanocomposites via Layer by Layer Assembling

2012 ◽  
Vol 530 ◽  
pp. 56-61 ◽  
Author(s):  
Shen Yuan Fu ◽  
Pin Gan Song ◽  
Zhong Jin Ni ◽  
Qiang Wu
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Cellulose Nanofibers ◽  
High Strength ◽  
Amorphous Structure ◽  
Layer By Layer ◽  
Paper Pulp ◽  
Elongation At Break ◽  
Transmission Electron ◽  
Flexural Tests

Native cellulose nanofibers with high strength ratio may create an alternative as the blade material for wind power field. In this work, cellulose nanofibers (CN) with high L/D ratio was fabricated by combined biological treatment and mechanical disintegration processes. Then, we created a high-performance cellulose layered nanocomposites via layer by layer (LBL) assembling strategy. Transmission electron microscopy (TEM) observations show that common paper pulp exhibits a nearly spherical or amorphous structure, while as-made cellulose nanofibers displays a high aspect ratio, with a length of ca. 10~100 μm and a diameter of ca. 30~100 nm. However, some relative big fibres bundles are still observed. Mechanical measurements demonstrate that the tensile strength, Young’s modulus and elongation at break of layered CN nanocomposites (CNLC) reach 114MPa. 7.0GPa and 68 %,respectively, while only 63MPa, 3.3 GPa and 27 % for layered common paper pulp composites (PFLC). Flexural tests results show that CNLC gives a flexural strength and modulus of 263 MPa and 19 GPa, while only 114 MPa and 11 GPa for PFLC. Fracture surface observations indicate that though layered structure can be observed for both PFLC and CNLC, much thinner layer and long fibrous structure only exist in CNLC, which results in high mechanical performance.

The Preparation of Polypropylene/Polyvinyl Alcohol Ultra-Fine Fibers Using Melt Electrospinning Method

2013 ◽  
Vol 561 ◽  
pp. 8-12 ◽  
Author(s):  
Hao Yi Li ◽  
Yu Mei Ding ◽  
Yong Liu ◽  
You Chen Zhang ◽  
Wei Min Yang
Keyword(s):  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Polyphenylene Sulfide ◽  
Melt Viscosity ◽  
Paper Production ◽  
Degradable Polymer ◽  
Melt Electrospinning ◽  
Electrospinning Method ◽  
Cloth Production ◽  
Water Absorbability

Some polymers like polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS) are very hard to be solute in conventional solvents at room temperature, and impossible to be solution electrospun, but they can be easily fabricated into ultra-fine fibers using melt electrospinning. In this study, PP/PVA compound ultra-fine fibers were produced using mlet electrospinning. The effect of PVA content in PP/PVA compound on the properities of resultant fibers was studied. Different plasticizers were added into the compound to find the most effective plasticizer reducing the melt viscosity. It was shown that PP/PVA compound with content of 5% PVA can produce the finest fiber while adding 8% hyper-branched polyester (HBP). In addition, the resultant fibers were made into thin paper using compaction processing, and water absorbability was tested. The results were expected to be used in dyeable PP cloth production and degradable polymer paper production.

scholarly journals Ultrafine and High-Strength Silk Fibers Secreted by Bimolter Silkworms

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2537 ◽  
Author(s):  
Kaiyu Guo ◽  
Xiaolu Zhang ◽  
Zhaoming Dong ◽  
Yuhui Ni ◽  
Yuqing Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Strength ◽  
Silk Gland ◽  
X Ray Diffraction ◽  
Ultrafine Fibers ◽  
Silk Fibers ◽  
Warmth Retention ◽  
The Relationship ◽  
Β Sheet

Ultrafine fibers are widely employed because of their lightness, softness, and warmth retention. Although silkworm silk is one of the most applied natural silks, it is coarse and difficult to transform into ultrafine fibers. Thus, to obtain ultrafine high-performance silk fibers, we employed anti-juvenile hormones in this study to induce bimolter silkworms. We found that the bimolter cocoons were composed of densely packed thin fibers and small apertures, wherein the silk diameter was 54.9% less than that of trimolter silk. Further analysis revealed that the bimolter silk was cleaner and lighter than the control silk. In addition, it was stronger (739 MPa versus 497 MPa) and more stiffness (i.e., a higher Young’s modulus) than the trimolter silk. FTIR and X-ray diffraction results revealed that the excellent mechanical properties of bimolter silk can be attributed to the higher β-sheet content and crystallinity. Chitin staining of the anterior silk gland suggested that the lumen is narrower in bimolters, which may lead to the formation of greater numbers of β-sheet structures in the silk. Therefore, this study reveals the relationship between the structures and mechanical properties of bimolter silk and provides a valuable reference for producing high-strength and ultrafine silk fibers.

High Performance Optoelectronic Devices Based on Bright Perovskite Nanocrystals Synthesized at Room Temperature

2018 ◽  
Author(s):  
Sotirios Christodoulou ◽  
Francesco Di Stasio ◽  
Santanu Pradhan ◽  
Inigo Ramiro ◽  
Yu Bi ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Optoelectronic Devices ◽  
Perovskite Nanocrystals

BERYLCO 25

Alloy Digest ◽  
1973 ◽  
Vol 22 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
Beryllium Copper

Abstract BERYLCO 25 is the standard high-performance beryllium copper alloy most widely used because of its high strength, hardness and excellent spring characteristics. BERYLCO 25 is the updated version of BERYLCO 25S (Alloy Digest Cu-3, November 1952). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-271. Producer or source: Kawecki Berylco Industries Inc..

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