Enhanced toughness and gas permeabilities of polyimide composites derived from polyimide matrix and flower‐like polyimide microparticles

2021 ◽  
Author(s):  
Yao Wang ◽  
Yunhua Lu ◽  
Jianhua Zhang ◽  
Ying Liang ◽  
Haijun Chi ◽  
...  
Keyword(s):  
Polyimide Composites ◽  
Polyimide Matrix

The tribological properties of carbon fiber reinforced polyimide matrix composites under distilled water condition

2016 ◽  
Vol 68 (2) ◽  
pp. 212-219 ◽  
Author(s):  
Juan Wu ◽  
Ziming Kou ◽  
Gongjun Cui
Keyword(s):  
Carbon Fiber ◽  
Distilled Water ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Content Type ◽  
Wear Rates ◽  
Water Condition ◽  
Polyimide Composites ◽  
Carbon Fiber Reinforced ◽  
Polyimide Matrix

Purpose – The purpose of this paper is to prepare carbon fiber-reinforced polyimide matrix composites and to investigate the single role of carbon fiber in polyimide composites on tribological performance under distilled water condition. Design/methodology/approach – Three carbon fiber-reinforced polyimide matrix composites were fabricated by using a hot press molding technique. The tribological behaviors of carbon fiber-reinforced polyimide matrix composites sliding against steel ball were evaluated with a ball-on-disk tribotester under distilled water condition. Meanwhile, the effect of different length of carbon fiber on the wear resistance of polyimide matrix composites was investigated during the sliding process. Findings – The friction coefficients and specific wear rates of polyimide composites containing 100 μm carbon fibers were lower than those of other specimens. The wear mechanism of carbon fiber-reinforced composites was delamination under distilled water condition. The interfacial combination between the carbon fiber and matrix became worse with the increase of length of carbon fiber. Originality/value – This paper reported the effect of the different length of carbon fiber on polyimide matrix composites to prepare mechanical parts in mining industrial fields.

Enhanced thermal conductivity for polyimide composites with a three-dimensional silicon carbide nanowire@graphene sheets filler

2015 ◽  
Vol 3 (9) ◽  
pp. 4884-4891 ◽  
Author(s):  
Wen Dai ◽  
Jinhong Yu ◽  
Yi Wang ◽  
Yingze Song ◽  
Fakhr E. Alam ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Three Dimensional ◽  
Graphene Sheets ◽  
Polyimide Composites ◽  
Polyimide Matrix ◽  
Enhanced Thermal Conductivity

3DSG incorporated into a polyimide matrix greatly enhanced its thermal conductivity (up to 2.63 W m−1 K−1), approximately a 10-fold enhancement in comparison with that of neat polyimide.

Polyimide Composites from ‘Salt-Like’ Solution Precursors

2001 ◽  
Vol 13 (4) ◽  
pp. 235-250 ◽  
Author(s):  
Roberto J Cano ◽  
Tan H Hou ◽  
Erik S Weiser ◽  
Terry L St Clair
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Compression Strength ◽  
Elevated Temperatures ◽  
Flexural Modulus ◽  
Matrix Composites ◽  
Compression After Impact ◽  
Open Hole ◽  
Polyimide Composites ◽  
Polyimide Matrix

Four NASA Langley-developed polyimide matrix resins, LaRC™-IA, LaRC™-IAX, LaRC™-8515 and LaRC™-PETI-5, were produced via a ‘salt-like’ process developed by Unitika Ltd. The salt-like solutions (65% solids in NMP) were prepregged onto Hexcel IM7 carbon fibre using the NASA LaRC™ multipurpose tape machine. Process parameters were determined and composite panels fabricated. The temperature dependent volatile depletion rates, the thermal crystallization behaviour and the resin rheology were characterized. Composite moulding cycles were developed which consistently yielded well consolidated, void-free laminated parts. Composite mechanical properties such as the short beam shear strength; the longitudinal and transverse flexural strength and flexural modulus; the longitudinal compression strength and modulus; and the open hole compression strength and compression after impact strength were measured at room temperature and elevated temperatures. The processing characteristics and the composite mechanical properties of the four intermediate modulus carbon fibre/polyimide matrix composites were compared to existing data on the same polyimide resin systems and IM7 carbon fibre manufactured via poly(amide acid) solutions (30–35% solids in NMP). This work studies the effects of varying the synthetic route on the processing and mechanical properties of the polyimide composites.

Investigation of Carbon Fibre Reinforced Composites Based on Novel Phenylethynyl-Terminated Polyimde

2011 ◽  
Vol 415-417 ◽  
pp. 310-315
Author(s):  
Cheng Xia Tong ◽  
Guo Dong Dang ◽  
Chun Hai Chen ◽  
Hong Wei Zhou
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
High Performance ◽  
Room Temperature ◽  
Aerospace Applications ◽  
Aging Test ◽  
Before And After ◽  
High Performance Composite ◽  
Polyimide Composites ◽  
Polyimide Matrix

As part of the continuing studies to develop high performance composite based on new kind of phenylethynyl end-capped imide oligomers for aerospace applications, PETI-type polyimide composites were prepared from carbon fibre (CF) and polyimide matrix resin derived from dianhydride (s-BPDA), 2,5-bis(4-aminophenoxy)-biphenyl(p-TPEQ) and 4-phenylethynylphthalic anhydride (PEPA). The mechanical properties were tested at both room temperature and 177 °C. The flexural properties were determined by 3-point-bending at room temperature. Thermal aging test was carried out by exposing samples at 177°C over 1000 hours, and the mechanical properties were also evaluated before and after isothermal aging. It was demonstrated that the composite had good thermal and mechanical properties.

Single-Wall Carbon Nanotube Polymer Composites: Investigating Their Percolative Behavior and Physical Performance

Aerospace ◽  
2004 ◽  
Author(s):  
Zoubeida Ounaies ◽  
Cheol Park ◽  
Joycelyn Harrison
Keyword(s):  
Electric Fields ◽  
Qualitative Assessment ◽  
Single Wall Carbon Nanotubes ◽  
Mechanical And Thermal Properties ◽  
Dc Conductivities ◽  
Single Wall Carbon ◽  
Bending Strain ◽  
Electrical And Dielectric Properties ◽  
Polyimide Composites ◽  
Polyimide Matrix

In this work, an approach to enhance the electroactive response of polymers is pursued. Single-wall carbon nanotubes (SWNT) nanoinclusions are dispersed in a piezoelectric polyimide. A qualitative assessment of dispersion is done using optical microscopy and high resolution scanning electron microscopy. Key requirements for the resulting nanocomposites are flexibility, and thermal and chemical stability. Electrical and dielectric properties of the SWNT-reinforced polyimide composites are investigated as a function of SWNT concentration. AC and DC conductivities are measured. The experimental dielectric constant was found to obey a percolation-like power law with a relatively low percolation threshold. It is found that addition of the SWNT in the polyimide composites facilitates poling and results in an increase of the piezoelectric properties of the composites. Furthermore, at higher SWNT concentration, a bending strain is observed at relatively low electric fields, indicating the potential of using these composites actuators. Current investigations illustrate the effects of SWNTs on dielectric, piezoelectric and electroactive properties. Further work is ongoing to assess the effect SWNTs on the mechanical and thermal properties of the polyimide matrix.

Recent advances in polyimide composites

1993 ◽  
Vol 5 (2) ◽  
pp. 77-95 ◽  
Author(s):  
Doug Wilson
Keyword(s):  
Thermal Properties ◽  
Oxidative Stability ◽  
Review Paper ◽  
Matrix Composites ◽  
Recent Advances ◽  
Recent Developments ◽  
Polyimide Composites ◽  
Polyimide Matrix

Polyimide matrix composites possess an excellent balance of physical and thermal properties. However, currently available systems suffer from a number of drawbacks. Much of R & D is aimed at overcoming these drawbacks and developing new and novel polyimide materials. This review paper will examine recent developments in polyimide composites in the areas of thermo-oxidative stability, resistance to microcracking, toughness, toxicity and processability.

Improved mechanical properties of aligned multi-walled carbon nanotube/thermoplastic polyimide composites by hot stretching

2018 ◽  
Vol 53 (9) ◽  
pp. 1241-1253 ◽  
Author(s):  
Tran H Nam ◽  
Ken Goto ◽  
Toshiki Kamei ◽  
Yoshinobu Shimamura ◽  
Yoku Inoue ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Volume Fraction ◽  
High Heat ◽  
Melt Processing ◽  
Multi Walled Carbon Nanotube ◽  
Vertically Aligned ◽  
Polyimide Composites ◽  
Polyimide Matrix ◽  
Surface Morphologies

High heat resistance composites based on thermoplastic polyimide resin and aligned multi-walled carbon nanotube sheets have been developed using hot-melt processing method with a vacuum-assisted system. The horizontally aligned carbon nanotube sheets were produced from vertically aligned carbon nanotube arrays using drawing and press-winding techniques. Effects of processing conditions, carbon nanotube contents, and hot stretching on the mechanical properties of the composites were examined. The aligned carbon nanotube/thermoplastic polyimide composites were fabricated successfully at a temperature of 410℃ under 2 MPa pressure. The surface morphologies of the composites showed high alignment and dense packing of carbon nanotubes, and a good impregnation of the thermoplastic polyimide matrix into the aligned carbon nanotube sheets. The best mechanical properties of the aligned carbon nanotube/thermoplastic polyimide composites were achieved at the carbon nanotube volume fraction of about 50% in this study. Hot stretching of the aligned carbon nanotube/thermoplastic polyimide composites at the temperatures above the glass transition temperature and below the melting temperature improved the mechanical properties of the composites considerably.

Investigation of the Effect of Mechanical Activation of Powder Components on the Properties of Polyimide Composites

2020 ◽  
Vol 992 ◽  
pp. 353-358
Author(s):  
N.I. Cherkashina ◽  
O.V. Kuprieva ◽  
N.V. Kashibadze
Keyword(s):  
Tensile Strength ◽  
Mechanical Activation ◽  
Relative Elongation ◽  
Tensile Modulus ◽  
Elongation At Break ◽  
Dispersed Filler ◽  
The Matrix ◽  
Polyimide Composites ◽  
Polyimide Matrix ◽  
Scanning Electron

This study presents the results of an analysis of the influence of joint mechanical activation of a polyimide matrix and tungsten (IV) oxide (WO2) on the mechanical properties of their composites. Mechanical activation of the powder components of the matrix and the filler is performed in a vortex jet mill. The ultimate tensile strength, tensile modulus and relative elongation at break of the composites are all investigated. When using mechanical activation, an increase in tensile strength of 9% is observed with a content of 30 wt.% WO2 filler and of 12% with a content of 70 wt.% WO2 filler compared to composites in which the joint mechanical activation of components is not used. Using scanning electron microscopy, it is shown that the use of mechanical activation by dispersing in a jet-vortex mill made it possible to achieve a uniform distribution of highly dispersed filler based on tungsten dioxide in a polyimide matrix.

Graphite Fiber/Polyimide Composites with Improved Processability

1993 ◽  
Vol 305 ◽  
Author(s):  
Peter Delvigs ◽  
David L. Klopotek ◽  
Paul J. Cavano
Keyword(s):  
Glass Transition ◽  
Dimethyl Ester ◽  
Thermomechanical Properties ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Graphite Fiber ◽  
Thermooxidative Stability ◽  
Polyimide Composites ◽  
Polyimide Matrix ◽  
Monomethyl Ester

AbstractIn an effort to improve the processing characteristics of addition-type polyimide matrix resins, the use of flexibilized three-ring and four-ring aryl diamines was investigated. A series of fourteen diamines containing carbonyl and methylene, as well as thio connecting groups was synthesized. The diamines were polymerized with the dimethyl ester of 3,3,′4,4′-benzophenonetetracarboxylic acid, using the monomethyl ester of nadic acid as an end cap. The effect of diamine structure on the solubility and rheological properties during cure, as well as glass transition temperature and thermooxidative stability of neat resins was determined. Graphite fiber-reinforced composites were fabricated from selected resin formulations, and composite thermomechanical properties were investigated.

Physical-mechanical characteristics of composite based on polyimide matrix filled with tungsten oxide

2019 ◽  
pp. 15-25
Author(s):  
V. I. Pavlenko ◽  
◽  
G. G. Bondarenko ◽  
N. I. Cherkashina ◽  
◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Mechanical Characteristics ◽  
Polyimide Matrix
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