2 edition of mechanical properties of polyimide films after exposure to hi pH found in the catalog.
mechanical properties of polyimide films after exposure to hi pH
Catharine I. Croall
1992 by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service [distributor] in Hampton, Va, [Springfield, Va.? .
Written in English
|Statement||Catharine I. Croall and Terry L. St. Clair.|
|Series||NASA technical memorandum -- 104202.|
|Contributions||St. Clair, Terry L., Langley Research Center.|
|The Physical Object|
Polyimide is considered to be a unique type of polymer possessing excellent mechanical, thermal, and chemical properties. It is an incredibly strong material and is resistant to both heat and to corrosive chemicals. When polyimide precursors cyclize to become the cured polymer, they form two distinct types of structures: linear and heterocyclic. Glenn researchers have continued to work on improving the properties and applicability of polyimides, with the ultimate goal of offering the aerospace, chemical, and automotive industries a lower toxicity alternative to PMR that maintains similar processability, stability, and mechanical properties. The new polyimide developed by Dr. Kathy. Preparation and morphological, electrical, and mechanical properties of polyimide‐grafted MWCNT/polyimide composite. Siu‐Ming Yuen. Department of Chemical Engineering, National Tsing Hua University, Hsin‐Chu , Taiwan.
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Key properties are thermoxidative stability, high mechanical strength, high modulus, excellent insulating properties, and superior chemical resistance. Devices made of polyimide have elicited only mild foreign body reactions in several applications in the peripheral and central nervous mechanical properties of polyimide films after exposure to hi pH book showing good mechanical properties of polyimide films after exposure to hi pH book and structural by: Indian Journal of Chemical Technology Vol.
8, Maypp. Mechanical and electrical properties of polyimide blend films Sobhan Niyogi, Sukumar Maiti & Basudam Adhikari* Materials Science Centre, Indian institute of Technology, KharagpurIndiaAuthor: Sobhan Niyogi, Sukumar Maiti, Basudam Adhikari.
These descriptions explain the results that the mechanical properties degradation of the ITO-coated polyimide films decreased until AO fluence approached × 10 21 atoms/cm 2, and the mechanical properties at × 10 21 atoms/cm 2 were nearly equivalent to those at × 10 21 atoms/cm by: The mechanical properties and optical properties of the polyimide thin films were strongly dependent on the changes in the morphological structure, which originated from the variation of the.
Polyimide films were exposed to a LEO environment in the Service Module/Micro-Particles Capturer and Space Environment Exposure Device (SM/MPAC&SEED) experiment; the polyimide films were included in the SM/SEED experiment samples [7, 8]. After a, and day exposure, the degradation of the mechanical properties of polyimide films File Size: 1MB.
THE MECHANICAL STABILITY OF POLYIMIDE FILMS AT HIGH pH C. Croall* and T. Clair NASA Langley Research Center Hampton, VA Introduction Polyimide insulated electrical wire has been widely used in the aerospace industry in commercial, military, and to a lesser degree, general aviation aircraft since the early 's.
Although the aggregation and optical properties of aromatic polyimide films have mechanical properties of polyimide films after exposure to hi pH book characterized by wide-angle X-ray diffraction and UV–vis absorption spectroscopy at high pressure, its acoustic, mechanical properties and piezochromic properties still require comprehensive and detailed investigation for use as theoretical reference in Cited by: 6.
Stress, mechanical and thermal characterization of anisotropic polyimide thin films and coatings. Kapil C. Sheth Sheth, Kapil C., "Stress, mechanical and thermal characterization of anisotropic polyimide thin films and coatings." ().Doctoral Dissertations - February Experimental results showed that the average diameter of the Ru particles was about nm, these Ru particles may coordinate with N and O in polyimide, and after adding Ru-cluster, the thermal.
Mechanical Properties Short beam shear and 0° and 90° flexural strength and modulus were determined for each Òsalt-likeÓ solution composite. Mechanical properties for composites fabricated from Òsalt-likeÓ solutions are presented in Figures and Tables Polyimide films treated with an alkali and ion exchange undergo surface-confined hydrolysis to produce polyimide composites.
On the other hand, it is unclear what impact this method has on the mechanical properties of PI films. This paper reports the effects of the mechanical properties of PI films exposed to an alkali (KOH) solution with different treatment by: 1.
Polyimide Membranes - Applications, Fabrications, and Properties is essential reading for scientists and engineers interested in the separation of non-aqueous solutions, organic vapours and organic pollutants which is difficult to achieve by conventional membrane processes.
This book will also serve as a valuable reference for those having an Cited by: Polyimide (sometimes abbreviated PI) is a polymer of imide ides have been in mass production since With their high heat-resistance, polyimides enjoy diverse applications in roles demanding rugged organic materials, e.g.
high temperature fuel cells, displays, and various military roles.A classic polyimide is Kapton, which is produced by condensation of pyromellitic. Automotive / Industrial - Polyimide films have excellent mechanical, electrical, temperature and chemical resistance making them optimal mechanical properties of polyimide films after exposure to hi pH book demanding industries where performance is critical or harsh exposure conditions exist.
Electronics - Polyimide film is the optimal substrate for high temperature applications like the electronics industry. Effects of atomic oxygen (AO) on mechanical properties of polyimide films were investigated using surface topography observations and tensile tests.
The ITO‐coated polyimide films, which are expected to have a high durability against AO attacks, were also evaluated. Surfaces of polyimide films irradiated by AO were deeply eroded, exhibiting a rough by: 2.
Polyimide films are widely used in spacecraft, but their mechanical properties would degrade in space environments, such as electron, proton, near ultraviolet or far ultraviolet, etc. The mechanical property and mechanism of polyimide film in electron, proton, near ultraviolet and far ultraviolet was studied by Φ combined space radiation Cited by: 4.
A free-standing photosensitive polyimide film with thickness of 10µm is fabricated with the different curing temperatures using a micro fabrication process.
The microtensile specimens of a strip type are made to facilitate a tensile testing. The Young’s modulus and yield strength of photosensitive polyimide film are measured with various strain rates from /s to /s by using a Cited by: 1. This polyimide film can also be used in motor slot liners, magnetic wire insulation, transformer and capacitor printed circuit board masks.
This polyimide film has excellent thermal, mechanical, and electrical properties that are maintained even under extreme temperatures. The tensile force-elongation curves have been measured using a microtensile tester for aluminum thin films, deposited on a PMDA-ODA polyimide film, in the thickness range from 60 rum to nm.
The stress-strain curves for aluminum films were constructed by subtracting these curves with polyimide curves measured by: 9. Effect Of Moisture On The Physical Properties Of Polyimide Films - Volume - Rajeevi Subramanian, Michael T.
Pottiger, Jacqueline H. Morris, Joseph P. CurillaCited by: 6. electrical properties [1–4]. One of the most impor-tant applications of polyimide films is used as alignment layers in liquid crystal display (LCD) device, which enable liquid crystal to orient along its designated direction [5, 6].
For this application, polyimide films can be simply prepared by coating either polyamic acid or pre-imidized. Global polyimide films market is expected to be worth US$ mn by from US$ mn in During the forecast period of andthe overall global market is likely to /5(19).
The mechanical properties of polyimide films after exposure to hi pH [microform] / Catharine I. Croall Electromagnetic shielding tests on a room shielded with foil-faced foam board [microform] / by Paul H. On-line condition monitoring and remnant life prediction for large power generators / W.J.
Bonwick. The multilayer films showed the same dynamic mechanical properties and glass transition behavior (T g = °C) as a single‐layer film. For the multilayer films both the in‐plane dielectric constant (ε ’ XY) and out‐of‐plane thermal‐expansion coefficient (α Z) were measured Cited by: THE EFFECT OF POSS-POLYIMIDE FILM’S NANOSTRUCTURE ON ITS MECHANICAL PROPERTIES R.
Verker (1,2), E. Grossman (1), I. Gouzman (1), N. Eliaz (2) (1) Space Environment Section, Soreq NRC, YavneIsrael, +, [email protected] (2) School of Mechanical Engineering, Tel-Aviv University, Ramat Aviv, Tel-AvivIsrael ABSTRACT The amount of hypervelocity low.
KEYWORDS: Polyimides, polyimides films, carbon plastics, carbon films, carbon-carbon composites, mechanical properties, microporous texture parameters be used as precursors for C-C composites.
The mechanical properties of this kind of C-C composites increased with adding to PI matrix 40% of pitch. However it is more effective to use cheaper and. Macromolecules ,24, Effect of Thermal Curing on the Structures and Properties of Aromatic Polyimide Films Jwo-Huei Jou' and Peir-Teh Huang Department of Materials Science and Engineering, Tsing Hua University, HsinchuTaiwan, Republic of China Received Octo ; Revised Manuscript Received Febru Studied the effect of content of the polyethylene terephthalate (PET) in the polyimide (PI) on the physical and mechanical properties of the polymer compositions.
Found that an increase concentration of PET leads to changes in the morphology of polymer : A. Muradov, G. Suyundikova, A. Kunsafina. Provides coverage on the full range of topics associated with polyimides, including structure, polymer fundamentals, and product areas.
The text addresses both basic and applied aspects of the subject. It details the synthesis of polyimides, polyamideimides, and flourinated polyimides, explains the molecular design of photosensitive polyimides, and more.5/5(1). 1 1 The Thermal and Mechanical Properties of High Performance Polyimide Fibers Fuming Li 1, Zongquan Wu, Zhihao Shen 1, Kathy Chuang 2, Richard E.
Lyon 3, Frank W. Harris 1 and Stephen Z. Cheng 1* 1Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 2NASA Lewis Research Center, Cleveland, Ohio EFFECfS OF MOLECULAR WEIGHT ON MECHANICAL PROPERTIES OF THE POL YIMIDE LARC-SJTM William T.
Yost, John H. Cantrell, Thomas S. Gates, and Karen S. Whitley Materials Division NASA-Langley Research Center Hampton, VA INTRODUCTION In order to better understand the effects of molecular weight on the performance and.
Wholly aromatic polyimide (PI) films have been successfully used in modern industry for half a cen-tury due to their excellent comprehensive properties both in ordinary and in extreme environments [1–5].
However, most of the commercially available PI films possess poor thermoplastic nature, which cannot beCited by: 4. This paper aims at determining the mechanical properties such as Poisson ratio, biaxial modulus, and residual stress of polymer membranes using the bulge test and fringe projection.
Under this idea, a bulge test apparatus has been developed for robust usage, under the room temperature, in industrial environments that are usually noisy and full of all kinds of by: 2.
Joint effect of high-energy electrons, mechanical loads, and temperature on polyimide films of thicknesses in the range 30– µm is investigated. The films were preliminary irradiated by electrons in air using an ÉLU-6 linear accelerator with energy of 2 MeV and doses D = 1, 5, 10, 20, 30, 40, and MGy and then subjected to uniaxial mechanical tension at temperatures (T) from to Author: A.
Kupchishin, A. Muradov, Zh. Omarbekova, B. Taipova. Main Performance of Polyimide Film,H: 1. Excellent performance of insulation and mechanism 2. Excellent resistance to high temperature and wide range of working temperature C to +C for long time working and up to +C for short time working without.
Polyimides and Other High Temperature Polymers: Synthesis, Characterization and Applications, Volume 5 - Kindle edition by Mittal, Kash L. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Polyimides and Other High Temperature Polymers: Synthesis, Characterization and Applications, Volume by: The effect of long time aging of polyimide at high temperature (> °C) and in oxidative environment on the mechanical properties, weight loss [40,41], and chemical properties [42,43], was widely investigated for thick polyimide matrix composites (1 mm thick) used in high temperature aerospace applications.
It was found that while thermal Cited by: 9. In this comprehensive review, recent progress and developments on perfluorinated sulfonic-acid (PFSA) membranes have been summarized on many key topics.
Although quite well investigated for decades, PFSA ionomers’ complex behavior, along with their key role in many emerging technologies, have presented significant scientific challenges but also helped create a unique cross-disciplinary Cited by: Polyimide thin films were synthesized from 3,3′,4,4′‐biphenyltetracarboxylic acid dianhydride (BPDA) and four different diamines (p‐phenylene diamine, 4,4′‐oxydiphenylene diamine, 4,4′‐biphenylene diamine, and 4,4′‐sulfonyldiphenylene diamine).The nanoindentation behavior of the resulting polyimides, namely, poly(p‐phenylene biphenyltetracarboximide) (BPDA‐PDA), poly(4.
The thermal emissivity of μm thick films of PE, nylon 6, and PET have been reported as ca.andrespectively . The εATR values of PE, nylon 6, and PET films in Table 2 are close to the reference, indicating the validity of the present method.
In this experiment, PE samples were compressed and deformed by an Size: KB. Pdf formation mechanism of space pdf in polyimide (PI) which was exposed to dielectric barrier discharge (DBD) in SF 6 medium and the effects of the space charges on interfacial and electrical properties of PI were investigated.
The variation of normalized surface charge density on PI sample was calculated and illustrated for different DBD exposure by: 1.Kapton ® is the brand name of DuPont ™ polyimide films.
Polyimide films are usually thermosetting polymers synthesized by polymerizing an aromatic dianhydride and an aromatic diamine. Kapton films exhibit good chemical resistance, high dielectric strength, and excellent mechanical properties.Dynamic mechanical analysis (DMA) is a sen-sitive analysis technique20–23 that can measure the properties of ebook as they are deformed under periodic stress.
It is particularly useful for the evaluation of the viscoelastic characteristics of polymers. Usually, the dynamic mechanical characteristics of polymeric materials are time.