Results 21 to 30 of about 38,523 (307)

Preparation of Polyimide Films with Ultra-Low Dielectric Constant by Phase Inversion

open access: yesCrystals, 2021
Due to the high value of its dielectric constant, polyimide does not meet the requirements of the development of integrated circuits and high-frequency printed circuits.
Panpan Zhang   +4 more
doaj   +1 more source

Preparation and Thermal Properties of Silicon-containing Polyimide Composite Films

open access: yesChemical Engineering Transactions, 2017
Aromatic polyimide is a kind of polymer material with high temperature resistance, low temperature resistance, radiation resistance, excellent chemical stability, excellent electrical properties and good mechanical strength.
Lifeng You
doaj   +1 more source

Chapter 6: High-performance polyimide fibers

open access: yesAdvanced Industrial and Engineering Polymer Research, 2022
The highly conjugated chemical structure of polyimide fibers has endowed polyimide with outstanding mechanical properties, high thermal stability, good solvent resistance, and excellent light stability, resulting in a wide application prospect in ...
Qinghua Zhang   +3 more
doaj   +1 more source

Preparation and visible-light photocatalytic activity of PMDA/PDA linear polyimide

open access: yesJournal of Hebei University of Science and Technology, 2019
The photocatalytic oxidation ability of polyimide is weak because of the relatively low valence band (VB). The valence band potential of the PMDA/PDA linear polyimide is +2.45 eV, showing that it has strong oxidizing property and strong oxidative ...
Qi ZHANG   +4 more
doaj   +1 more source

Anti-high speed impact properties of polyimide fiber/bismaleimide resin composites

open access: yesCailiao gongcheng, 2021
The polyimide fiber/ bismaleimide resin composites were prepared by the autoclave molding process. Effects of volume fraction of polyimide fiber and ambient temperature on the high speed impact properties were investigated using the air cannon impact ...
GU Shan-qun   +6 more
doaj   +1 more source

Principles and Application of Polyimide Fiber Bragg Gratings for Surface Strain Measurement

open access: yesApplied Sciences, 2017
Although theoretical investigation has demonstrated that fewer strain transfer layers imply a greater strain transfer ratio, as well as increased accuracy, most researchers are still focused on investigating encapsulated Fiber Bragg gratings (FBGs) in ...
Yangyang Sun   +7 more
doaj   +1 more source

Nanofracture mechanics : scanning force microscopy for the investigation of adhesion and corrosion at solid-solid interfaces [PDF]

open access: yes, 2013
Fracture processes are crucially determined by structural features on the molecular/nanometer scale (cavities, occlusions, cracks, etc.) as well as on the atomic scale (e.g. interstitial, substitutional and vacancy defects).
Kaufmann, André Nicolas
core   +1 more source

Effects of strain-rate and temperature on mechanical behavior of polyimide foam in compression

open access: yesMechanical Engineering Journal, 2016
Polymeric materials are now major materials used in various situations. However, most polymers are usually unsuitable for use in high temperature environments because of low glass transition temperature. In polymers, however, polyimide is one of polymers
Akifumi YOSHIMOTO   +3 more
doaj   +1 more source

Introducing planar hydrophobic groups into an alkyl-sulfonated rigid polyimide and how this affects morphology and proton conductivity [PDF]

open access: yes, 2019
Effects on organized structure and proton conductivity by the introduction of hydrophobic groups into the sulfonated polyimide backbone were investigated. A new sulfonated random co-polyimide with ion exchange capacity (IEC) of 2.69 meq.
Tanaka, Teppei   +7 more
core   +1 more source

Polyimide-Sputtered and Polymerized Films with Ultrahigh Moisture Sensitivity for Respiratory Monitoring and Contactless Sensing

open access: yes, 2022
Respiratory monitoring and contactless sensing using the moisture produced by respiration and perspiration have garnered considerable attention in recent years.
Nan Wang   +11 more
core   +1 more source

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