Highly optically transparent/low color polyimide films prepared from hydroquinone- or resorcinol-based bis(ether anhydride) and trifluoromethyl-containing bis(ether amine)s

Polymer ◽  
2006 ◽  
Vol 47 (20) ◽  
pp. 7021-7033 ◽  
Author(s):  
Chin-Ping Yang ◽  
Yu-Yang Su ◽  
Shiou-Jung Wen ◽  
Sheng-Huei Hsiao
Keyword(s):  
Polyimide Films ◽  
Optically Transparent

scholarly journals Optically Transparent and Thermal‐Stable Polyimide Films Derived from a Semi‐Aliphatic Diamine: Synthesis and Properties

2020 ◽  
Vol 221 (5) ◽  
pp. 1900506 ◽  
Author(s):  
Xiuming Wu ◽  
Chen Shu ◽  
Xiaoqian He ◽  
Shoubai Wang ◽  
Xiang Fan ◽  
...  
Keyword(s):  
Polyimide Films ◽  
Aliphatic Diamine ◽  
Optically Transparent ◽  
Thermal Stable

Optically transparent fluoro-containing polyimide films with low dielectric permeability

2014 ◽  
Author(s):  
V. Kravtsova ◽  
M. Umersakova ◽  
R. Iskakov ◽  
O. Prikhodko ◽  
N. Korobova
Keyword(s):  
Dielectric Permeability ◽  
Polyimide Films ◽  
Low Dielectric ◽  
Optically Transparent

Synthesis and characterization of optically transparent semi-aromatic polyimide films with low fluorine content

Polymer ◽  
2019 ◽  
Vol 163 ◽  
pp. 106-114 ◽  
Author(s):  
Huan Liu ◽  
Lei Zhai ◽  
Lan Bai ◽  
Minhui He ◽  
Changou Wang ◽  
...  
Keyword(s):  
Fluorine Content ◽  
Synthesis And Characterization ◽  
Polyimide Films ◽  
Aromatic Polyimide ◽  
Optically Transparent

Electron microscopy and diffraction studies of polyimides

1983 ◽  
Vol 41 ◽  
pp. 28-29
Author(s):  
O.C. de Hodgins ◽  
K. R. Lawless ◽  
R. Anderson
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Structural Features ◽  
Inert Atmosphere ◽  
Polyimide Films ◽  
Resolution Electron ◽  
The Matrix ◽  
High Resolution Electron Microscope ◽  
Diffraction Patterns ◽  
Polymeric Samples

Commercial polyimide films have shown to be homogeneous on a scale of 5 to 200 nm. The observation of Skybond (SKB) 705 and PI5878 was carried out by using a Philips 400, 120 KeV STEM. The objective was to elucidate the structural features of the polymeric samples. The specimens were spun and cured at stepped temperatures in an inert atmosphere and cooled slowly for eight hours. TEM micrographs showed heterogeneities (or nodular structures) generally on a scale of 100 nm for PI5878 and approximately 40 nm for SKB 705, present in large volume fractions of both specimens. See Figures 1 and 2. It is possible that the nodulus observed may be associated with surface effects and the structure of the polymers be regarded as random amorphous arrays. Diffraction patterns of the matrix and the nodular areas showed different amorphous ring patterns in both materials. The specimens were viewed in both bright and dark fields using a high resolution electron microscope which provided magnifications of 100,000X or more on the photographic plates if desired.

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

Influence of magnetic field to the allocation of imputiry molecules in the structure of optically transparent polymer films

2016 ◽  
Vol 38 (3) ◽  
pp. 205-210
Author(s):  
L.A. Bulavin ◽  
◽  
Yu.F. Zabashta ◽  
О.О. Brovko ◽  
L.Yu. Vergun ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Polymer Films ◽  
Optically Transparent

Polar Anchoring Properties of Photoalignment Polyimide Films

2019 ◽  
pp. 324
Author(s):  
Wei-Wei Chen ◽  
Jui-Wen Pan ◽  
Shie-Chang Jeng
Keyword(s):  
Polyimide Films
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