Polyimides polymers

Electronic coatings BCB Ultrem, Siltrem Benzocyclobutene polymers Polyimides Dow, USA GE-Plastics, USA... 

Alentiev, A. Yu., Loza, K. A., and Yampol skii, Y. P. (2000). Development of methods for prediction of gas permeation parameters of glassy polymers Polyimides as altenating copolymers, J. Membrane Sci. 167, 91. 

Like most aromatic polymers, polyimide(fig. 1) absorbs strongly UV radiation in the wavelength region below 200 nm (absorption coefficient a =4.10 cm-l) (ILL. Therefore, the penetration depth of the UV light in this material is very small about two thirds of the radiation intensity is absorbed in the first 300 A of the polyimide film. 

This paper describes a new seeding process for electroless metallization of polyimides and other electroactive polymers. Polyimide films can be reduced electrochemically at an electrode surface or by contact with an appropriate reducing agent in an electrolyte solution. In the latter case, only the outer surface of the film undergoes reduction. Once the polyimide surface is reduced it then can mediate electron transfer to metal ions or metal complexes in solution causing metal to be deposited at the surface with concurrent reoxidation of the polyimide. 

ULTRAHIGH PERFORMANCE POLYMERS (POLYIMIDES, PEEK, LCPs)... 

In the example presented here the reverse micelle was prepared by dispersion of the surfactant, sodium bis(2-ethyl hexyl) sulfosuccinate (AOT) in isooctane. The hydrolysis and sol-gel processing of titanium isopropoxide was carried out in the 5 nm size cavity of the reverse micelle to produce highly uniform Ti02 nanoparticles. These particles were redispersed in a polymer (polyimide) solution and cast as a film of the polymer composite containing Ti02 nanoparticles. 

On the one hand, linear aromatic polyimides have been generally used as electronic and aerospace materials because of their excellent mechanical strength, thermal, chemical and electronic/optic properties compared with other common amorphous polymers. Polyimides are also excellent membrane materials for gas separation due to their rigid chemical structures, allowing the production of larger functional free volume. Over the... 

M.J.M. Abadie (Ed.), High Performance Polymers - Polyimides Based - From Chemistry to Applications, InTech, 2012. 

The use of adhesives can be traced back many centuries, while the production of adhesives, on an industrial scale, started about 300 years ago. The birth of modern structural adhesives can be dated from about 1910, with the introduction of the phenol-formaldehyde resins.Table II summarizes the historical development of structural adhesives, with the dates referring to the approximate time period during which each adhesive became commercially available. The introduction dates for the high-temperature polymers (polyimide, polybenzimidazole, and polyquinoxa-line) have been included for reference, although, as previously mentioned, there are presently few commercial products based on these polymers. 

Polylmide. The polymer polyimide, (C22HioOsN2)n, in the form of a film (known then as Kapton or Novax), is unusueil in the sense that it carbonizes to form a char which becomes a well-oriented graphite after heat-treatment to 3000°C (see Ch. 4, Sec. 3.5).I i... 

High Performance Polymers- Polyimides Based - From Chemistry to Applications... 

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