Polymer high temperature

N. M. Belomoina and co-workers, in M. J. M. Abadie and B. SiUiori, eds., Poljimides and Other High Temperature Polymers, Elsevier Science Pubhshers,... 

The dianhydride of 1,4,5,8-naphthalene tetracarboxyhc acid [81-30-1] has been of research interest for the preparation of high temperature polymers, ie, polyimides. The condensation of the dianhydride with o-phenylenediamines gives vat dyes and pigments of the benzimidazole type. 

Low molecular weight (1000—5000) polyacrylates and copolymers of acryflc acid and AMPS are used as dispersants for weighted water-base muds (64). These materials, 40—50% of which is the active polymer, are usually provided in a Hquid form. They are particularly useful where high temperatures are encountered or in muds, which derive most of their viscosity from fine drill soHds, and polymers such as xanthan gum and polyacrylamide. Another high temperature polymer, a sulfonated styrene maleic—anhydride copolymer, is provided in powdered form (65,66). AH of these materials are used in relatively low (ca 0.2—0.7 kg/m (0.5—2 lb /bbl)) concentrations in the mud. 

PytomeUitic acid is a commercial product, and it forms a dianhydtide which has specialized commercial appHcations, primarily as an ingredient in the preparation of high temperature polymers. The lUPAC name of the dianhydtide is lJT,3JT-benzo(l,2- 4,5-/)difiitan-l,3,5,7-tettone. 

H. A. Smith and C. E. Handlovits, Report on Conference on High Temperature Polymer and Fluid Research, Partll, Phenylene Sulfide Polymers, ASD-TDR-62-322, Dayton, Ohio, 1962, pp. 18,19. 

Teflon. Good, high-temperature polymer with very low friction and adhesion characteristics. Non-stick saucepans, bearings, seals. 

It is claimed that the cured materials may be used continuously in air up to 300°C and in oxygen-free environments to 400°C. The materials are of interest as heat- and corrosion-resistant coatings, for example in geothermal wells, high-temperature sodium and lithium batteries and high-temperature polymer- and metal-processing equipment. 

POLYIMIDES AND OTHER HIGH-TEMPERATURE POLYMERS 5.2.2.3 Dielectric Properties and Moisture Uptake... 

Diamantane-based polymers are synthesized to take advantage of their stiffness, chemical and thermal stability, high glass transition temperature, improved solubility in organic solvents, and retention of their physical properties at high temperatures. All these special properties result from their diamantane-based molecular structure [90]. Polyamides are high-temperature polymers with a broad range of applications in different scientific and industrial fields. However, their process is very difficult because of poor solubility and lack of adequate thermal stability retention [90]. Incorporation of 1,6- or... 

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