Plastics high-temperature

Fluorine and its compounds are used in producing uranium (from the hexafluoride) and more than 100 commercial fluorochemicals, including many well known high-temperature plastics. Hydrofluoric acid etches the glass of light bulbs, etc. Fluorochlorohydrocarbons are extensively used in air conditioning and refrigeration. 

Polypropylene has a chemical resistance about the same as that of polyethylene, but it can be used at 120°C (250°F). Polycarbonate is a relatively high-temperature plastic. It can be used up to 150°C (300°F). Resistance to mineral acids is good. Strong alkalies slowly decompose it, but mild alkalies do not. It is partially soluble in aromatic solvents and soluble in chlorinated hydrocarbons. Polyphenylene oxide has good resistance to ahphatic solvents, acids, and bases but poor resistance to esters, ketones, and aromatic or chlorinated solvents. 

Relative thermal index Section UL 746B provides a basis for selecting high temperature plastics and provides a long-term... 

Flame-retarded grades are widely used for various computer connectors and circuit board components. Representative applications are edge card connectors, grid arrays and memory modules. Non-flame-retarded grades find use in automotive under-the-hood applications, typically connectors and related parts. As higher temperature soldering techniques become more common in the automotive industry, the use of high-temperature plastics such as PCT is expected to increase. It is also possible to formulate unreinforced PCT with crystallization aids and... 

Succinodimtrile is dimorphic, with the high-temperature, plastic phase being partially disordered. The molecules of this latter phase are an equilibrium mixture... 

For cells working at high temperatures, plastics are candidates for ... 

J.J. Simonetti, High temperature plastic scintillators, US Patent 4 713198, assigned to Sangamo Weston, Inc. (Norcross, GA), December 15,1987. 

The Kirkendall effect alters the structure of the diffusion zone in crystalline materials. In many cases, the small supersaturation of vacancies on the side losing mass by fast diffusion causes the excess vacancies to precipitate out in the form of small voids, and the region becomes porous [11], Also, the plastic flow maintains a constant cross section in the diffusion zone because of compatibility stresses. These stresses induce dislocation multiplication and the formation of cellular dislocation structures in the diffusion zone. Similar dislocation structures are associated with high-temperature plastic deformation in the absence of diffusion [12-14]. 

A new generation of high-temperature plastics containing stable aromatic and heterocyclic rings in the polymer chains have use-temperature ceilings that tax... 

Use of Crosslinked VC/PE Graft Copolymers for Cable Insulation. At high temperatures, plasticized PVC cable insulations show a rather high flow. This should be improved by crosslinking of the thermoplastic insulation material. Unfortunately, PVC is not easily cross-linkable by chemical agents. The presence of about 503 of grafted or... 

Munoz, A., Gomez-Garcia, D., Dominguez-Rodriguez, A., and Wakai, E, High temperature plastic anisotropy of YTZ-single crystals , J. Em. Ceram. Soc, 2002, 22, 2609-13. 

Gomez-Garcia, D., Lorenzo-Martin, C., Munoz, A., and Dommguez-Rodriguez, A., Model of high-temperature plastic deformation of nanocrystalline materials Application to yttria tetragonal zirconia , Phys. Rev., 2003, B67, 144101-1-8. 

It should be noted that this ratio is olny empirical and indicates protective nature other factors such as good adherence, high melting point, low vapor pressure, good high-temperature plasticity to fracture, low electrical conductivity or low diffusion coefficients for metal ions and oxygen define the protection nature. 

PCT is a high temperature plastic that differs from other TP polyesters by its higher heat deflection temperature. They exhibit low moisture absorption and outstanding chemical resistance to a wide variety of chemicals. They can be flame-retarded to achieve UL 94 VO recognition down to a thickness of A6 in. (1.6 mm). Different copolyesters of PCT exhibit a wide range of properties depending on particular copolyester incorporated. 

Separation of high temperature plastic deformation and high temperature oxidation in experiments, and understanding the synergism of these phenomena. 

Use Plasticizer for polyvinylchloride, alkyd coating resins, high-temperature plastics, wire insulation, gaskets, automotive upholstery. 

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