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Melting point 23 to 28 °C (73 to 82 °F; 296 to 301 K) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
In presence of even a small amount of oxygen, singlet oxygen is formed during operation, by energy transfer from the excited polymer molecules to oxygen molecules. These oxygen radicals then attack the structure of the polymer, leading to its degradation. [citation needed] PPV has also been investigated as an electron-donor in organic solar ...
Polychlorotrifluoroethylene (PCTFE or PTFCE) is a thermoplastic chlorofluoropolymer with the molecular formula (CF 2 CClF) n, where n is the number of monomer units in the polymer molecule. It is similar to polytetrafluoroethene (PTFE), except that it is a homopolymer of the monomer chlorotrifluoroethylene (CTFE) instead of tetrafluoroethene.
Because of its high melting point and good temperature stability, polymethylpentene is used for autoclavable medical and laboratory equipment, microwave components, and cookware. It is also often used in electrical components e.g. LED molds because it is an excellent electrical insulator.
Melting point: 260 °C Maximum operating temperature 204 °C Water absorption (ASTM) <0.01 % after 24 hours Dielectric constant (Dk) at 1M Hz: 2.1 Dissipation factor at 1M Hz: 0.0007 Arc resistance < 300 seconds Resistivity at 50% R.H. > 10 16 Ω m
Vapor phase lubrication is achieved by heating the liquid lubricant above its boiling point. The resultant vapors are then transported to the hot bearing surface. If the temperatures of the bearing surface are kept below the lubricant’s boiling point, the vapors re-condense to provide liquid lubrication.
[6] [8] Examples include aircraft fuel systems, mechanical components of devices used in airspace, deep space or high vacuum and at cryogenic temperatures. [6] PFPEs may be used in mold release agent for plastic injection molding. [6] As top coating lubricant on computer disc drives and Scanning Electron Microscope [6] [8]: 275
The water molecules must reorient around the nonpolar regions of PNIPA which results in a decreased entropy. At lower temperatures, such as room temperature, the negative enthalpy term ( Δ H {\displaystyle \Delta H} ) from hydrogen bonding effects dominates the Gibbs free energy , Δ G = Δ H − T Δ S {\displaystyle \Delta G=\Delta H-T\Delta ...