Polyethylene fluorinated

Functional perfluoropolyethers11 (Figure 14.7) can also be prepared by direct fluorination in high yields. Difunctional perfluoropolyethers based on fluorinated polyethylene glycol) are of particular interest as possible precursors for elastomers, which should have outstanding high-temperature and low-temperature properties. 

Fluorocarbon polymers can be made by fluorinating polyethylene according to the reaction... 

Table II.12. Cyclohexanone, Chlorobenzene, Hexane, Butyl Alcohol, Trichloroethlyene, Methyl Salicylate, and Tetrahydrofuran Permeability through Fluorinated Polyethylene Bottles...

Table 11.13. Ethyl Acetate, Isopropyl Acetate, Acetone, Butyl Acetate, Toluene, Xylene, Methyl Isobutyl Ketone, and Methyl Ethyl Ketone Permeability through Fluorinated Polyethylene Bottles...

Many useful polymers are not themselves the initial products of polymerization but are prepared by chemically modifying the original polymer. Partially fluorinated polyethylene used for protective gloves and to coat automobile gasoline tanks is made by exposing polyethylene to F2 diluted with nitrogen. 

Polytetrafluoroethylene. Figure 2.62 shows the analysis of the heat capacity of crystalline polytetrafluoroethylene (PTFE). The comparison between calculation and measurement is given in Fig. 2.63. As in the case of the polyoxides, it is also possible to predict heat capacities of all less fluorinated polyethylenes. The measured sample... 

Maity J, Jacob C, Das C K, Alam S and Singh R P (2008) Homocomposites of chopped fluorinated polyethylene fiber with low density polyethylene matrix, Mater Sci Eng A 479 125-135. 

After a number of semiempirical crystal-orbital (CO) calculations (extended Hvickel and CNDO/2 CO calculations for further references see Table III of Andre ) Otto et performed the first ab initio band-structure calculations on different fluorinated polyethylenes. The calculations were conducted for all six different polyfluoroethylenes, namely (CFH-CHj), (CF2-CH2), (CFH-CFH),, (CFH-CFH), (CF2-CFH)jt, and (CF2), which can be obtained from polyethylene through fluorine substitution. 

The product was a white powder which was similar in appearance to polypropylene but was more particulate and harder. The physical properties of this material were similar to the fluorinated polyethylene. The powder was thermally stable to 350 0 in air, softens at 360 C and 400°C to fluorocarbon fragments. The parent polypropylene powder melted at about 90 0 and burned at 120°C in air. 

H. Gisser (Frankford Arsenal) The direct fluorination of polyethylene film leaves a solid structure equivalent to the original state of low crystallinity unless recrystallization or molecular motion has taken place. These may be time and temperature dependent. Have any friction or other measurements been run on directly fluorinated polyethylene to explore the nature of the surface ... 

ANALYSIS OF COMPONENT PEAKS FOR FLUORINATED POLYETHYLENE SAMPLES (ALL BINDING ENERGIES IN eV)... 

Plot of relative area of Cj peak at 285.0 eV vs. log t for fluorinated polyethylene. 

Table III.15. Mineral Spirits, Turpentine, STP Gas Treatment, Paint Thinner, Charcoal Starter, and Naphtha Permeability Through Fluorinated Polyethylene Bottles...

Figure 4. Depth profiling of surface-fluorinated polyethylene which contains fluorine atoms of 9.0 pg cm, ...

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