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Polytetrafluoroethylene cast films

D 3297 Practice for Molding and Machining Tolerances for PTFE Resin Parts D 3308 Specification for PTFE Resin Skived Tape D 3369 Specification for TFE Fluorocarbon Resin Cast Film D 4441 Specification for Dispersions of Polytetrafluoroethylene D 4591 Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning Calorimetry E 911 Specification for Glass Stopcocks with Polytetrafluoroethylene (PTFE) Plugs... [Pg.270]

Moisture resistance. The adhesive should be formulated to minimise moisture transport through the adhesive itself. The equilibrium water content (A/ ) should not exceed 3% by weight after immersion in distilled water at 20 °C. The permeability, obtained from the product of the coefficient of diffusion (D) and My, should not exceed 5 x 10 " m-/s at 20 °C (see Fig. A.l). A film of adhesive, approximately 1 mm thick cast in polytetrafluoroethylene-lined moulds and weighing at least 3 g, is suggested for this test(3). This requirement is to enhance the potential for a durable adhesive/adherend interface, even if moisture uptake is not deleterious to the adhesive itself. [Pg.300]

Skiving is a method of continuously cutting thin sheets or films from a cylinder of raw material. This process is used to produce film from polymers that are not normally amenable to extruding or solution casting. In practice, it has been used almost exclusively for production of films of Teflon TFE (polytetrafluoroethylene). Figure F.3 illustrates the skiving process. [Pg.195]

Microporous polyethylene (PE) membranes with various pore diameters and porosities and microporous polytetrafluoroethylene (PTFE) membrane were used as substrates for the plasma graft polymerization (Table II). Besides these porous substrates, homogeneous poly[ l-(trimethyl si lyl)-l-propyne] (PTMSP), which has the highest gas permeability among polymeric materials, was used as the substrate. The poly[l-(trimethylsilyl)-l-propyne] was synthesized from l-(trimethylsilyl)-l-propyne according to the literature procedure (19). Films were prepared by casting polymers from toluene solutions. Hereafter, the respective substrate membranes will be abbreviated as shown in Table II. [Pg.255]

For the analysis of optical properties, films of all nanostructured systems were prepared by spin-coating from 5 wt% solutions in dichloroethane in a similar way as described above. However, for the morphological study, the solutions were drop cast into polytetrafluoroethylene moulds of 4 cm X 4 cm X 1 cm and the solvent was removed by evaporation at room temperature. All samples were then cured at 140 °C during 24 h and post-cured at 165 °C for 2 h. [Pg.44]

Poly(amic acid) imidization was studied in a solid state under microwave irradiation as well. Polyether-ester poly (amic acid) was prepared by the polycondensation of poly (tetramethylene oxide)glycol di-p-aminobenzoate (Polymine-650) with acid dianhydride (PMDA) in a DMF solution at room temperature. Then the prepolymer solution was cast on polytetrafluoroethylene (PTFE) plates to form 200 pm thin films, which were imidized in a microwave oven at 60 °C. The results showed that microwave irradiation reduced both the reaction temperature and time. ... [Pg.1009]


See other pages where Polytetrafluoroethylene cast films is mentioned: [Pg.186]    [Pg.26]    [Pg.490]    [Pg.133]    [Pg.242]    [Pg.13]    [Pg.318]    [Pg.511]    [Pg.140]    [Pg.317]    [Pg.73]    [Pg.152]   
See also in sourсe #XX -- [ Pg.142 , Pg.147 ]




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