Terephthalate film

BiaxiaHy oriented films have excellent tensile strength properties and good tear and impact properties. They are especially well regarded for their brilliance and clarity. Essentially all poly(ethylene terephthalate) film is biaxiaHy oriented, and more than 80% of polypropylene film is biaxiaHy oriented. Polystyrene film is oriented, and a lesser amount of polyethylene, polyamide, poly(vinyl chloride), and other polymers are so processed. Some of the specialty films, like polyimides (qv), are also oriented. 

Poly(ethylene terephthalate) film is produced by quenching extruded film to the amorphous state and then reheating and stretching the sheet approximately three-fold in each direction at 80-100°C. In a two-stage process machine direction stretching induces 10-14% crystallinity and this is raised to 20-25% by... 

Some typical properties of commercial polyfethylene terephthalate) film, e.g. Melinex (ICI), Mylar (Du Pont), are given in Table 25.6. 

The principal uses of polyfethylene terephthalate) film are electrical, particularly in capacitors, as slot liners for motors and for recording tape. Its high strength and dimensional stability have led to a number of drawing office applications. The film is also a useful packaging material whilst metallised products have a number of uses as a decorative material. 

This polymer has a slightly stiffer chain and hence slightly higher melting point and heat distortion temperatures than poly(ethylene terephthalate). Films are available (Kodel-Kodak) which have been biaxially stretched about 200% from polymer with molecular weights of about 25 000. They are similar electrically to poly(ethylene terephthalate), are weaker mechanically but have superior resistance to water and in weathering stability. Some properties are given in Table 25.6. 

The most generally useful polyester is that made by reaction between dimethyl terephthalate (dimethyl 1,4-benzenedicarboxylate) and ethylene glycol (1,2-ethanediol). The product is used under the trade name Dacron to make clothing fiber and tire cord and under the name Mylar to make recording tape. The tensile strength of polyethylene terephthalate) film is nearly equal to that of steel. 

Surface Heparinization of Poly(ethylene terephthalate) Films Modified with Acrylic Hydrogels... 

The aim of this paper is to report the bonding of heparin on poly(ethylene terephthalate) films containing an acrylic hydrogel (pHEMA), the method of preparation of the support material and some of its properties. 

Song, K. and White, J. L., Formation and characterization of cast and biaxi-ally stretched polybutylene terephthalate film, Polym. Eng. Sci., 38, 505-515 (1998). 

Property Test Method Units PEN Polyimide Polyetherimide Poly(ethylene terephthalate) film Polypropylene sulfide)... 

Orientation in polyethylene terephthalate film. J. chem. Phys. 27,... 

Initial adhesion tests were made with 3.5- X 1- X 0.064-inch specimens of aluminum (Aluminum Associates No. 2024) and cold-rolled steel (polished ASTM A-415). Later tests were made with strips of copper, chrome-coated steel (Weirton Steel Co.), and brass with molded nylon 66 bars and with Mylar 300A poly (ethylene terephthalate) film. Before use, the specimens were washed (scrubbed with a soft bristle brush) with a solution of Alconox detergent, rinsed with water, rinsed with acetone, and dried. 

THF and 2 g 20% Me2CO soln. of polysulfonamide binder and 7 mg formazan dye were added. The soln. was coated 0.15-mm-thick onto poly(ethylene terephthalate) film and dried to give a coating which was completely bleached when contacted a few s. with a metal block at 150°. 

Polyethylene terephthalate) film with paper backing Varnished cotton. 

Polyethylene terephthalate film (Mylar) is often used at cryogenic temperatures for electrical- or thermal insulation, as described in the preceding section. However, the radiation tolerance of Mylar is rather poor as shown in Fig. 5. Takamura and Kato reported that Mylar was too brittle to handle after irradiation of 6.2 x 106 Gy at 5 K [45]. 

Fig. 2. Cls core-level spectrum of a polyethylene terephthalate) film...

Saran (Dow polyvinylidene dichloride) is a tough, chemically resistant plastic available in a variety of forms that are useful in the laboratory. Saran pipe or tubing can easily be welded to itself or sealed to glass and is useful for handling corrosive solutions. Thin Saran film, available commercially as a packaging material, is useful for windows, support films, etc. Mylar (du Pont polyethylene terephthalate) film and other polyester films are also useful for these purposes. Mylar is chemically inert and has excellent electrical properties for electrical insulation and for use as a dielectric medium in capacitors. Much thinner than these are films that can be made in the laboratory by allowing a dilute ethylene dichloride solution of Formvar (polyvinyl acetal) to spread on a water surface and dry. 

Mylar to make recording tape. The tensile strength of poly(ethylene terephthalate) film is nearly equal to that of steel. 

IGC has been used at zero surface coverage to characterize the surfaces of cellulose (5), cellophane (6), and poly(ethylene terephthalate) film (7 ). Surface properties of Intact textile fibers were also studied by IGC (8). Domlngo-Garcla et al. (9 ) have recently characterized graphite and graphltlzed carbon black surfaces with this method, and some zero coverage results on carbon fibers have appeared (10). 

Fig. 3.9 The topography of water-soluble surface-graft 2-(dimethylamino)ethyl methacrylate chains on a polyethylene terephthalate) film imaged by CM-AFM. Reproduced with permission from [23]. Copyright 1997. American Chemical Society...

Sicardi S, Manna L, Banchero M. Comparison of dye diffusion in poly(ethylene terephthalate) films in the presence of a supercritical or aqueous solvent. Ind Eng Chem Res 2000 39 4707-4713. 

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