Nonoriented films

Notes 300 nm, 23 °C water vapour transmission rate at 25 °C P(HB-HV) (94/6) " tensile strength oriented fibre nonoriented film Young s modulus elongation at break. 

ST = Special transparent H = High gloss 8 and 9 = nonoriented films... 

Item Method Unit Nonoriented Film Oriented Film OPP Film PET Film... 

The only known commercial producer of polyvinyl fluoride is DuPont Company. Tedlar is DuPont s trademark for oriented and unoriented films and three grades of PVF resin for special coatings applications. PVF films are tough, durable, preformed polyvinyl fluoride films that are manufactured in continuous rolls. PVF films can be oriented or nonoriented. Film thickness can range from 12.5 to 75 pm and can be treated for adherability or left untreated for release applications. 

Nonoriented Tedlar SP films (Types 8 and 9) offer excellent conformability to almost any shape or substrate while maintaining the durability, chemical resistance, and ease of cleaning expected of PVF film.1 ] Nonoriented films are available as multilayer films without adhesives or heat sealing. Multilayer technology allows for effects such as pearlescent or metallic colors. The Tedlar SP process allows a pigmented base layer to be covered with an integral clear top layer. 

Poly(vinyl fluoride) is available from Du Pont both as a resia and as transparent and pigmented films under the trademark Tedlar PVF film. Films are available ia nonoriented and oriented grade ia several tensile modifications and thicknesses, with either adherable or nonadherable release-grade surfaces. The 1992 prices ranged from 30 to 70/kg, vs 24 to 62/kg ia 1988. Prices for specially tailored films were significantly higher. 

Fig. 8. Dichroism of electronic absorption spectra of oriented and nonoriented PAN films after IR irradiation, (a) Dependence of optical density ( >) on the wavelength for various values of (angle between film orientation axis and light polarization plane).

In Fig. 14 are presented the heats of adsorption of hydrogen on nickel for oriented as well as nonoriented evaporated films. It may be recalled... 

Beeck, Smith, and Wheeler 298) prepared nonoriented and oriented nickel films, the latter showing (110) planes parallel to the substrate on which they were condensed. They showed that the catalytic hydrogenation of ethylene at 0°C. proceeds five times more quickly on these oriented films than on randomly oriented films. The heats of chemisorption of... 

In order to gain information on the elecronic structure of polymer sulfur nitride, (SN)X, we investigated the photoemission properties of this interesting material. The measurements were obtained on nonoriented (SN)X films using x-ray and variable ultraviolet photoemission spectroscopy (XPS and UPS) (1), (2). Table 1 shows the nitrogen and sulfur core levels in (SN)X and in neutral elements. 

A partially crystalline polymer that is not fully crystallized during processing will shrink when heated to a certain temperature. When the chain mobility is increased enough for the chain to begin to form into crystallites, the polymer will shrink, since the crystallites occupy less volume than the amorphous regions. This behavior can be seen if one heats a nonoriented PET or nylon film. Most often it is associated with nonpackaging applications like the shrinkage of polyester fabrics when washed in water that is too hot. 

Renoprop, Nonoriented polypropylene film, American Renolit... 

Fig. 2. Typical stress-strain curves for oriented and nonoriented polypropylene films.

As in the case of crystallinity, the sample is assumed to be composed of the oriented and nonoriented fractions, defined by / and 1-/, respectively. Using the observed dichroic ratio of a partially oriented polymer film or fiber, the fraction of oriented material is given by [19]... 

Self-standing polyimide films with thicknesses ranging between 25 and 150 xm are commercially available either as nonoriented amorphous materials primarily used as adhesives or oriented films with... 

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