Polyethylene terephthalate sheets

Kashiwagi et al.10) determined the second moment anisotropy for the one-way drawn polyethylene terephthalate sheets discussed above. The three lattice sums S00, S2q and S4o were calculated from the crystal structure determination of Daubeny et al., the proton positions being calculated on the basis of known bond angles and lengths. The isotropic lattice sum S00 was adjusted to a value consistent with the measured isotropic second moment of 10.3G2. The values for P200, P220 etc. were then used to predict the optical anisotropy. The predicted refractive indices for the sheets of draw ratio 2 1 and 2.5 1 are shown in Fig. 10, together with the experimental... 

Table 7. Full Set of Compliances for the Oriented Polyethylene Terephthalate Sheet with Orthorhombic Symmetry...

Similar isochronous studies have been carried out on polyethylene terephthalate sheets with orthorhombic symmetry by Ladizesky and Ward, on cold-drawn Nylon 6 and 66 by Owen and Ward and on oriented polypropylene by Owen and Ward. ... 

Fig. 2. The variation of tensile yield stress with 0, the angle between the initial draw direction and the tensile axis. The material is oriented polyethylene terephthalate sheet, draw ratio 5 1. Equation (8) was used to construct the full-line and is a good fit to the available data (after Brown et...

Taxol(0.0and8.8 wt%)loadedpoly(styrene-h-isobutylene-fe-styrene) (SIBS) cast from 75 25 toluene THF solution on clean polyethylene terephthalate sheets. 

Table 7.8 Full set of compliances for an oriented polyethylene terephthalate sheet with orthoihombic symmetry ...

Figure 8.4 Schematic diagram of compression apparatus. (Reproduced from Wilson, I., Cunningham, A., Duckett, R.A. et al. (1976) The determination of the extensional compliance perpendicular to the plane of sheet for thin polyethylene terephthalate sheets, j. Mater.

Experiments comparing narrow strips cut in the 1 and 3 directions (Figure 8.3), together with a theoretical analysis of the frictional effects, indicated that for polyethylene terephthalate sheets the frictional constraints prevented any strains developing in either the 1 or the 3 directions. In this case = C3 = 0 and 02 = C22C2 or... 

Figure 8.7 Arrangement of Michelson interferometer apparatus for measuring Poisson s ratio. (Redrawn from Wilson, I., Cunningham, A. and Ward, I.M. (1976) Determination of Poissons ratio compliances for polyethylene terephthalate sheets using a Michelson interferometer. I. Mater. Sci., 11, 2181. Copyright (1976).)...

Oriented Polyethylene Terephthalate Sheet with Orthorhombic Symmetry... 

All nine independent elastic constants have been determined for one-way drawn oriented polyethylene terephthalate sheet. The sheet was prepared by drawing isotropic sheet at constant width. It has been shown that there is then both a high degree of chain orientation in the draw direction and that the (100) crystal planes (which mainly reflect preferential orientation of the terephthalate residues in the chain) are preferentially oriented in the plane of the sheet. This type of orientation has been termed uniplanar axial. From the viewpoint of elastic anisotropy, the sheet possesses three orthogonal planes of symmetry and can be described as possessing orthorhombic symmetry. 

Wilson, 1., Cunningham, A. and Ward, l.M. (1976) Determination of Poissons ratio compliances for polyethylene terephthalate sheets using a Michelson interferometer. 

Figure 5.90 Influence of weathering conditions fora weathering duration of 46 days on the optica appearance of polyethylene terephthalate sheets (backed with a patterned background from left to right non-weathered, dry weathered, humidity weathered, wet weathered [687])...

Erchiqui, F Souli, M., and Ben Yedder, R. (2007) Nonisothermal finite-element analysis of thermoforming of polyethylene terephthalate sheet incomplete effect of the forming stage. Polym. Eng. Sci., 47, 2129-2144. 

The primary substrates or support iaclude many types of paper and paperboard, polymer films such as polyethylene terephthalate, metal foils, woven and nonwoven fabrics, fibers, and metal cods. Although the coating process is better suited to continuous webs than to short iadividual sheets, it does work very well for intermittent coating, such as ia the printing process. In general, there is an ideal coater arrangement for any given product. 

Fig. 4.14 (a) Optical transmittance of graphene on a polyethylene terephthalate (PET) flexible substrate [19]. Optical and electrical data for PEDOT PSS-based composites with SWCNT (b) transmittance at 550 nm, (c) sheet resistance, (d) DC conductivity and (e) ratio of DC to optical conductivity. 

LB films prepared from a 3 2 charge-transfer complex of TMTTF and TCNQ and transferred to cadmium-arachidate (five layers) precoated sheets of polyethylene terephthalate ESR... 

An acid-leached polyethylene terephthalate (Mylar) sheet was placed inside the circumference of the centrifuge bowl to enable rapid recovery of trapped particles. Particles and lake water (4 L), retained in the centrifuge bowl after the selfsealing device isolated the bowl, were recovered and kept at 4 °C for transport to the laboratory. Time delay from the collection to laboratory processing varied from 24 to 36 h. At typical lake-water particle concentrations of 1 mg/L, more than 0.5 g of suspended particles could be collected in 1 h. On-station time limited the number of large-volume depths sampled per cruise to six or seven. The depths chosen were selected to be representative of distinct layers of the water column and also to correspond to depths at which sediment traps were deployed. 

A monomer needed to synthesize polyethylene terephthalate (PET), a polymer used to make plastic sheeting and soft drink bottles (Section 22.16), shows a strong absorption in its IR spectrum at 1692 cm" and two singlets in its h NMR spectrum at 8.2 and 10.0 ppm. What is the structure of this monomer (molecular formula CsHeO ) ... 

Three polymer sheets of poly(methyI methacrylate) (PMMA), polyethylene terephthalate glycol modified (PETG) and polyethylene terephthalate (PET) were used. These polymers are all transparent with thicknesses of 1.5, 1.0 and 0.26 mm, respectively. Couponshaped samples of 1 4 cm were made from all three polymers and... 

Alkyd resins have been the workhorse for the coatings industry over the last half century. The term alkyd was coined to define the reaction product of polyhydric alcohols and polybasic acids, in other words, polyesters. However, its definition has been narrowed to include only those polyesters containing monobasic acids, usually long-chain fatty acids. Thus thermoplastic polyesters typified by polyethylene terephthalate (PET) used in synthetic fibers, films, and plastics and unsaturated polyesters typified by the condensation product of glycols and unsaturated dibasic acids (which are widely used in conjunction with vinylic monomers in making sheet molding compounds or other thermosetting molded plastics) are not considered as part of the alkyd family and are beyond the scope of the present discussion. 

Polymers have a wide range of properties and uses. Mylar sheet polymer (another polyethylene terephthalate) is used to protect documents, such as this photocopy of a later version of the Declaration of Independence (top). Another kind of polymer coating is used to make shatterproof covers on glass items such as fluorescent light bulbs (bottom). 

Plastic plates are about 0.2 mm thick and are made of inert and flexible polyethylene terephthalate. They are easy to cut, and modem sheets can be bent considerably without the coating flaking off. They are resistant to nearly all organic solvents but will dissolve in H2SO4 after long exposure and tend to warp if placed on a hot plate to dry the sample spots. Polyvinyl alcohol often is used as a binder. 

Polyethylene terephthalate, also known as PETE or simply 1, is a form of polyester often used to make bottles and jars to contain food. When collected, it is ground up into flakes and formed into pellets. The most common use for recycled PETE is the manufacture of polyester carpets. But it may also be spun into a cotton-candy-like form that can be used as a fiber filling for pillows or sleeping bags. It may also be rolled into thin sheets or ribbons and used as tapes for VCRs or tape decks. Reuse to produce bottles and jars is also common. 

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