Spectra polyvinyl chloride

Comparison of the 13C NMR spectrum of commercial polyvinyl chloride with the CMR spectra of racem- and meso-2,4-dichloropentane permits signal identification of the syndiotactic, heterotactic and isotactic methine carbons of the polymer [262]. 

Infrared Spectra of High Polymers Table 11. Infrared Spectrum of Polyvinyl Chloride... 

Polyvinyl chloride furnishes a good example of how the infrared spectrum can provide confirmatory evidence on the nature of the isomeric structure. 

Johnsen, U. High resolution nuclear resonance spectrum of polyvinyl chloride. 

For yellov flame there is no problem, because it is always obtained easily. The polyvinyl chloride has no relation to the flaime spectrum, but it has a role in making the flame transparent and for obtaining a clear yellow. 

Fig. 19. Change and decay of ESR spectrum of polyvinyl chloride irradiated to 40 MR at —196 C on storage at room temperature in a nitrogen atmosphere. ESR spectra were measured at—196°C [118].

Pyrolysis and reforming of several types of common plastics (polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polyurethane, and polycarbonate) were studied qualitatively, using a micro-reactor interfaced with a MBMS. Each type of plastic pyrolyzed at 550-750°C. This was followed by steam reforming of vapors in a fixed bed of C-11 NK catalyst at 750-800°C. The composition of the product gas (mass spectrum) was observed for different values of the steam-to-carbon mtio and space velocity that changed depending on the size of plastic samples. Preliminary tests showed that at process conditions similar to those used for reforming natural gas, polymers were almost completely converted to hydrogen and carbon oxides. 

Figure 7. i4 125.8-MHz NMR spectrum of the methane carbon region in polyvinyl chloride, 10% in 1,4-dioxane-da at 370 K. Configurational assignments are based on the relative triad intensities assuming Bernoullian statistics ( Sj. 

Because of their favourable cost-performance ratio, polyvinyl chloride (PVC) coated polyester (PET) fabric is the most common basic material used. It can be applied over the whole spectrum from small temporary to wide-span structures. With a top-coat that protects the PVC from soiling and early ageing, a life-span of up to 20-25 years can be obtained. PVC-PET composites are joined by high-frequency or hot wedge welding. With flame-retardant additives to the PVC coating, fire class B1 can be achieved. 

FIGURE 2.8 NMR spectra recorded for a polyvinyl chloride (PVC)-derived char. The bottom spectrum was recorded with normal CP pulse sequence, whereas a dephasing delay (x) was used for recording the top spectrum (CP/DD). Stars indicate spinning sidebands. 

Fig. 10a shows the experimental spectrum for undeuterated polyvinyl chloride in chlorobenzene at 140 . The spectrum (b) has been calculated using the same six-spin model we have already described. The match can be seen to be very good. 

Fig. 10. (a) 220 MHz j5-proton spectrum of polyvinyl chloride (5 % w/v in chlorobenzene at 140°). (b) Spectrum calculated from parameters in Table 2 (ref. 16). The lower part of the figure shows the six calculated tetrad subspectra comprising spectrum (b) (ref 17)... 

Fig. 4.59 Infrared spectrum of polyvinyl chloride (PVC) showing pristine PVC, after aging in acetic acid, and the difference between the two spectra.

Let us now consider the case of plasticized polyvinyl chloride (PVC). The polymer is formed from vinyl chloride monomer as shown below, and the spectrum is given in Figure 10.4. 

Polyvinyl chloride is quite a simple polymer. What should we expect to see in the spectrum There should be CH2 bands near 3000 and 1450 cm and C—Cl-related vibrations near 700 cm In addition, fingerprint bands would... 

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