Absorption coefficient, ethylene

The absorption spectrum for a typical stabilizer of this type, 2-hydroxy-4-dodecyloxybenzophenone, is shown in Figure 8 (10) along with that of poly (ethylene—CO). Over the near ultraviolet range, the absorption coefficient of the stabilizer is much greater than that of the polymer, and even at low concentrations the stabilizer will absorb most of the light, thereby protecting the polymer. 

Ethylene. The ethylene absorption spectrum has three continua140 with bands superposed. Figure 23 presents the absorption coefficients. The continuum from 1375 to 2000 A. whose maximum lies at about 1620 A. corresponds to the V(Biu) — NQAi,) transition. While the CH2 groups in the ground-state molecule are coplanar, the upper state... 

Anderson and Spear (1977) have determined the change in the optical gap energy Eopt in a-Si C iH with composition. The value of increases monotonically with decreasing x, from 1.6 eV at x = 1.0 to a maximum of 2.8 eV at x = 0.3 and decreases down to 2.4 eV at x = 0, for the films GD-deposited from silane-ethylene mixtures at about 200°C. Figure 3 shows the (ahv)1/2 versus hv plot, where a is the absorption coefficient and hv is photon energy, for several samples prepared by GD decomposition of silane-tetramethylsilane mixtures at the same substrate temperature. The... 

ASTM D 3349-93. Absorption coefficient of ethylene polymer materials pigmented with carbon black. 

Fig. 4.16 The molar absorption coefficient, e, for selected bands of compressed fluid ethylene (E) and polyethylene (PE) between 2000 and 12000 cm .

Table 3.1 shows some values of the Ostwald absorption coefficient y of argon in water and in some liquids. It should be noted that the solubility as measured by y is about an order of magnitude smaller in water compared with other solvents. Note, however, that the solubility of argon in ethylene glycol at 25°C is about 0.035, almost the same as in water Isee Ben-Naim (1968)]. 

The DIAL system telescope was pointed towards a building situated at about 1 km to the west of the Institute Pluridisciplinar of the Universidad Com-plutense de Madrid. The topographic target, consisting primarily of a concrete wall, scattered radiation that was collected by the 40 cm Newtonian telescope. In the measurements presented here, the P(14) and P(28) lines of the vibrational transition (00° 1-020) of CO2 were used, because they coincide with transitions in the 10 pm band of ethylene they also avoid interference with other gases such as NH3 and H2O, and minimize the effect of atmospheric CO2. Note that for the two aforementioned laser lines, the differential-absorption coefficient of CO2, for average atmospheric concentration levels of 360-380 ppm, at standard temperature and pressure, is only 0.011 km (e.g. see Finlayson-Pitts and Pitts (1997)). 

The Aon P(14) line is more strongly attenuated than the P(28) line by ambient ethylene because its absorption coefficient is larger. Measurement data were recorded on several days between approximately 10 00 and 19 30 here, the measurements carried out on the 12 May 2003 are shown (Figure 28.22). 

Fig. 1. Main absorption coefficients of ozone (Harren et al. 1990b), ammonia (Brewer and Bruce 1978) and ethylene (Brewer et al. 1982) of the CO2 laser wavelength region (9-11 pm)...

Gel Swelling. Starobinets et al. have studied interactions and differential absorption coefficients for poly(ethylene terephthalate) in mixed solvents by gravimetric analysis of swollen gels. 

Anderson and Seyfried [40] have given a value for the extinction coefficient of the traws-ethylenic double-bond absorption at 967 cm" in terms of a functional group absorption coefficient. The value agrees reasonably well with those quoted by Hampton [36] and with those from the A.P.I. series. The latter (on the basis of the whole molecular weight of the compounds) range from 132 to 141, whilst Shreve et al. [38] give 140—156 for elaidic acid and related materials. The variation from compound to compound is appreciable, but is small in relation to other materials, such as, for example, methyl oleate and triolein, for which Shreve gives values of 12.2 and 74.4, respectively. 

Siu H, Duhamel J (2012) Molar absorption coefficient of pyrene aggregates in water generated by a poly(ethylene oxide) capped at a single end with pyrene. J Phys Chem B 116 1226-1233... 

Chemical methods for structure determination in diene pol3 mers have in large measure been superseded by infrared absorption techniques. By comparing the infrared absorption spectra of polybutadiene and of the olefins chosen as models whose ethylenic structures correspond to the respective structural units, it has been possible to show that the bands occurring at 910.5, 966.5, and 724 cm. are characteristic of the 1,2, the mns-1,4, and the m-1,4 units, respectively. Moreover, the proportion of each unit may be determined within 1 or 2 percent from measurements of the absorption intensity in each band. The extinction coefficients characteristic of each structure must, of course, be known these may be assigned from intensity measurements on model compounds. Since the proportions of the various units depend on the rates of competitive reactions, their percentages may be expected to vary with the polymerization temperature. The 1,2 unit occurs to the extent of 18 to 22 percent of the total, almost independent of the temperature, in free-radical-polymerized (emulsion or mass) poly butadiene. The ratio of trans-1,4 to cfs-1,4, however,... 

Additional tests for polymer films that have been mentioned in the literature are the tear strength of ethylene-vinyl acetate plasticiser [108], coefficient of friction of polyolefin plasticiser blown film [109], and oxygen absorption in food packaging films [110]. 

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