Polystyrene intensity from

Figure 4. SANS intensities of a PB/PS IPN, on samples made by adding limited amounts of styrene monomer, and polymerizing to completion. Number following the S represents the weight-fraction of polystyrene. (Reproduced from ret 10. Copyright 1988 American Chemical Society.)...

Figure 2. Ratio of anthracene and carbazole emission intensities from freeze-dried mixtures of monodisperse polystyrene (M - 410,000) carrying 0.0092 moles/kg of the labels, relative to this ratio in films cast from solutions of a mixture of these polymers. Excitation at the carbazole absorption peak at 294 nm. Original solution in benzene dioxane (D) and cyclohexane (0). Arrows indicate l/iq] in the various solvents.

FIGURE 12.7 Temperature dependence of o-Ps (a) lifetime and (b) intensity for organically modified fluorohectorite (o), polystyrene ( ), and 25 wt%/75 wt% polystyrene/organicaUy modified fluorohectorite nanocomposite ( ). The solid line in (a) indicates the weight-average sum of the o-Ps lifetime values of the fluorohectorite and the polystyrene. (Adapted from Olson et al. [1997].)... 

Spectrophotometer intensity vs time for the determination of concentration of polystyrene radicals from the FRRPP system (Replotted with permission from Wang et al 1999)... 

Time-resolved dichroic difference spectra of atactic polystyrene generated from the spectra shown in Figure 21.3 over a little more than one cycle of the stretcher are shown in Figure 21.4, along with the variation of the applied strain over the same period. From this curve, the variation in intensity and phase of each of the bands in the spectrum can be visualized. Under the same scan conditions, it would... 

Figure 1 shows a positive static SIMS spectrum (obtained using a quadrupole) for polyethylene over the mass range 0—200 amu. The data are plotted as secondary ion intensity on a linear y-axis as a function of their chaige-to-mass ratios (amu). This spectrum can be compared to a similar analysis from polystyrene seen in Figure 2. One can note easily the differences in fragmentation patterns between the...

In recent years general purpose polystyrene and high-impact polystyrenes have had to face intensive competition from other materials, particularly polypropylene, which has been available in recent years at what may best be described as an abnormally low price. Whilst polystyrene has lost some of it markets it has generally enjoyed increasing consumption and the more pessimistic predictions of a decline have as yet failed to materialise. Today about 75% of these materials are injection moulded whilst the rest is extruded and/or thermoformed. 

Example 2.20 A cylindrical vessel with an outside radius of 20 mm and an inside radius of 12 mm has a radial crack 3.5 mm deep on the outside surface. If the vessel is made from polystyrene which has a critical stress intensity factor of 1.0 MN calculate the maximum permissible pressure in this vessel. 

Conjugated boron polymers containing platimnn or palladium atom in the main chain were also prepared by hydroboration polymerization between tetrayne/ metal complex monomers and tripylborane (scheme 16).30 From gel permeation chromatographic analysis [THF, polystyrene (PSt) standards], the number-average molecular weights of the polymers obtained were found to be 9000. The polymers were soluble in common organic solvents such as THF, chloroform, and benzene. The absorption peaks due to tt-tt transition were observed around 390 nm in the UV-vis spectra of these polymers. The fluorescence emission spectra exhibited intense peaks at 490 nm in chloroform. 

With increasing concentration of DHB, the photoproduct forms more slowly, as evidenced by decreasing loss of fluorescence intensity (Table I, entries 1-3). Nevertheless, the concentration of photoproduct(s) and RET from the polymer to photoproduct(s) are expected to increase with time, and stabilization of the polymer will eventually depend upon the capability of the photoproduct(s) to dissipate excitation energy imparted in the RET process. The observed decrease in stabilization efficiency by DHB (based on film discoloration) with exposure time in an accelerometer indicates that DHB is more effective than the photoproduct(s) in dissipating the light energy. Similar spectroscopic studies on polystyrene have led to the same conclusion in this case, as well.6... 

Figure 14 Particle size distribution of a ten-component mixture of narrow polystyrene dispersions. Left intensity measured as function of t with a turbidity detector. Right integral and differential particle size distribution. Reproduced from Machtle [84] by permission of The Royal Society of Chemistry. 

Fig. 8.18 Sensing curves of a polystyrene microring resonator (Q 5,000) are plotted as a function of glucose mass concentration using (a) the resonant wavelength shift scheme and (b) the intensity variation scheme. Reprinted from Ref. 49 with permission. 2008 American Institute of Physics...

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