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Polyethylene analysis

S. Marino, Advances in polyethylene analysis by NMR, available www.progression-systems.com/pdfs/PE%20 paper%202005. pdf accessed 16 December 2009. [Pg.334]

The studies of Shirayama et al. [1] were instrumental in demonstrating the practical application of TREF and encouraged the further development of the technique for polyethylene analysis. This lead directly to the development of a system which was large scale, robust and continuous. This type of system, has... [Pg.7]

C,M, and li, L. (2002) Metal powder substrate-assisted laser desorption/ ionization mass spectrometry for polyethylene analysis. Anal. Chem., 74, 4750-4756,... [Pg.360]

Chen, R.,Yalcin,T.,Wallace,T.W.E., Guttman, CM., Li, L. (2001) Laser desorption ionization and MALDI time-of-flight mass spectrometry for low molecular mass polyethylene analysis. J. Am. Soc. Mass Spectrom., 12, 1186-1192. [Pg.1132]

PL 20 pM gel mixed A 1000-4x10 Ultra high MW polymer distributions Polystyrene standard calibration, polypropylene analysis, high density polyethylene analysis, polybutadiene analysis... [Pg.270]

Tchenio P, Myers A B and Moerner W E 1993 Vibrational analysis of the dispersed fluorescence from single molecules of terrylene in polyethylene Chem. Phys. Lett. 213 325-32... [Pg.2508]

Anhydrous hydrogen fluoride is also available in cylinders, and aqueous hydrogen fluoride, either 50% or 70%, is also shipped in polyethylene bottles and carboys. Typical product specifications and analysis methods are given in Table 4. [Pg.197]

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... 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...
Fig. 7 gives an example of such a comparison between a number of different polymer simulations and an experiment. The data contain a variety of Monte Carlo simulations employing different models, molecular dynamics simulations, as well as experimental results for polyethylene. Within the error bars this universal analysis of the diffusion constant is independent of the chemical species, be they simple computer models or real chemical materials. Thus, on this level, the simplified models are the most suitable models for investigating polymer materials. (For polymers with side branches or more complicated monomers, the situation is not that clear cut.) It also shows that the so-called entanglement length or entanglement molecular mass Mg is the universal scaling variable which allows one to compare different polymeric melts in order to interpret their viscoelastic behavior. [Pg.496]

Figure 4.25 (page 122) shows results obtained on TSK-GEL SW and TSK-GEL PW columns for low molecular weight polyethylene glycol (PEG) oligomers and high molecular weight dextrans. The TSK-GEL G2000PW column successfully resolved components of PEG 200, whereas the TSK-GEL G2000SW column did not (Fig. 4.25A). Therefore, the TSK-GEL G2000PW column would be preferable for this analysis. Figure 4.25 (page 122) shows results obtained on TSK-GEL SW and TSK-GEL PW columns for low molecular weight polyethylene glycol (PEG) oligomers and high molecular weight dextrans. The TSK-GEL G2000PW column successfully resolved components of PEG 200, whereas the TSK-GEL G2000SW column did not (Fig. 4.25A). Therefore, the TSK-GEL G2000PW column would be preferable for this analysis.
Figure 6.21 shows the calibration curves of the SB-800 HQ series using standard pullulan. Because a high molecular weight standard sample is not available, the calibration curves of 805 and 806 are partly estimates (dotted lines). The difference in the conformation between polyethylene oxide (PEO) and pullulan in the solvent causes a shift of the calibration curves of pullulan slightly higher than those of PEO. The OHpak SB-800HQ series is better suited for the analysis of hydrophilic samples than the Asahipak GS/GE series. [Pg.193]

Deionized water can be used as an eluent for the analysis of nonionic polymers such as pullulan and polyethylene glycol. However, in most cases, salt solutions or buffer solutions are used to decrease ionic or other interactions between samples and the stationary phase or to prevent sample association (Eigs. 6.22 and 6.23, pages 196 and 197). [Pg.193]

FIGURE 9.26 Room temperature analysis of polyethylene terephthalate. Columns PSS PEG 100 + 1000. Eluent HFIP + 0.1 /VI NatFat. Temp 2S°C. Detection UV 2S4 nm, Rl. Calibration PSS PET standards (broad). [Pg.299]

In the process of inhibition polypyrocatechin borate interacts with polyethylene macroradicals to form the B—O—C bonds. This is confirmed by the fact that the absorption spectrum of polyethylene inhibited with polypyrocatechin borate revealed the bands in the region of 1350 cm" characteristic for the B—O—C bond. There is no such a band in the spectrum of pure polypyrocatechin borate after heating under the same conditions. Chemical analysis of boron in polyethylene provides support for the IR-spectroscopy data concerning the presence of chemically bonded boron in polyethylene after destruction. [Pg.88]


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See also in sourсe #XX -- [ Pg.276 ]

See also in sourсe #XX -- [ Pg.310 ]




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