Polybutadiene coating

A soluhon explored to definitely eliminate the problem of interachons with free silanol groups was the use of non-silica based stahonary phases. Many studies recently reviewed [9] were conducted on this class of stahonary phases to test their usefulness for UpophiUcity prediction. A few of these phases including polybutadiene-coated alumina [4] and octadecyl-bonded alumina show intereshng results. Conversely, several of them show poor correlahons or correlahons not better than those obtained on ODS stahonary phases between the retenhon parameter and log Pod-... 

Li, J. and Carr, P. W., Retention characteristics of polybutadiene-coated zirconia and comparison to conventional bonded phases, Anal. Chem., 68(17), 2857,... 

Li, J., Hu, Y. and Carr, P.W., Fast separations at elevated temperatures on polybutadiene-coated zirconia reversed-phase material, Anal. Chem., 69(19), 3884, 1997. 

Kendig and Leidheiser (16) electrochemica1ly evaluated thin (9 micron) polybutadiene coatings on steel. They concluded that movement of the corrosion potential in the noble direction was indicative of an increasing cathodic/anodic surface area ratio. Oxygen and water penetrate the coating to produce the cathodic reaction at the metaI/coat ng interface. 

Fourier transform Infrared spectroscopy has been shown to be an excellent tool for surface and Interface studies (.2), In this paper, the application of reflection/absorption Fourier transform Infrared spectroscopy (FTIR-RA) for studying the degradation of amine-cured epoxy and polybutadiene coatings on cold-rolled steel after exposure to a warm, humid environment is reported. 

Figure 3. FTIR-RA spectra of polybutadiene coating on cold-rolled steel before and after exposure to 40 C and 80% RH...

Degradation of Polybutadiene Coating on Cold-Rolled Steel... 

The rate of delamination increases with increase in temperature. The activation energy in the case of polybutadiene coatings on steel is approximately 12 kcal/mole. 

In other work. Fog and Rietz used a polybutadiene-coated TSM resonator to detect ozone in workplace environments [137]. Ozone reacts irreversibly with unsaturated hydrocarbons to form ozonides, which typically react further with moisture to give ketones and hydrogen peroxide. They reported stable operation at a concentration of 20 ppb for up to 4 hours, with a 10% decrease in sensitivity during a 15-minute exposure to 100 ppb of ozone. 

J. Li and P. W. Carr, A study of the efficiency of polybutadiene-coated zirconia as a reversed-phase chromatographic support, Anal. Chem. 69 (1997), 2193-2201. 

J. Dai, X. Yang, and P. Carr, Comparison of the chromatography of octadecyl silane bonded silica and polybutadiene-coated zirconia phases based on a diverse set of cationic drugs, J. Chromatogr. A 1005 (2003), 63-82. 

Y. Xiang, B. Yan, B. Yue, C. V. McNeff, P. W. Carr, and M. L. Lee, Elevated-temperature ultrahigh-pressure liquid chromatography using very small polybutadiene-coated nonporous zirconia particles, /. Chromatogr. A 983 (2003), 83-89. 

In Fig. 11.7 the distribution of drugs belonging to several pharmacological clas.ses on the plane determined by the first two principal components account together for 81.5% of the variability in the retention data measured from 8 HPLC systems I50. The HPLC systems comprised stationary phases such as standard and specially deactivated hydrocarbonaceous silicas, polybutadiene-coated alumina, immobilized artificial membrane and immobilized Oi-acid glycoprotein. Methanol-buffer eluents of varying compositions and pH were used. The clustering of analytes is consistent with their estab-... 

Kaliszan, R. Osmialowski, K. Correlation between chemical structure of non-congeneric solutes and their retention on polybutadiene-coated alumina. J. Chromatogr. 1990, 506, 3-16. 

As reversed-phase high-performance liquid chromatography is the most common mode of HPLC, many efforts have been made by chromatographers to introduce hydrophobic moieties on the zirconia surface. Polybutadiene-coated zirconia (PBD-Zr02) was proven to be an excellent reversed-phase packing material.PBD-Zr02 has excellent pH and thermal stability and is efficient for... 

Sun, L.F. Carr, P.W. Mixed-mode retention of peptides on phosphate-modified polybutadiene-coated zirconia. Anal. Chem. 1995, 67, 2517-2523. 

Hanson, M., Unger, K.K., Schomburg, G. Non-poros polybutadiene-coated silicas as stationary phases in reversed-phase chromatography, J. Chromatogr., 1990, 517, 269. 

A separation of the EPAjg was achieved using a 10 cm X 4.6 mm i.d. polybutadiene-coated zirconia (2.5-/rm particle size) reversed-phase column. Resolution and retention times were compared for this column at 30°C and at 100°C. The separation at 30°C and 1 ml min required 70 min while at 100°C and 3 ml min it was achieved in less than 4 min. Two isomeric pairs (B[a]A/CHY and B[b]F/B[k]F) were not resolved at either temperature, but peak symmetry was superior at the higher temperature and flow rate. ACE and FLU were also not resolved under the fast conditions. 

Fig. 1.8 Fe2p3/2 spectrum acquired at the interface between an iron substrate and a polybutadiene coating. The Fe(ll) components result from the reduction of the iron oxide by the polymer.

Polybutadiene coating, 127 Polyethyleneimine coating, 128 Polymer analysis, 131-132,147-163 Polymeric packings, 107-109,122-126,204-206 divinylbenzene-based packings, 122-124, 204-205... 

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