Dibutylphthalate

Figure 12.11 Coupled SEC-RPLC separation of compound Chemigum mbber stock (a) SEC ti ace (b) RPLC trace of fraction 1, dibutylphthalate (c) RPLC trace of fraction 2, elemental sulfur. Coupled SEC conditions MicroPak TSK 3000H (50 cm) X 2000H (50 cm) X 1000 H (80 cm) columns (8 mm i.d.) eluent, THE at a flow rate of 1 mL/min UV detection at 215 nm (1.0 a.u.f.s.) injection volume, 200 p-L. RPLC conditions MicroPak MCH (25 cm X 2.2 mm i.d.) column flow rate, 0.5 mL/min injection volume, lOpL gradient, acetonitrile-water (20 80 v/v) to 100% acetonitrile at 3% acetonitrile/min UV detection at 254 nm (0.05 a.u.f.s.). Reprinted from Journal of Chromatography, 149, E. L. Jolmson et al., Coupled column cliromatography employing exclusion and a reversed phase. A potential general approach to sequential analysis , pp. 571-585, copyright 1978, with permission from Elsevier Science.

The same name was also given to a singlebase propint, designed for small arms, developed by I.C.I. Ltd (Ref 2). The required ballistics for different types of ammo are obtained by surface treating the proplnt grains with methyl centralite, and in some cases, dibutylphthalate. 

Eaton RW, DW Ribbons (1982) Metabolism of dibutylphthalate and phthalate by Micrococcus sp. strain 12B. J Bacteriol 151 48-57. 

NFS spectra of the molecular glass former ferrocene/dibutylphthalate (FC/DBP) recorded at 170 and 202 K are shown in Fig. 9.12a [31]. It is clear that the pattern of the dynamical beats changes drastically within this relatively narrow temperature range. The analysis of these and other NFS spectra between 100 and 200 K provides/factors, the temperature dependence of which is shown in Fig. 9.12b [31]. Up to about 150 K,/(T) follows the high-temperature approximation of the Debye model (straight line within the log scale in Fig. 9.12b), yielding a Debye tempera-ture 6x) = 41 K. For higher temperatures, a square-root term / v/(r, - T)/T,... 

Table 2.7 lists techniques used to characterise carbon-blacks. Analysis of CB in rubber vulcanisates requires recovery of CB by digestion of the matrix followed by filtration, or by nonoxidative pyrolysis. Dispersion of CB within rubber products is usually assessed by the Cabot dispersion test, or by means of TEM. Kruse [46] has reviewed rubber microscopy, including the determination of the microstructure of CB in rubber compounds and vulcanisates and their qualitative and quantitative determination. Analysis of free CB features measurements of (i) particulate and aggregate size (SEM, TEM, XRD, AFM, STM) (ii) total surface area according to the BET method (ISO 4652), iodine adsorption (ISO 1304) or cetyltrimethylammonium bromide (CTAB) adsorption (ASTM D 3765) and (iii) external surface area, according to the dibutylphthalate (DBP) test (ASTM D 2414). TGA is an excellent technique for the quantification of CB in rubbers. However, it is very limited in being able to distinguish the different types of... 

Figure 12.11 shows the pyrograms of vinyl paints from two monochromes by the Italian artist Piero Manzoni. The two paints are clearly different in composition acetic acid (peak 1) and benzene (peak 2) are present as common markers of the PVAc binder in both cases, but sample (a) contains dibutyl phthalate (peak 6) as external plasticizer. Peak 5 was recognized as bis(2-methylpropyl)-phthalate which is formed from dibutylphthalate isomerization, while butyl acetate (peak 3) and butyl benzoate (peak 4) are secondary products of recombination reactions occurring during the pyrolysis. Sample (b), however,... 

Figure 12.11 Pyrograms of a PVAc paint containing external plasticizers (a), and of a vinyl acetate/VeoVa copolymer (b). Peak assignments 1, acetic acid, 2, benzene, 3, butyl acetate, 4, butyl benzoate, 5, bis(2 methylpropyl) phthalate, 6, dibutylphthalate, 7, branched acrylates ranging from C7 to C9...

DMP, dimethylphthalate DMTP, dimethylterephthalate DMIP, dimethyhsophthalate DIBP, dibutylphthalate DEHP, diethylhexylphthalate DBP, dibutylphthalate... 

Dibutyl phenyl phosphate, 11 494 Dibutylphthalate (DBP), 10 430 Dibutylphthalate number, of silica, 22 371 Dibutyl sebacate, cosmetically useful lipid, 7 833t... 

Polyvinyl chloride was first produced by Ostromislensky in 1912. However its commercial development occurred only when dibutylphthalate was used as plasticiser by Semor in early 1930s. 

Thuren [1] determined phthalates in sediment using solvent extraction (acetonitrile, petroleum ether), clean-up with deactivated Florisil, and quantitative analysis by gas chromatography. The detector response was linear between 0.5 and lOOng. The detection limit (signahnoise ratio 2 1) was O.lng for dimethylphthalate, dibutylphthalate and di(2-ethylhexyl) phthalate, and 0.05ng for benzoylbutylphthalate. Recovery was between 30% and 130% depending on the ester. Low recovery for dimethylphthalate (30%) was probably due to pyrolysis in the detector (detector temperature was 320°C). 

Although fast to bleeding in petrolether and dibutylphthalate, very little bleeding is found in ethanol and methoxypropanol and a slight bleeding occurs in toluene, ethylacetate, paraffin and the solvent mixture according to DIN 16 524. 

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