Methyl phenyl polysiloxane

The OFRR interior surface is then coated with various polymers, such as moderately polar methyl phenyl polysiloxane (OV-17) or highly polar polyethylene glycol (PEG), for the detection of different types of chemical vapors. The coating procedures are adapted from well-developed static coating procedures for GC... 

The condensation of 2-amino-6-methylpyridine and EMME was carried out in methyl-phenyl-polysiloxanes at 90-100°C to give high-purity (99%) diethyl A-(6-methyl-2-pyridyl)aminomethylenemalonate in 97% yield (84GEP3308089). 3-Amino-5-(pyridyl)-2-(17/)-pyridones were reacted with dialkyl alkoxymethylenemalonates in boiling ethanol for 6.0-6.5 h to... 

CA 60, 3944(1964) [Friction and spark sensitivity of igniter compns contg Zr pdr and oxidizers (such as Fe oxides), is decreased in controlled manner by varying the thickness of a coating of an organo-polysiloxane (such as dimethyl- or methyl-phenyl-polysiloxane, used in quantities 0.5 to 5.0% by wt) on the Zr particles. 

Benzing, R.J., McConnell, B.D. and Clow, W.L., A Methyl Phenyl Polysiloxane Bonded Lubricating Film, ASLE Inti. Conf. on Solid Lubricants, Denver, Colorado, (24-27 Aug. 1971), ASLE SP-3. 

Abil AV 8853, 20-1000 EINECS 218-320-6 Emalex MTS-30E 1,1,5,5,5-Hexamethyl-3-phenyl-3-( trimethyl-silyl)oxy)trisiloxane Methyl phenyl polysiloxane Phenyl trimethicone Phenyl trimethyl siloxane Phenyl-tris(trimethylslloxyl)silarie Polyphenylmethyl... 

Synonyms Methyl phenyl polysiloxane Phenyl methyl polysiloxane ... 

Methylphenyl) phenylmethanone. See 2-Methylbenzophenone Methyl phenyl polysiloxane. See Phenyl methicone Phenyl dimethicone Phenyl trimethicone... 

Synonyms Methyl phenyl polysiloxane Phenylmethyl polysiloxane Polymethylphenyl siloxane Polyphenylmethyl siloxane... 

The methyl and phenyl groups of methyl phenyl polysiloxanes were determined as methane and benzene by alkaline pyrolysis gas chromatography [690]. Fig. 5.9 shows how this determination is performed. 

The high polymeric substance called silicone (the name was suggested by Kipping), which contains a silicon-oxygen skeleton, is a valuable synthetic material. It was developed at General Electric Co. the method was the hydrolysis of certain dimethyldichlorosilane-trimethylchlorosilane mixtures which had first been synthesized by E. G. Rochow in a direct process (see Chapter 2). Shortly thereafter, diphenyl polysiloxanes and methyl phenyl polysiloxanes were joined by dimeth-ylpolysiloxanes as another class of silicones. 

Figure 2.6 Reagents used for the deactivation of silanol groups on glass surfaces. A - disilazanes, B > cyclic siloxanes, and C -silicon hydride polysiloxanes in which R is usually methyl, phenyl, 3,3,3-trifluoropropyl, 3-cyanopropyl, or some combination of these groups. The lover portion of the figure provides a view of the surface of fused silica with adsorbed water (D), fused silica surface after deactivation with a trimethylsilylating reagent (E), and fused silica surface after treatment with a silicon hydride polysiloxane (F).

Cyanopropyl—methil 50% phenyhnethyl polysiloxane 95% Dimethyl—5% phenyl polysiloxane 14%-Cyanopropyl-phenyl)-methylpolysiloxane (5%-Phenyl)-methylpolysiloxane 95% Dimethyl-5% phenyl polysiloxane Bwcyanopropyl phenyl polysiloxane >75% bwcyanopropy 1 polysiloxane 35% Heptakis(6-0-tert-butyldimethylsilyl-2,3-di0-methyl)-b-cyclodestrine in OV-1701 95% Dimethyl-5% phenyl polysiloxane 14% Cyanopropyl 1% vinyl 85% methyl polysiloxane... 

Stationary phases in capillary SFC [30] are usually based on a polysiloxane backbone, cross-linked by means of a free-radical initiator, and methyl, phenyl, octyl, biphenyl, and cyanopropyl substituents are incorporated into them. These polysiloxane phases exhibit wide ranges between their glass transition and decomposition temperatures, and this feature sets them apart from most high molecular-mass polymers, as they allow useful operating conditions for chromatography. Polysiloxanes can be tailor-made for specific... 

Table 6.4 lists the most commonly used liquid phases for both packed and capillary columns. Basically, there are two types of liquid phases in use today. One is siloxane polymers, of which OV-1, SE-30, DB-1 (100% methyl polysiloxane) and OV-17, OV-275, DB-1701, DB-710 (mixtures of methyl, phenyl, and cyano) polysiloxanes are the most popular. The other common liquid phase is a polyethylene glycol (Carbowax 20M, Superox and DB-wax ). 

High-resolution gas chromatography (HRGC) has been widely applied for the determination of PCB contents in water samples [112]. PCBs can be separated on a 30-50 m fused silica capillary column with various chemically bonded stationary phases. Table 20.6 shows combinations of column lengths, stationary phases, oven temperature programs, and detectors. Polysiloxane (95% dimethyl-5% phenyl) is the most widely used stationary phase, although 5% diphenyl polydimethylsiloxane, 7% methyl-7% cyanopropyl-phenyl polysiloxane, 95% dimethyl 5% phenyl polysiloxane, 50% phenyl-methyl-polysiloxane are also used. 

Branched polysiloxanes are more useful as binders for coatings. The branching is introduced by the use of T units in the composition. The organic substitution may be methyl, phenyl or a mixture of both (Figure 2.70). Properties of the final resins are largely governed by the R Si ratio (composition of M, D and T units), and methyl and phenyl content. 

Figure 3.4 Two-dimensional separation of dimethylnaphthalenes in crude oil using a 50 m methyl (95%)/phenyl (5%) polysiloxane primary column and a 50 m methyl (50%)/phenyl (25%)/cyanopropyl (25%) polysiloxane secondary column. The top trace indicates the primary separation monitor, while the following chromatograms indicate individual heart-cut secondary analysis. Reproduced from R.G. Schafer and J. Holtkemerr, Anal. Chim. Acta. 1992, 260, 107 (20).

---