Poly dimethyl siloxane

Solid-phase microextractions also have been developed. In one approach, a fused silica fiber is placed inside a syringe needle. The fiber, which is coated with a thin organic film, such as poly(dimethyl siloxane), is lowered into the sample by depressing a plunger and exposed to the sample for a predetermined time. The fiber is then withdrawn into the needle and transferred to a gas chromatograph for analysis. 

Poly (dimethyl siloxane) offers the least steric hindrance of the polymers listed every other atom along the backbone of the chain is devoid of substituents in this case. 

All the entries above the broken line in Table 2.3 are disubstituted, and those below, with the exception of poly (dimethyl siloxane), are mono-substituted. Those in the former category consistently have larger values of f than the latter. 

Plazek et al.t measured the viscosities of a poly(dimethyl siloxane) sample of = 4.1 X 10 over a range of temperatures using the falling-ball method. Stainless steel (P2 = 7.81 g cm" ) balls of two different diameters,... 

The nature of the solvent is as important as the polymer in determining , as is apparent from the wide range of values for poly (dimethyl siloxane) in different solvents. 

Polyisobutylene 1.15 " Polyethylene butylene 7.7" Polyethylene 7.65 Polyethylene/propylene 7.35 Poly dimethyl siloxane... 

Poly (dimethyl siloxane) obtained by anionic ring-opening polymerization of hexamethylcyclotrisiloxane (D3) can also be end-capped with vinylbenzyl bromide or other electrophiles, such as p. (chlorodimethylsilyl)styrene80). 

Grainger DW, Kim SW, and Feijen J. Poly(dimethyl siloxane)-poly(ethylene oxide)-heparin block copolymers. I Synthesis and characterization. J Biomed Mater Res, 1988, 22, 231-242. 

Table I. Mn Values of Methacrylate Functional Poly(Dimethyl Siloxane) via Spectroscopic and Osmotic Techniques...

Table II. NMR Analysis of Poly(Dimethyl Siloxane) Content in Styrenic Graft and Block Copolymers...

Weight on Methacrylate) the Water Contact Angles of Poly(Methyl -Poly(Dimethyl Siloxane) Graft Copolymers ... 

Figure 10.63 Poly (dimethyl siloxane) attached to cotton by weak polymer-fibre interactions [489]...

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