PS-polydimethylsiloxane

Fig. 10 Plots of Le/f-cw vs. dimensionless graft density a (1) PS brushes prepared by adsorption of PS-polydimethylsiloxane block copolymers (Mw,ps = 60000) and 0 (Mw,ps = 169000) [21,22]. (2) PEO brushes prepared by adsorption of PEO-PS block copolymers A (Mw.peo = 30800) and V (Mw.peo = 19600) [201]. (3) PMMA brushes prepared by surface-initiated ATRP (M = 31 300 267400). Data reprocessed from [116,117]...

PS-polydimethylsiloxane (PS-PDMS), polyimides containing thermally labile blocks such as poly(methyl methacrylate) (PMMA) or poly(propylene oxide) (PPO), poly(f-butylacrylate)-b-poly(2-cinnamoylethyl methacrylate) (PtBAPCEMA), poly-styrene-b-poly(methyl methacrylate) (PS-b-PMMA), PS-poly(perfluorooctylethyl methacrylate) (PS-PFMA), PS-polylactide (PS-PLA), and PS-b-poly-4-vinylpyridine (PS-PVP). 

GCB = graphitized carbon black SPME = solid-phase microextraction PDMS = polydimethylsiloxane PS = polystyrene DVB = divinylbenzene SDB = styrene-divinylbenzene. 

In this paper we describe methods in which polystyrene (PS) and polydimethylsiloxane (PDMS) have been successfully grafted to silica particles, avoiding the dry stage. 

Fig. 23. Variation of surface layer thickness with molecular weight of the stabilizing polydimethylsiloxane (PDMS) chain. Hydrodynamic thickness <5109) PMMA particles (O), PS particles ( ), micellar dispersions (A) from viscosity data x, thickness h from surface coverage data of PMMA particles assuming a prolate ellipsoid model for the...

Chen, Gardella and Kumler106 have studied a series of polydimethylsiloxane-polystyrene block copolymers and examined the surface composition by ATR-FTIR and XPS. For AB-type PS-PDMS diblock copolymers (26) with siloxane block molecular weights of between 38,000 and 99,000, the surface was found to be exclusively polydimethylsiloxane down to a depth of 10 nm by XPS. ATR-FTIR, which samples... 

Koberstein and coworkers121 have examined the effects of a polydimethylsiloxane-polystyrene (PDMS-PS) block copolymer on the interfacial tensions of blends of PDMS and polystyrene. As little as 0.002 wt% of the copolymer, added to the siloxane phase, was sufficient to lower the interfacial tension by 82% in the case of a blend of polystyrene (Afn = 4,000) and PDMS (Mn = 4,500). No further reduction in interfacial tension was observed at higher copolymer levels due to micelle formation. Riess122 has polymerized styrene in the presence of a silicon oil and a polydimethylsiloxane-polystyrene block copolymer to obtain a polystyrene in which 0.1-1 pm droplets of silicone oil are dispersed. This material displayed a lowered coefficient of kinetic friction on steel compared to pure polystyrene. 

PE, polyethylene PS, polystyrene PDMS, polydimethylsiloxane PIB, polyisobutylene PMMA, (atactic) polymethylmethacrylate l,4PBd, 1.4-polybutadiene 1,4PI, 1,4-polyisoprene. 

A, air H, water W, waste Al, aliphatic amine AA, aromatic amine PAA, polyaromatic amine ABDAC, alkylbenzyldimethylammonium chloride AME, alkylamine ethoxylates T, tertiary amine PE, polyethylene PS/DVB, polystyrene/divinylbenzene PDMS, polydimethylsiloxane PA, polyacrylate PAB, polyacrilonitrilbutadiene. 

Several SP materials have been used for the extraction of FRs from aqueous samples, plasma and milk (Table 31.7). Similar materials have been used for all FRs. Typical SP materials include Ci8 and Cg bonded to porous silica, highly cross-linked poly(styrene divinylbenzene) (PS-DVB), and graphitized carbon black (GCB). It is also possible to use XAD-2 resin for extraction of various FRs, pesticides, and plastic additives from large volumes of water (100 1). The analytes can then be either eluted from the resin by acetone hexane mixture, or Soxhlet extracted with acetone and hexane. For a specific determination of diphenyl phosphate in water and urine, molecularly imprinted polymers have been used in the solid phase extraction. The imprinted polymer was prepared using 2-vinylpyridine as the functional monomer, ethylene glycol dimethacrylate as the cross linker, and a structural analog of the analyte as the template molecule. Elution was done with methanol triethylamine as solvent. Also solid phase microextraction (SPME) has been applied in the analysis of PBDEs in water samples. The extraction has been done from a headspace of a heated water sample (100°C) using polydimethylsiloxane (PDMS) or polyacryl (PA) as the fiber material. ... 

Surface tension vs. temperature for PS and PTHF are shown in Figure 15. The data of Gains and Bender (17) on PS surface tensions (yGps) agree well with ours. However, our value for the surface tension of PTHF (yoPthf) is about 4.5 dynes/cm higher than Roe s value (18). The reason for this discrepancy is not clear. The y0i thf is always smaller than the yoPS by Ay = 3 dynes/cm, which is much smaller than the surface tension difference between the blocks of PS and polydimethylsiloxane. The time-dependent surface tensions of four blends (ST-PS, ST-PTHF, PS-PTHF, and PTHF-PS) were measured. To prepare the blends, the block or homopolymers were added in small amounts (0.3-1 wt %) to the homo-PS or PTHF. The mixture was completely dissolved in benzene, the solutions were quickly frozen by a dry ice-acetone mixture, and the samples were freeze dried. 

For the proposed technique community verification, namely, the equation (29), the authors [24] used the literary data for polymer-solvent 16 pairs in reference to polymers of different kinds polyearbonate (PC), poly(methyl methacrylate) (PMMA), poly(vinyl ehloride) (PVC), polydimethylsiloxane (PDMS), polyarylate (PAr) and polystirene (PS) [5, 17, 18, 20]. The solubility parameters 6 of the indieated polymers is accepted according to the data [16, 32]. The eomparison of ealeulated according to the Eqs. (4) and (29) Devalues for these polymer-solvent pairs... 

Living anionic ROP of strained silicon-bridged [l]ferrocenophanes (Section 3.3.3) provides an excellent route to PFS block copolymers with controlled block lengths and narrow polydispersities (PDI<1.1) [82-84]. Diblock, triblock, and more complex architectures are now known for a wide variety of organic, inorganic, or even other polyferrocene coblocks. The prototypical materials prepared in the mid-1990s were the diblock copolymers polyferrocenylsUane-h-polydimethylsiloxane (PFS-fo-PDMS) 3.52 and polystyrene-b-polyferrocenylsUane (PS-i -PFS) 3.54 83j. As shown in Scheme 3.4, initial anionic polymerization of monomer 3.21... 

PCP = polychloroprene, PDMS = polydimethylsiloxane, PE = polyethylene, B-PE = branched polyethylene, L-PE = linear polyethylene, PEO = poly(ethylene oxide), PE VAc = poly(ethylene-co-vinyl acetate), PIB = polyisobutylene, PMMA = poly(methyl methacrylate), PnBMA = poly(n-butyl methacrylate), PiBMA = poly(isobutyl methacrylate), PtBMA = poly(t-butyl methacrylate), PP = polypropylene, PS = polystyrene, PTMO = poly(tetramethylene oxide) or polytetrahydrofuran, PVAc = poly(vinyl acetate). 

The obtained patterned polymer surfaces can also be replicated by metal thermal evaporation to produce nanostructured metallic films with holes or asperities of controlled size, as illustrated in Fig. 11.10. After deposition of a sufficiently thick metal layer, the polymer layer can be cleaved or dissolved away. This procedure allows an efficient and precise control of the metallic surface structure, with possible applications in materials science and photonics. The roughness of polydimethylsiloxane (PDMS) surfaces can be tuned by this technique if the PDMS is treated while cross-linking, which may be of interest for microfluidic applications. We have also observed that substrates of poly(methyl methacrylate) (PMMA), PS in the form of colloidal spheres and bulk, and semiciystalline films of polyethylene (PE) are prrMie to be structured by this technique, evidencing the versatility and potential for its widespread use. It may find applications in many different scientific and technological fields like nanoUthography, microfluidics, or flexible electronics. 

Tubingai HSi. See Polydimethylsiloxane Tubingai LM. See Silicone Tubingai MUG. See Polysiloxane Tubingai SKi. See Silicone Tubingai UGS. See Silicone elastomer Tubiscreen EX-V, Tubiscreen FAT. See Acrylates copolymer Tubiscreen KAT. See Silicone emulsion Tubiscreen MET. See Acrylates copolymer Tubiscreen SE, Tubisoft PS Tubisoft SEM. See Polysiloxane... 

Poly sty rene-polydimethylsiloxane block copolymer PS-PDMS (polysimethylsiloxane) blend Four 30 cm 10 pm packings (Polymer Laboratories 10, 105, 1Q4 103 C,H,C1, (tetrachloroethylene) quoted pore size concentration 5 x 10"3 g/cm 3 or less RI, FALLS (dual detector) Compositional heterogeneity correlation with MWD 54... 

We compare our results with those presented previously by other authors. As we mentioned above, many results cannot be compared in principle since the measurements were done using different techniques and quoted errors are often of opposite sign [30] or at different experimental conditions. Data on. potential for polydimethylsiloxane (PDMS), PC, PET, PMMA, PE, PS, polyvinylchloride PVC, PTFE obtained by many authors and by different techniques were summarized in [31]. Values of. potential for PC and PMMA, -70.0 mV and... 

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