Grafting polydimethylsiloxane

CAS 64365-23-7 68937-54-2 68938-54-5 Synonyms Dimethylmethyl (polyethylene oxide) siloxane Dimethylsilox-ane/glycol copolymer Polyoxyethylene-grafted polydimethylsiloxane Polysiloxane polyether copolymer Siloxanes and silicones, dimethyl, hydroxy-terminated, ethoxylated propoxylated Classification Silicone glycol surfactant... 

Polyoxyethylene-grafted polydimethylsiloxane. See Dimethicone copolyol Polyoxyethylene monoglycerides. See Ethoxylated mono- and diglycerides Polyoxyethylene monolaurate. See PEG laurate Polyoxyethylene mono (octylphenyl) ether. See Octoxynol Poly (oxyethylene) monooleate. See PEG oleate Polyoxyethylene monostearate. See PEG stearate Polyoxyethylene nonylphenol. See Nonoxynol Poly (oxyethylene) oleate Poly (oxyethylene) oleic acid ester. See PEG oleate... 

Polyoxyethylene glyceryl ether. See Glycereth Polyoxyethylene-grafted polydimethylsiloxane. 

KAW Kawai, T., Teramachi, S., Tanaka, S., and Maeda, S., Comparison of chemical composition distributions of poly(methyl methaciylate)-graft-polydimethylsiloxane by high-performance Uquid chromatography and demixing solvent fractionation, Int J. Polym. Anal. Char., 5, 381, 2000. 

Schunk TC, Long TE. Compositional distribution characterization of poly(methyl methacrylate)-graft-polydimethylsiloxane copolymers. J Chromatogr A 1995 692 221-232. 

While taking these facts into consideration, this section deals with the estimation of Li transport number by the combination of the complex impedance and potentiostatic polarization measurements on the polymer electrolyte sandwiched between two lithium electrodes. As the polymer electrolytes we used three types of amorphous network polymers. The first was the PEO network polymer in which LiC104 was dissolved [91]. The second was the polyelectrolyte-type PEO network polymer, in which Li ions were introduced as counterions of the anion sites fixed to the polymer backbone. The third was the network polymer from PEO-grafted polydimethylsiloxane... 

Surface active agents are important components of foam formulations. They decrease the surface tension of the system and facilitate the dispersion of water in the hydrophobic resin. In addition they can aid nucleation, stabilise the foam and control cell structure. A wide range of such agents, both ionic and non-ionic, has been used at various times but the success of the one-shot process has been due in no small measure to the development of the water-soluble polyether siloxanes. These are either block or graft copolymers of a polydimethylsiloxane with a polyalkylene oxide (the latter usually an ethylene oxide-propylene oxide copolymer). Since these materials are susceptible to hydrolysis they should be used within a few days of mixing with water. 

ESCA analysis showed a similar trend of incomplete surface coverage for the IK systems. Also, no domains were visible in any of the IK styrenic graft systems by TEM. There is an expected trend with respect to solubility parameter, p(t-butyl styrene) (6 s 8.1) has a solubility parameter much closer to that of polydimethylsiloxane (S a 7.3) than does p(p-methyl styrene) which is closer than p(styrene) (S s 9.1). 

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. 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]...

Abstract We review various methods for the photochemical grafting of organic polymers to various substrates including, organic films, membranes, planar gold, silicon wafers, glass, silica gel, silica nanoparticles, and polydimethylsiloxane micro-channels. An emphasis is placed on photoinitiated synthesis of polymer brushes from planar gold and silicon. 

Recently Allbritton and Li coated polydimethylsiloxane (PDMS) microfluidic channels with BP [36]. Upon irradiation in the presence of a monomer solution, they were able to graft poly(acrylic acid) and poly(ethylene glycol) monomethoxyl acrylate to the interior walls of the channels. This is a significant achievement since the device did not require disassembly in order to modify the channel walls. The electrophoretic separation of the modified channels was different from the native channels. This technique holds particular promise for the microfluidic separations commimity. 

Most dispersion polymerizations in C02, including the monomers methyl methacrylate, styrene, and vinyl acetate, have been summarized elsewhere (Canelas and DeSimone, 1997b Kendall et al., 1999) and will not be covered in this chapter. In a dispersion polymerization, the insoluble polymer is sterically stabilized as colloidal polymer particles by the surfactant that is adsorbed or chemically grafted to the particles. Effective surfactants in the dispersion polymerizations include C02-soluble homopolymers, block and random copolymers, and reactive macromonomers. Polymeric surfactants for C02 have been designed by combining C02-soluble (C02-philic) polymers, such as polydimethylsiloxane (PDMS) or PFOA, with C02-insoluble (C02-phobic) polymers, such as hydrophilic or lipophilic polymers (Betts et al., 1996, 1998 Guan and DeSimone, 1994). Several advances in C02-based dispersion polymerizations will be reviewed in the following section. 

The same authors attempted copolymerization of these silicone — type macromonomers with different monomers (e.g. styrene) with the aim of synthesizing graft copolymers. a,ra-Diunsaturated polydimethylsiloxanes were also synthesized by the same method starting from i,m-dichlorodimethylsiloxane oligomers. 

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