Organosilanes polymeric

Moleeules that are normally unreactive can be readily polymerized in such a process. Examples include organie gases such as ethane and various organosilanes. Monomers such as hexamethyldisiloxane can be readily polymerized to fonn tightly adherent films having a silica-like structure ... 

Further studies quickly revealed that the rapid dehydrogenative coupling of primary organosilanes to oligomers and the slower coupling of secondary silanes to dimers can be effected under ambient conditions with compounds of the type CP2MR2 (M = Ti, R = alkyl M = Zr, R = alkyl or H)(11,12,13). None of the other metallocenes, metallocene alkyls, or metallocene hydrides of groups 4, 5 or 6 have shown any measurable activity for polymerization... 

The polymerization of primary organosilanes proceeds according to Equation 2. The rate of polymerization is strongly dependent on the... 

In order to investigate the phase transition in the monolayer state, the temperature dependence of the Jt-A isotherm was measured at pH 2. The molecular area at 20 mN rn 1, which is the pressure for the LB transfer of the polymerized monolayer, is plotted as a function of temperature (Figure 2.6). Thermal expansion obviously changes at around 45 °C, indicating that the polymerized monolayer forms a disordered phase above this temperature. The observed temperature (45 °C) can be regarded as the phase transition point from the crystalline phase to the liquid crystalline phase of the polymerized organosilane monolayer. 

In contrast, hydrolyzed silane compounds, presumably adsorbed as oligomeric films, confer corrosion resistance in both hydrating and Cl environments. These inhibitors can also couple with applied epoxy primer or adhesive formulations to further protect the metal against corrosion by strengthening the metal-epoxide bond. The organosilanes do not appear to affect the curing process, e.g., % crosslinking, of the polymeric epoxy systems. 

Different types of nucleic acids or their analogues (cDNA, oligonucleotides or peptide nucleic acids), supports (silica, gold, polymeric membranes and gels), surface activation chemistries (organosilanes, thiols) and patterning tools can be used for these purposes and will be described in this review. 

Plasma polymerized organosilanes as interfacial modifiers in polymer-metal systems... 

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