Grafting amine groups

In line with these observations, in the second part of the chapter, cold plasma in N2 and hydrogen was used to graft amine groups onto a Pebax membrane surface in order to enhance the overall transport through the surface-modified Pebax membrane. We expect that the amine groups created on the polymer film in a N2/H2 cold plasma gas [27] promote enhanced CO2 sorption at the upstream membrane surface, and therefore enhanced CO2 selectivity in respect of nitrogen. 

GRAFTING OF HINDERED AMINES GROUPS ON EPDM AND POLYOCTENAMER VIA PHOTO-HYDROPEROXIDATION... 

Base catalysis is one of the less-well developed areas of heterogeneous catalysis. We have developed novel bases derived from amines via the one-step process outlined above. A range of supported amines have been prepared and evaluated in a series of reactions We have also investigated the nature of the amine groups attached to the surface in comparison with those formed by grafting onto pre-formed silica. While many workers have studied the use of basic catalysts for the Knoevenagel condensation of aldehydes, with three articles on the use of MCM derivatives[ 12], little has been done on the more demanding condensation of ketones. 

Reaction of AMPS with benzaldehyde results in a rapid (20-30s) formation of the corresponding imine. Such a reaction takes several days in the case of the HMS material. Similarly, the alkylation of the nitrogen with e g. benzyl chloride is far more rapid (by a factor of several hundred) in the case of the grafted material. Thus, the amine groups in the new materials do not appear to display any significant nucleophilicity, despite their similar basic... 

If the diazonium groups result from the diazotation of poly-/>-amino-styrene, the macroradicals will initiate grafting. Contrarily, if >-(N-acetyl) phenylenediamine is diazotized and used as initiator of a first monomer, a polymer is obtained with an acetamino. phenyl end group (-CGH4-NH-Ac). After hydrolysis of this last and diazotation of the free amine group, the polymeric terminal diazonium salt can be used with ferrous ions for the synthesis of block copolymers. 

The grafting from method is also successful in other ring opening polymerizations. For example, -caprolactone polymerization is initiated from polypropylene imine) dendrimers with n=2-16 end-standing amine groups [135]. To be... 

Furthermore, a careful control of the desorption process will be suitable for monitoring the chemical grafting of functionalized oligonucleotides (mainly ODN bearing amine group at its 5 position), a point which will be delineated in the next section. 

In some applications, it is also desirable to graft various molecules bearing OH groups or amine groups to the polysiloxane backbone. An example for a successful introduction of such a molecule has been shown by the grafting of cinchonidine. This molecule is well known to afford enantioselective reduction on metallic surfaces. The aim was first to use such a polymer to stabilize metal nanoparticles in organic solvents as well as to study the catalytic activities of such system. 

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