Dendrimer-based networks

PAMAMOS Dendrimer-Based Networks Containing Hydrophilic and Hydrophobic Nanoscopic Domains... 

Figure 6 Effect of the time of curing at room temperature on the glass temperature (Tg) of the resulting PAMAMOS dendrimer-based network...

Thermal and thermo-oxidative stability of the PAMAMOS dendrimer-based networks is predetermined by the stability of their less stable compositional parts, i.e., the PAMAM dendrimer interior. In nitrogen, thermal degradation occurs in two steps. 

Figure 7 Tapping mode atomic force microscopy image of a PAM AMOS dendrimer-based network cast on mica surface (A), and the height profile associated with the line drawn on the image (B)...

However, when tested with NaCl and methylene blue water solutions, these PAMAMOS dendrimer-based networks behaved completely differently. For example, while permeability was excellent for sodium chloride dissolved in water, the films turned out practically impenetrable for methylene blue. The latter showed strong tendency towards complexation and encapsulation into the hydrophilic PAMAM domains, as manifested by coloration of the resulting samples. 

Figure 8 Scanning electron microscopy image of a cross-cut of a film of PAM AMOS dendrimer-based network. Magnification 190 X (10 kV)...

Furthermore, the absorbed cations could be chemically transformed while entrapped within the encapsulating PAMAM domains of these dendrimer-based networks, which served as confined nanoscopic reactors . For example, reactions of complexed Cu and Ni with H2S led to the formation of corresponding metal sulfides, while reduction of Ag and Au " yielded elemental metals encapsulated inside the dendrimer-network domains. 

The PAMAMOS dendrimer-based networks can be prepared in a variety of different chemical compositions as elastomers, plastomers or coatings, depending on the particularly desired end-application(s). They also contain well defined (in size and shape) hydrophilic PAMAM and oleophilic (hydrophobic) OS nanoscopic domains which are covalently interconnected in a three-dimensional network continuum. These... 

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