Homo-monolayers of dendritic polymers

In respect to thin films of dendritic polymers, many investigators have fabricated different types of films such as multilayers of amine-terminated PAMAM dendrimers on a silicon wafer [34], covalent attachment of amine-terminated PAMAM dendrimers [35] and poly(iminopropane-l,3-diyl) dendrimers [36] on thiol SAMs, self-assembled composite multilayer films from amine- and 

Langmuir films prepared at air/water interface are transferred on solid substrates and LB firms are constructed. The morphologies of the LB films and their molecular arrangements depend on the characters of hydrophilic and hydrophobic moieties of amphiphiles and the affinity of the moieties to the substrates. Transition of molecular arrangement in LB films of third generation amphiphilic PAMAM dendrimers with dodecyl terminal groups was elucidated [77]. The LB films were transferred by horizontal lifting onto hydrophobic silicon wafers and were devoted to their structural characterization. Since silicon wafers are ahead treated (that is, oxidized) by an aqueous solution of 

The films consisting of poly(benzylether) dendrons are comparably different from those of poly(phenylene sulfide) dendrons. Second generation poly(benzylether) dendrons with an amine-focal point form uniform films after adsorption at room temperature, and the thermo-annealing results only in the increased roughness of the surface (Fig. 3(b)) [82]. SAMs were also 

Dendrons attached as side chains on linear polymer chains behave different from free dendrimers and dendrons. Block copolymers, poly(3,5-bis(3,5-bis (benzyloxy)benzyloxy)-benzyl methacrylate-random-methacrylic acid)-block-poly(2-perfluorooctylethyl acrylate), possess poly(benzylether) dendrons and perfluorinated alkyl chains in their side chains (Fig. 4) [85], While an LB film of a copolymer with a medium substitution fraction of poly(benzylether) dendron side chain in poly(methacrylic acid) displays flat surface, a copolymer with high fraction of poly(benzylether) dendron side chains produces the zone texture. Dendron rich blocks are hydrophobic and oleophilic but perfluorinated blocks are solvophobic. Therefore, in this case, the solvophobicity-to-solvophilicity balance must be considered. As a result, copolymers with medium fraction of dendron are laid on solid substrate, but dendron blocks of copolymers with high fraction prefer to arrange at air side of air/ water interface and the fluorocarbon blocks are enforced to exist close to water subphase, resulting in the zone texture [86]. These situations of molecular arrangements at air/water interface are kept even after transfer on solid substrate. By contrast, when perfluorooctadecanoic acids are mixed with block copolymers with high dendron fraction, the flat monolayers are visualized as terrace [87], The monolayers are hierarchized into carboxyl, per-fluoroalkyl, and dendron layers, that is, hydrophilic, solvophobic, and oleophilic layers. In this case, perfluorooctadecanoic acids play a role for ordering of block copolymers. 

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