Hydrogen-bonding system, blocking

Lehn, which was obtained from a dynamic library of hydrogen-bonding building blocks [101]. This system involved the equilibration between different products resulting from the condensation of 5,5-dimethyl-1,3-cyclohexanedione (74) and 2-hydrazinopyridine (75) (see Scheme 38). 

Fig. 65 Block copolymers with two different hydrogen-bonding systems for the investigation of selP-sorting-phenomena... 

Figure 3.5 Attachment of complex hydrogen-bonding systems to bis-telechelic PIB prepared by LCCR (Reprinted with permission from W.H. Binder, MJ. Kunz, C. Kluger et aL, Synthesis and analysis of telechelic polyisobutylenes for hydrogen-bonded supramolecular pseudo-block copolymers, Macromolecules, 37, 5, 1749-1759, 2004. 2004 American Chemical Society.)...

IPEC or hydrogen-bonded complexes may form not only between mutually interacting polymer blocks but also between a polymer block and low-MW molecules. Complexes between surfactants and block copolymers have been investigated for the formation of micelles. As illustrated by the work of Ikkala and coworkers [313], one of the major interests of these systems is that they combine two different-length scales of supramolecular organizations, i.e., the nanometer-scale organization of the (liquid) crystalline surfactant molecules and the ten-nanometer scale relative to block copolymers. This gives rise to the so-called hierarchical systems. The field of (block)... 

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