Polymers Connected with Trivalent Hydrogen Bonds

Polymers Connected with Trivalent Hydrogen Bonds 

Trivalent hydrogen-bonding systems have been used very extensively for guiding and influencing the structuring of polymers. As mentioned in Sect. 1, Fig. 5, the most important triple-hydrogen bonds derive from 2,6-diamino-pyridines, 2,6-diamino-1,3,5-triazines and their complexes with flavine- and 

An important contribution towards the effect of triple hydrogen bonds on polymer behavior was demonstrated by Meijer et al. [83] in early 1995. 

Long et al. [87] have studied the association of PS-polymers bearing adenine- and thymine endgroups, prepared via Michael-type addition. The association was followed by H-NMR spectroscopy, relying on the temperature dependency of the imide-protons and revealed strong effects in solution. The formation of 1 1 complexes was proven and extended to other polymers such as poly(acrylates) and their respective melt viscosities [88]. Similar results have been reported for PS-b-Pl [89] and polyisoprenes [90]. hi 

Binder et al. [92,93] have reported on the formation of poly(etherketone) poly(isobutylene) networks formed by the respective endgroup-modified telechelics. The relevant interactions investigated relied on the 2,6-diamino-1,3,5-triazine/thymine and the much weaker cytosine/2,6-diamino-1,3,5-triazine-modified polymers (Fig. 18). In addition to the pure hydrogenbonding interaction, phase-separation energies resulting from the strongly microphase separating PEK- and PIB polymers were expected. The association behavior was followed in solution via NMR-association experiments. 

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Polymers Connected with Trivalent Hydrogen Bonds... 

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