Hydrogen-bonded block copolymers

Nucleobase Containing Hydrogen Bonding Block Copolymers... 

Figure 4.8 Synthesis of dicarboximide functional hydrogen bonding block copolymers via ROMP (Dalphond et al. 2002).

Zhao JQ, Pearce EM, Kwei TK, Jeon HS, Kesani PK, Balsam NP. Micelles formed by a model hydrogen-bonding block copolymer. Macromolecules 1995 28 1972-1978. 

Weak physical gels have reversible links formed from temporary associations between chains. These associations have finite lifetimes, breaking and reforming continuously. Examples of weak physical bonds are hydrogen bonds, block copolymer micelles above their glass transition, and ionic associations (Fig. 6.4). Such reversible gels are never truly solids but if the association lifetime is sufficiently tong they can appear to be solids on... 

Chen YL, Guan ZB (2014) Multivalent hydrogen bonding block copolymers self-assemble into strong and tough self-healing materials. Chem Commun 50(74) 10868-10870... 

Binder et al employed two different sets of complementary hydrogen-bonding motifs to cormect phase-separating poly(iso-butylene) and poly(etherketone) in the bulk. The telechelic polymers were synthesized with both sets of hydrogen-bond motifs appended to their respective chain ends, and all polymers were able to yield hydrogen-bonded block copolymers capable of microphase separation. The strongly botmd Hamilton receptor motif (Ka=3 X 1stabilized the material up to 230 ° C, beyond which macrophase separation was observed. 

Similar to core-shell structures reported in hydrogen-bonded block copolymer/homopolymer systems, core-shell micelle formation through electrostatic interaction were also reported. These complexes were generally formed at equimolar ratio of polycations and polyanions. But non-stoichiometric mixtures can also be employed to increase the stability... 

Lefevre N, Fustin C-A, Gohy J-F. Reorganization of hydrogen-bonded block copolymer complexes. Langmuir 2007 23(8) ... 

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