Polymer functionalization by hydrogen bonding stickers can improve their bulk properties.
For instance, grafting bis-ureas on poly(isobutene) led to a material (PIBUT) with remarkable adhesive properties in particular on silicone surface (collaboration C. Creton, ESPCI).
Courtois, J. ; Baroudi, I. ; Nouvel, N. ; Degrandi, E. ; Pensec, S. ; Ducouret, G. ; Chaneac, C. ; Bouteiller, L. ; Creton, C., Supramolecular Soft Adhesive Materials. Advanced Functional Materials 2010, 20 (11), 1803-1811.
Using controlled radical polymerization techniques, a large range of supramolecular polyacrylates were obtained. The strength of the self-association could be tuned with the nature of the bisurea used. Finally, a rheology study showed a strong influence of the molar mass of the polymer. Low molar masses yield elastic material due to bis-urea self-association. In contrast for high molar masses, we have shown that the viscoelastic behavior was governed by the entanglements between chains.
Fonteneau, C. ; Pensec, S. ; Bouteiller, L., Versatile synthesis of reversible comb-sahaped supramolecular polymers. Polym. Chem. 2014, 5, 2496-2505.
Callies, X. ; Fonteneau, C. ; Véchambre, C. ; Pensec, S. ;Chenal, J.M. ; Chazeau, L. ; Bouteiller, L . ; Ducouret, G. ; Creton, C. , Linear Rheology of Bis-Urea Functionalized Supramolecular Poly(butylacrylate)s : Part I – Weak Stickers. Polymer in Press.