Poly ureido-pyrimidinone

Fig. 4 Hydrogen-bonded thermoplastic elastomer based on self-complementary interactions of ureido-pyrimidinone (UPy). (a) Poly(ethylene-co-butylene) with OH end groups, (b) Poly(ethyl-ene-co-butylene) functionalized with UPy. (c, d) Lateral intraactions through tt—tt stacking of UPy and hydrogen bonding of urethane linkers, (e) AFM image of nanofibers formed through these lateral interactions. Reprinted with permission friun [90-92]. Copyright 2000, 2006, 2008 Wiley-VCH Verlag GmbH, Wiley Periodieals, Ine., and American Chemical Society...

The relative insensitivity of this class of Ni catalysts to polar functional groups, and especially their low oxophilicity, is another important characteristic. This property has been exploited for the development of novel polymeric materials that might find new applications. For example, 1-hexene has been copolymerized with 6-(2-ureido-4-[lH]-pyrimidinone)hex-l-ene (30) to generate a new poly(olefin) elastomer (equation 7). The dimerization (through H-bonding) of the pyrimidinone moieties forms noncovalent crosslinks that bestow unique properties to the otherwise amorphous poly(l-hexene) matrix. 

Synthesis of 2-ureido-4[lH]-pyrimidinone methyl methacrylate (UPyMA) monomer and poly(methyl methacrylate-co-2-ureido-4[lH]-pyrimidinone methyl methacrylate (P(MMA-co-UPyMA) copolymers. 

Figure 12 Quadruple hydrogen bonding of 2-ureido-4[lH]-pyrimidinones and their incorporation into (a) covalent main-chain polyolefins (b) and poly(alkyl methacrylates). ...

---