Synthesis and Thermo-reversibility of Poly (ethylene-co-vinyl alcohol)-g-Ureidopyrimidinone Groups

Supramolecular polymers are the array of small or macro molecules which are connected together by the non-covalent reversible interactions [1]. Hydrogen bonds, especiallymultiple ones are more interested because of their relative strength and high directionality. Meijer and Sijbesma groupintroduced ureidopyrimidinone (UPy) as a suitable group withthe capability to create quadruple hydrogen bonds [2-4]. UPy is a self-complementary group via self-assembly of quadruplehydrogen bonds. Dimerization of UPy in chloroform is very stable and has good strength. Its dimerization constant at 298K is 6×107 M-1 [4]. Functionalization of low molecular weight polymers with UPy change all properties of them because ofthe self-assembly of UPy [4]. In this research we designed asupramolecular polymer based on poly (ethylene-co-vinyl alcohol) (EVOH) and self-assembly of UPy groups by graftfunctionalizationof (EVOH) with UPy. For this purpose UPy- Synthon which has UPy and isocyanate end groups was utilized and then molecular structure of EVOH-UPy and its thermo-reversibility was studied