Inducing hardening and healability in poly(ethylene--acrylic acid) blending with complementary low molecular weight additives.

The design and synthesis of low molecular weight additives based on self-assembling nitroarylurea units, and their compatibility with poly(ethylene--acrylic acid) copolymers are reported. The self-assembly properties of the low molecular weight additives have been demonstrated in a series of gelation studies. Upon blending at low percentage weights (≤5%) with poly(ethylene--acrylic acid) the additives were capable of increasing the stress and strain to failure when compared to the parent copolymer. By varying the percentage weight of the additive as well as the type of additive the mechanical properties of poly(ethylene--acrylic acid) could be tailored. Finally, the healability characteristics of the blends were improved when compared to the original polymer the introduction of a supramolecular 'network within a network'.