Synthesis and Small-Angle X-Ray Scattering Investigations of Ureido- Pyrimidone Hydrogen Bonding Star and Linear Poly(ethylene-co-propylene)s

摘要

Copolymers of poly(ethylene) and poly(propylene) having ureido- pyrimidone (UPy) hydrogen bonding moieties were synthesized and their bulk morphological behavior characterized. Anionic polymerization techniques allowed the synthesis of copolymers having well-defined linear, telechelic, and star architectures in which the UPy functional groups were located at the ends of the polymer chains. Small-angle x-ray scattering was used to characterize the bulk morphologies of these materials, which were found to be microphase separated, with the hydrogen bonding UPy moieties segregating from the copolymer bulk. The characteristic length scale observed varied substantially, depending on the molecular architecture, and is most likely correlated with the separation between microphase separated UPy-rich domains.