| 초록 |
Several hydrogenated substituted polynorbornenes show substantial miscibility with polyethylene (PE), with symmetric block copolymers forming homogeneous melts even above 100 kg/mol. The polymers are synthesized by living ring-opening metathesis polymerization of cyclopentene and a 5-substituted norbornene, then hydrogenated. We characterize the interaction energy density X (proportional to the Flory χ) via the order-disorder transition temperature. Though these are all-hydrocarbon polymers, they do not quantitatively obey regular mixing, but can be described empirically by X = (Δγ)1.5, where γ is a pure-component quantity operationally analogous to a solubility parameter. Incorporating short blocks of hydrogenated poly(norbornylnorbornene), with Tg = 115 °C, effectively doubles the modulus and yield strength of PE, while retaining an easily-processed single-phase melt. |
