| 초록 |
We theoretically investigate the phase behavior of blends of mono-end-functionalized polymers (denoted by A) and di-end-functionalized polymer (denoted by B) by using a weak-segregation theory based on Landau formalism. In this model system, polymers can form diblock-like or triblock-like clusters via associations between end-functionalised groups of A- and B-homopolymers. The free energies of various ordered structures including complex phases such as gyroid and double diamond is calculated within the second-harmonic approximation and the possibility of phase coexistences are examined. We find that these functionalised polymer blends exhibit much more variety in morphologies than analogous diblock or triblock copolymer melts. In particular, in some cases that the molecular weight of one-end-functionalized polymer is smaller than that of two-end-functionalized polymer, the squarely arranged cylindrical phase is found to be stable at a relatively narrow region in the phase diagram, which might be due to the interplay between interfacial tension and packing frustration. |
