抄録
The polyethylene / dialkylphthalate system was found to exibit liquid-liquid phase separation thermodynamically and microporous membrane consisting of independent spherical-like pore could be prepared by gradual cooling of this system. The addition of styrene hydrogenated butadiene di-block copolymer (SHB) to the above system resulted in the very homogeneous pore structure by spinodal decomposition. For the purpose of clarifying the role of SHB on the pore-structure formation, a preferential staining of SHB by rutenium tetraoxide was made and the membrane was observed by TEM. SHB exists as if encapsulating the pore composed of HDPE backbone and works as a polymeric surfactant between polyethylene-rich and -poor phases and hinders the coarsening of the phase-separated structure.
