Synthesis and analysis of Hexagonally packed DNA-like Double helical phase (H2) with A<SUB>1</SUB>BA<SUB>2</SUB>C Tetrablock terpolymer.
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초록
내용
We synthesized and observed the DNA-like double helical structure with linear tetrablock terpolymers polystyrene-block-polyisoprene-block-polystyrene-block-poly(2-vinylpyridine) S1IS22. Sample was synthesized by sequential anionic polymerization. This structure has different kinds of strands (PI and P2VP) twisted together and the rest is filled with PS. We first observed a heterogeneous twisted strand structure that was not found in block copolymer self-assembly and it is a unique property of tetrablock copolymer. This result were good agreement with self-consistent mean field theory(SCFT). This tetrablock terpolymers were characterized by gel permeation chromatography and nuclear magnetic resonance. Morphology of terpolymer was characterized by TEM and small angle X-ray scattering