Fibers and Polymers

  • 제4권1호
  • /
  • Pages.15-19
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  • 2003
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  • 1229-9197(pISSN)
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  • 1875-0052(eISSN)
한국섬유공학회 (The Korean Fiber Society)
권호 표지

A Molecular Dynamics Simulation on the Self-assembly of ABC Triblock Copolymers.3. Effects of Block Composition in Asymmetric Triblock Copolymers

  • Ko, Min-Jae (Hyperstructured Organic Materials Research Center and School of Materials Science Engineering, Seoul National University) ;
  • Kim, Seung-Hyun (Hyperstructured Organic Materials Research Center and School of Materials Science Engineering, Seoul National University) ;
  • Jo, Won-Ho (Hyperstructured Organic Materials Research Center and School of Materials Science Engineering, Seoul National University)
  • 발행 : 2003.03.01
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초록

The self-assembly of asymmetric ABC triblock copolymers in the ordered structure is investigated using an isothermal-isobaric molecular dynamics simulation. Unlike symmetric A BC triblock copolymers, more fascinating mophologies are observed in asymmetric ones because of a larger difference of incompatibility between the components. Various modes of self-assembly in assymmetric ABC triblock copolymers are also observed depending on the block composition. When the composition of block A Is changed from 0.125: to 0.25 at the same $f_B$ : 0.25, the morphological transition from the “cylinder in cylinder” to “cylinders at cylinder” structure is observed in the simulation. In the case of ABC triblocks with $f_B$=0.5, a lamellar-type structure is changed to a cylinder-type structure with increasing the length of block A. When the midblock length increases further to $f_B$=0.625, the “spheres on cylinder” structure is observed in both the $A_{10}$$B_{50}$$C_{20}$ and $A_{20}$$B_{50}$$C_{10}$ triblocks. From these results, the phase diagram of ABC triblock copolymers can be constructed.

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