Perpendicularly oriented block copolymer thin films induced by neutral star copolymer nanoparticles

Seyoung Kim, Misang Yoo, Julia Baettig, Eun Hye Kang, Jaseung Koo, Youngson Choe, Tae Lim Choi, Anzar Khan, Jeong Gon Son, Joona Bang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


By introducing neutral star copolymers consisting of poly(styrene-r-methyl methacrylate) (PS-r-PMMA) arms, a perpendicular orientation of PS-b-PMMA microdomains in thin films could be achieved without any surface treatment. The star copolymers were synthesized by arm-first method in which short chain arms are crosslinked by employing a multifunctional coupling reagent via atom transfer radical polymerization. To find the optimal neutral composition for the perpendicular orientation, we varied the composition of MMA in PS-r-PMMA arms from 40 mol % to 80 mol %. It was found that the star copolymer having an overall PS and PMMA composition of 59:41 exhibits the well-ordered perpendicular orientation of lamellar structures after thermal annealing. Furthermore, we also prepared the deuterated star copolymers to trace them within PS-b-PMMA films along vertical direction by neutron reflectivity. In this case, it was observed that star copolymers were mainly located at the top surface and bottom interface of the films, thereby effectively neutralizing the surface/interfacial energy differences. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalACS Macro Letters
Issue number1
Publication statusPublished - 2015 Jan 20

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


Dive into the research topics of 'Perpendicularly oriented block copolymer thin films induced by neutral star copolymer nanoparticles'. Together they form a unique fingerprint.

Cite this