Effect of junction point functionality on the lamellar spacing of symmetric (PS)n(PI)n miktoarm star block copolymers

Yuqing Zhu, Samuel P. Gido*, Maria Moshakou, Hermis Iatrou, Nikos Hadjichristidis, Soojin Park, Taihyun Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


To probe the effect of junction point functionality in miktoarm star block copolymer architecture on chain conformation and morphology, a series of AnBn miktoarm star copolymers where A arms are PS blocks and B arms are PI blocks were investigated. The overall series including a diblock and the star block copolymers can be represented by AnBn where n = 1, 2, 4, and 16. These materials were produced by synthesizing a single batch of living PS arms and a single batch of living PI arms and then linking them together with chlorosilane coupling agents of different functionality. Thus, all PS arms are identical and all PI arms are identical across the entire series of materials. All stars in the series have equal numbers of PS and PI arms, and the volume fractions of all the samples in the series (nearly 0.50 PS by volume) are identical within experimental error. All the materials were found, via small-angle X-ray scattering and transmission electron microscopy, to form lamellar morphologies. A significant increase in lamellar spacing with increasing junction point functionality (n) was found in this series of materials and can be attributed to molecular crowding near the junction point.

Original languageEnglish (US)
Pages (from-to)5719-5724
Number of pages6
Issue number15
StatePublished - Jul 29 2003
Externally publishedYes

ASJC Scopus subject areas

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


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