Department of Chemical and Biomolecular Engineering
Korea Advanced Institute of Science and Technology

Recent Achievements


[Outside front cover] Domain Structures of Poly(3-dodecylthiophene)-Based Block Copolymers Depend on Regioregularity

Title: Domain Structures of Poly(3-dodecylthiophene)-Based Block Copolymers Depend onRegioregularity


Author: Jin-Seong Kim, Junghun Han, Youngkwon Kim, Hyeonjung Park,Jonathan P. Coote Gila E Stein*, and Bumjoon J. Kim*


Journal: Macromolecules 51, 11, 4077-4084, Outside frontcover


Abstract: Microphase-separation behavior of conjugatedamorphous block copolymers (BCPs) isdriven by a complex interplay between FloryHuggins interaction (χ), liquid crystalline (LC) interaction, and crystallization. Herein,in order to elucidate the influence of LC interaction on the morphology of theBCPs, we report the effects of regioregularity (RR) on the microphaseseparation and molecular packing structures ofpoly(3-dodecylthiophene)-block-poly(2-vinylpyridine) (P3DDT-b-P2VP). Todecouple the effect of LC interactions from crystallization kinetics, weinvestigate the morphological behavior of the P3DDT-b-P2VP at above the meltingtemperature of P3DDT (160 °C).Both electron microscopy and X-ray scattering show an abrupt reduction in thedomain spacing of both lamellar and cylindrical phases as the RR of P3DDT blockincreases. Specifically, lower RR (i.e., 85, 79, and 70%) BCPs have largerdomain spacings than high RR (94%) by 50% (lamellar) or 80% (cylindrical), eventhough the overall molecular weights and P2VP volume fractions were similar foreach RR. We propose that the RR-driven transition in domain spacing is causedby a change in P3DDT conformations and interchain interactions. When RR is low,the system assembles into a typical bilayer structure like other semiflexibleand flexible block copolymer systems. When RR is high, the less flexible P3DDTchains are extended, driving their assembly into an LC monolayer.Significantly, this study demonstrates that tunable RR provides a simple routeto manipulate melt state self-assembly of conjugatedamorphous materials. 


첨부파일 다운로드




  • 페이스북 공유
  • 트위터 공유
  • Google+ 공유
  • 인쇄하기
Title: Stimuli-Responsive, Shape-Transforming Nanostructured Particles Author: Junhyuk Lee, Kang Hee Ku, Mingoo Kim, Jae Man Shin, Junghun Han, Chan Ho Park, Gi-Ra Yi, Se Gyu Jang, Bumjoon J. Kim*   Journal: Advanced Materials, 2017, Vol.29, 1700608 Abstract Dynamic, temperature-driven transformation of the shap...
Title:  [Frontispiece] Structural Color Palettes of Core-Shell Photonic InkCapsules containing Cholesteric Liquid CrystalsAuthor: Sang Seok Lee, HyeonJin Seo, Yun Ho Kim,* and Shin-Hyun Kim*Journal: AdvancedMaterials, 2017, Vol.29, 1606894AbstractPhotonicmicrocapsules with onion-like topology are microfluidically designed to have cholesteric liquid crystals with oppositehandedness in th...
Title:  [Front cover] Selective Coloration of Melanin Nanospheres throughResonant Mie ScatteringAuthor: Soojeong Cho, Tae SoupShim, Ju Hyeon Kim, Dong-Hyun Kim, and Shin-Hyun Kim*Journal: Advanced Materials,2017, Vol.29, 1700256AbstractBlack melanin inks are preparedto selectively exhibit colors under strong light, inspired by human hair. Highabsorbance of melanin suppresses multiple sca...
Title:  [Inside Front Cover] An Ultrasensitive, Visco-Poroelastic Artificial Mechanotransducer Skin Inspired by Piezo2 Protein in Mammalian Merkel Cells  Author: Ming Liang Jin†, Sangsik Park†, Younghoon Lee, Ji Hye Lee, Junho Chung, Joo Sung Kim, Jong-Seon Kim, So Young Kim, Eunsong Jee, Dae Woo Kim, Jae Woo Chung,Seung Geol Lee, Dukhyun Choi, Hee-Tae Jung* ...
Title:  A simple and eco-friendly one-pot synthesis of nuclease-resistant DNA-inorganic hybrid nanoflowers   Author: Ki Soo Park, Bhagwan S Batule, Minsoo Chung, Kyoung Suk Kang, Tae Jung Park, Moon Il Kim and Hyun Gyu Park*   Journal: Journal of Material Chemistry B, 2017, 5, 2231-2234   Abstract: A simple and eco-friendly method has b...