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
스팸방지코드 :
Title: Efficient and Air‐Stable Aqueous‐Processed Organic Solar Cells and Transistors: Impact of Water Addition on Processability and Thin‐Film Morphologies of Electroactive Materials    Author: Changyeon Lee, Hae Rang Lee, Joonhyeong Choi, Youngkwon Kim, Thanh Luan Nguyen, Wonho Lee, Bhoj Gautam, Xiang Liu, Kai Zhang, Fei Huang, Joon Hak Oh, Han Young Woo,...
Title: SERS‐Active‐Charged Microgels for Size‐ and Charge‐Selective Molecular Analysis of Complex Biological Samples Author: Dong Jae Kim, Sung‐Gyu Park, Dong‐Ho Kim,* and Shin‐Hyun Kim* Journal: Small, 2018, 14, 1802520 Abstract: Surface‐enhanced Raman scattering (SERS) provides a dramatic increase of Raman intensity for molecules adsorbed on nanogap‐rich meta...
Title: Aspect Ratio-ControlledSynthesis of Uniform Colloidal Block Copolymer Ellipsoids from Evaporative Emulsions Author: Jae Man Shin, YongJoo Kim, KangHee Ku, Young Jun Lee, Eun Ji Kim, Gi-Ra Yi*, and Bumjoon J. Kim* Journal: Chemistry of Materials, 30, 18, 6277-6288, Inside front cover Abstract: Block copolymers (BCPs)confined in evaporative emulsions can ass...
Title: Fully Dispersed Rh Ensemble Catalyst To Enhance Low-Temperature Activity   Author: Hojin Jeong, Geonhee Lee, Beom-Sik Kim, Junemin Bae, Jeong Woo Han, and Hyunjoo Lee*   Journal: Journal of American Chemical Society, 2018, 140, 9558-9565   Abstract: Minimizing the use of precious metal catalysts is important in many applicati...
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 conjugated–amorphous block copol...