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:Three-Dimensional Interlocking Interface: Mechanical Nanofastener for HighInterfacial Robustness of Polymer Electrolyte Membrane Fuel Cells Author: SeongminYuk, Min-Ju Choo, Dongyoung Lee, Hwanuk Guim, Tae-Ho Kim, Dai Gil Lee, SungyuChoi, Dong-Hyun Lee, Gisu Doo, Young Taik Hong and Hee-Tak Kim Journal:Advanced Materials, 2017, 29, 1603056 Abstract: A scalable nano-fastener fe...
Title: Metabolic Engineering of Escherichia coli for the Production of 3‑Hydroxypropionic Acid and Malonic Acid through β‑Alanine Route   Author: Chan Woo Song, Je Woong Kim, In Jin Cho, and Sang Yup Lee   Journal: ACS Syn. Biol., 5(11): 1256-1263 (2016. 11)   ABSTRACT: Escherichia coli was metabolically engineered t...
Title: A Low-Voltage Organic Complementary Inverter with High Operation Stability and Flexibility Using an Ultrathin iCVD Polymer Dielectric and a Hybrid Encapsulation LayerAuthor: Hyejeong Seong, Junhwan Choi, Byung Chul Jang, Mincheol Kim, Seunghyup Yoo, Sung-Yool Choi, and Sung Gap Im* Journal: Advanced Electronic Materials, 2016, Vol.2, p.1500385  Abstract: A low-volta...
Title: Synthesis of Ultrathin,Homogeneous Copolymer Dielectrics to Control the Threshold Voltage of OrganicThin-Film Transistors Author: Kwanyong Pak , Hyejeong Seong , Junhwan Choi , Wan Sik Hwang , and Sung Gap Im*Journal: Advanced Functional materials, 2016, Vol.26, p.6574–6582AbstractThis work demonstrates that thresholdvoltage (VT) of organicthin-fi lm transistors (OTFTs) can be contro...
Title : High molecular weight bio furan-based co-polyesters for food packaging applications: synthesis, characterization and solid-state polymerization Authors : Sungmin Hong, Kyung-Deok Min, Byeong-Uk Nam and O Ok Park* Journal : Green Chemistry, 2016, Vol.18, p.5142-5150 AbstractThe goal of this study was to develop ecofriendly bioplastics, which could be applicable in bevera...