Jeon, Seung-Yeol Jeon, Hyeonyeol Park, Tae Joon Kang, Min Kwan Cho, Byoung-Ki Hwang, Seung Sang Hur, Kahyun 2024-01-19T19:32:33Z 2024-01-19T19:32:33Z 2021-09-02 2019-08 1022-1352 https://pubs.kist.re.kr/handle/201004/119734 Some polymer mixture systems become immiscible above a specific temperature, the so-called lower critical solution temperature (LCST). In this work, the LCST behavior of a mixture of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) triblock copolymers and phenolic resin oligomers is observed, and the corresponding phase transition is exploited to develop a facile route to hierarchically structured carbon monoliths. Whereas evaporation-induced self-assembly generates hexagonal channels in the monoliths, an additional phase transition at the LCST leads to an ordered arrangement of isolated pores. The fabrication method involves annealing the gel-phased mixture with polymeric microbeads in a 3D-structured mold at the LCST, followed by thermosetting and a carbonization process. The LCST phase transition behavior is observed experimentally by in situ small-angle X-ray scattering, optical transparency measurements, differential scanning calorimetry, and infrared spectroscopy. The fundamental mechanism of the LCST phase transition is further investigated by atomistic molecular dynamics simulations. English WILEY-V C H VERLAG GMBH RESORCINOL-FORMALDEHYDE BLOCK-COPOLYMERS SILICA SEPARATION POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS NETWORKS PORES RESIN WATER Preparation of Hierarchically Structured Amorphous Carbon Monoliths with Closed Spherical Mesopores via the Lower Critical Solution Temperature Phase Transition Article 10.1002/macp.201900165 1 MACROMOLECULAR CHEMISTRY AND PHYSICS, v.220, no.15 MACROMOLECULAR CHEMISTRY AND PHYSICS 220 15 scie scopus 000478745200015 2-s2.0-85068648682 Polymer Science Polymer Science Article RESORCINOL-FORMALDEHYDE BLOCK-COPOLYMERS SILICA SEPARATION POLY(N-ISOPROPYLACRYLAMIDE) HYDROGELS NETWORKS PORES RESIN WATER amorphous carbon block copolymer self-assembly closed mesopores hierarchical structures lower critical solution temperature phase transition