title: In situ TEM observation of phase transition of the nanoscopic patterns on baroplastic block copolymer films during nanoindentation.
abstract: We investigated the in situ phase transition of the nanoscopic patterns on block copolymer thin films during nanoindentation by using a transmission electron microscope (TEM) with a specially designed nanoindenter. For the first time, we observed directly an in situ phase transition from lamellar microdomains to disordered states during the nanoindentation on a baroplastic polystyrene-block-poly(n-pentyl methacrylate) copolymer (PS-b-PnPMA) film. Through the in situ TEM observation, the mechanism of the nanoscopic pattern formation on a block copolymer thin film by indentation is fully understood.
authors.affiliation: National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784, Republic of Korea.
authors.forename: Ara
authors.initials: A
authors.lastname: Jo
authors.forename: Gil Ho
authors.initials: GH
authors.lastname: Gu
authors.forename: Hong Chul
authors.initials: HC
authors.lastname: Moon
authors.forename: Sung Hyun
authors.initials: SH
authors.lastname: Han
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Oh
authors.forename: Chan Gyung
authors.initials: CG
authors.lastname: Park
authors.forename: Jin Kon
authors.initials: JK
authors.lastname: Kim