10.1021/ma900351r.s001 Yasunari Tamai Yasunari Tamai Ryojun Sekine Ryojun Sekine Hiroyuki Aoki Hiroyuki Aoki Shinzaburo Ito Shinzaburo Ito Conformation of Single Homopolymer Chain in Microphase-Separated Block Copolymer Monolayer Studied by Scanning Near-Field Optical Microscopy American Chemical Society 2009 fluorescence intensity distribution interface Single Homopolymer Chain PiBMA domain SNOM methacrylate 2009-06-23 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Conformation_of_Single_Homopolymer_Chain_in_Microphase_Separated_Block_Copolymer_Monolayer_Studied_by_Scanning_Near_Field_Optical_Microscopy/2848315 The phase-separated structure of poly(isobutyl methacrylate)-<i>block</i>-poly(octadecyl methacrylate) (PiBMA-<i>b</i>-PODMA) monolayer and single poly(isobutyl methacrylate) (PiBMA) chain dispersed therein were investigated by scanning near-field optical microscopy (SNOM), which enabled us to observe with high spatial resolution beyond the diffraction limit of light. The conformation of the individual homo-PiBMA chains was quantitatively evaluated from the fluorescence intensity distribution. We found that the homo-PiBMA chains were almost located at the center of the PiBMA domain. The homo-PiBMA chain was oriented itself depending on its location in the PiBMA domain. When the homo-PiBMA chain locates at the center of the PiBMA domain, it tends to orient itself in the direction parallel to the interface between the two microdomains. When the homo-PiBMA chain locates near the interface, it orients itself in the direction perpendicular to the interface.