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A block copolymer nanotemplate for mechanically tunable polarized emission from a conjugated polymer |
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| Authors: | Tao Deng Craig Breen Thomas Breiner Edwin L Thomas |
| Affiliation: | a Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Building NE47, 4th Floor, Room 13-5094, 77 Massachusetts Avenue, Cambridge, MA 02139, USA b Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA c Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA |
| Abstract: | A polymer blend system consisting of polystyrene grafted onto poly (p-phenylene ethynylene) (PS-g-PPE) and poly (styrene-block-isoprene-block-styrene) triblock copolymer (SIS) yields highly polarized emission due to the unidirectional alignment of the PPE molecules. During the roll casting, the triblock copolymer microphase separates and creates unidirectionally aligned PS cylindrical microdomains in the rubbery PI matrix. PPE, a fluorescent conjugated polymer, was grafted with polystyrene (PS) side chains that enabled sequestration and alignment of these rigid backbone emitter molecules into the PS microdomains of the SIS triblock copolymer. Deforming the thermoplastic elastomer in a direction perpendicular to the orientation direction of the cylinders causes rotation of the PS cylinders and the PPE emitter molecules and affords tunable polarized emission due to re-orientation of the PPE containing PS cylinders as well as film thinning from Poisson effect. |
| Keywords: | Block copolymer Template Polarized emission |
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