title: perpendicular organization of macromolecules: synthesis and alignment studies of a soluble poly(iptycene).
abstract: We describe herein a polymeric material that prefers to align perpendicular to a stretch-aligned polymer host in the solid state. Poly(iptycene) poly-1 was synthesized from monomer 1 under hyperbaric techniques via a Diels-Alder polymerization. Polarized excitation spectra of the anthracene end groups in this material in a stretch-aligned, solution-cast poly(vinyl chloride) (PVC) film showed that the poly(iptycene) prefers to align normal (counter aspect ratio) to the stretching direction of the PVC. This is explained by a "threading" mechanism, whereby the PVC intercalates through the internal free volume presented by poly-1, similar to effects observed in small molecule iptycenes under similar conditions.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Samuel W
authors.initials: SW
authors.lastname: Thomas
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Long
authors.forename: Brian D
authors.initials: BD
authors.lastname: Pate
authors.forename: Steven R
authors.initials: SR
authors.lastname: Kline
authors.forename: Edwin L
authors.initials: EL
authors.lastname: Thomas
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Swager