Nanoporous, honeycomb-structured network fibers spun from semiflexible, ultrahigh molecular weight, disubstituted aromatic polyacetylenes: Superhierarchical structure and unique optical anisotropy

Giseop Kwak, Satoshi Fukao, Michiya Fujiki, Toshikazu Sakaguchi, Toshio Masuda

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A diaryl-substituted polyacetylene, poly[1-(trimethylsilyl)phenyl-2- phenylacetylene] (PTMSDPA), provided nanoporous, honeycomb-structured network fibers by electrospinning the chloroform solution with about 1.6 wt % polymer. The PTMSDPA fibers formed a nanoporous, honeycomb-network structure. These fibers emitted an intense yellowish green light. The main axis of yellowish green emission in the fiber appeared to be perpendicular to the fiber axis. The polarization ratio (I/I) in fluorescence (FL) attained a value of ∼4.7 and the FL peak band of the perpendicular axis (λ max = 548 nm) was slightly red-shifted by 9 nm compared to that of the parallel one (λmax = 539 nm). The ultrahigh Mw of 8.0 × 105 and the relatively high α value of 0.765 were responsible for the lyotropic liquid crystallinity of PTMSDPA. The weak charge separation within the repeat unit of PTMSDPA was assumed to be responsible for the unique optical anisotropy of strong emission perpendicular to the fiber axis.

Original languageEnglish
Pages (from-to)5537-5542
Number of pages6
JournalChemistry of Materials
Volume18
Issue number23
DOIs
StatePublished - 14 Nov 2006

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