TY - JOUR
T1 - Nanoporous, honeycomb-structured network fibers spun from semiflexible, ultrahigh molecular weight, disubstituted aromatic polyacetylenes
T2 - Superhierarchical structure and unique optical anisotropy
AU - Kwak, Giseop
AU - Fukao, Satoshi
AU - Fujiki, Michiya
AU - Sakaguchi, Toshikazu
AU - Masuda, Toshio
PY - 2006/11/14
Y1 - 2006/11/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33845247784&partnerID=8YFLogxK
U2 - 10.1021/cm061719u
DO - 10.1021/cm061719u
M3 - Article
AN - SCOPUS:33845247784
SN - 0897-4756
VL - 18
SP - 5537
EP - 5542
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 23
ER -