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Π‐Conjugated Helical Nano‐Columnar Polyacetylenes as Novel Color Controllable Materials
Author(s) -
Tabata Masayoshi,
Mawatari Yasuteru,
Sone Takeyuki,
Miyasaka Atsushi,
Kai Huang,
Orito Kazuhiko,
Sadahiro Yoshikazu
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690112
Subject(s) - polymer , crystallinity , materials science , raman spectroscopy , conjugated system , amorphous solid , norbornadiene , polymerization , methyl orange , side chain , polymer chemistry , triethylamine , crystallography , chemistry , organic chemistry , catalysis , composite material , optics , photocatalysis , physics
A series of p ‐ n ‐alkoxyphenylacetylenes (pROPA)s (R: C n H 2n+1 , n = 1, 2, 4, 6, 8, 10, 12, and 14) was polymerized with [Rh(norbornadiene)Cl] 2 catalyst in the presence of triethylamine to give stereoregular polyacetylenes, which colors of the resulting polymers were changed with increace of the carbon number of the alkyl side chains, i.e., yellow (n = 1∼6), orange (n = 8), red (n = 10), and dark red (n = 12, 14) along. Based on 1 H NMR and laser Raman spectra, it was found that the main chain of these polymers was cis‐forms. Wide‐angle X‐ray diffraction (XRD) analysis indicated that yellow polymers were almost amorphous. In the case of the orange polymer, crystallinity, i.e., columnar content, was increased. Red and dark red polymers consisted largely of the columnar. It was concluded that colors of these polymers were strongly correlated with their columnar content. Therefore, the columnar of these stereoregular polyacetylenes can be considered as helical self‐assembly π‐conjugated , i.e., color controllable material.