Nanoscopic fibrous assemblies made of metallophthalocyanine-terminated amphiphilic polymers.
Atom-transfer radical polymerization (ATRP) of acrylates from the initiator-modified zinc phthalocyanine yielded amphiphilic, phthalocyanine-terminated polymers with a narrow molecular-weight distribution. The disklike phthalocyanine moiety was incorporated into one end of the polymer chain. We investigated the aggregation behavior of phthalocyanine-terminated polymers in solution and in the solid state by using UV-visible, FT-IR, differential scanning calorimetry (DSC), and temperature-controlled powder X-ray diffraction (XRD) measurements. Amphiphilic phthalocaynine-terminated polymers that possess a poly[tri(ethylene glycol)methyl ether acrylate] chain aggregate in methanol to form a physical gel. Images from atomic force microscopy (AFM) and transmission electron microscopy (TEM) indicate that the physical gel contains a dense fibrous network structure, in which the zinc phthalocyanine groups were stacked into one-dimensional columnar aggregates through intermolecular pi-pi interactions between the pi-conjugated phthalocyanines and through van der Waals interaction of alkyl chains.
Kimura
Mutsumi
M
Department of Functional Polymer Science, Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan. mkimura@shinshu-u.ac.jp
Ueki
Hiroyuki
H
Ohta
Kazuchika
K
Hanabusa
Kenji
K
Shirai
Hirofusa
H
Kobayashi
Nagao
N