TY - JOUR
T1 - Chromatic transition of π-conjugated polydiacetylene and the subsequent aggregation phenomena
AU - Oikawa, Hidetoshi
AU - Korenaga, Tatsumi
AU - Okada, Shuji
AU - Nakanishi, Hachiro
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1999/10
Y1 - 1999/10
N2 - Static and dynamic light scattering from π-conjugated poly(4BCMU) in toluene solutions were measured at 353 K (yellow phase) and 323 K (red phase) to evaluate the hydrodynamic radius Rh and the fractal dimension D. It was suggested that poly(4BCMU) may exist not as an isolated worm-like chain but as a weakly interacted cluster-like domain in the yellow phase. The domain was considered to be elaborated by inter-molecular hydrogen bondings formed newly through a thermal break of intra-molecular hydrogen bondings between side chains along a main chain. On the other hand, the increases in Rh and D have revealed that poly(4BCMU) chains aggregated gradually in the red phase, after taking a single extended rod-like conformation. The subsequent aggregation seemed to be promoted not only by lowering a solvent quality but also by increasing the effective concentration, accompanied by the conformational transition.
AB - Static and dynamic light scattering from π-conjugated poly(4BCMU) in toluene solutions were measured at 353 K (yellow phase) and 323 K (red phase) to evaluate the hydrodynamic radius Rh and the fractal dimension D. It was suggested that poly(4BCMU) may exist not as an isolated worm-like chain but as a weakly interacted cluster-like domain in the yellow phase. The domain was considered to be elaborated by inter-molecular hydrogen bondings formed newly through a thermal break of intra-molecular hydrogen bondings between side chains along a main chain. On the other hand, the increases in Rh and D have revealed that poly(4BCMU) chains aggregated gradually in the red phase, after taking a single extended rod-like conformation. The subsequent aggregation seemed to be promoted not only by lowering a solvent quality but also by increasing the effective concentration, accompanied by the conformational transition.
KW - Chromatic transition
KW - Dynamic light scattering
KW - Polydiacetylene
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U2 - 10.1016/S0032-3861(98)00823-4
DO - 10.1016/S0032-3861(98)00823-4
M3 - Article
AN - SCOPUS:0032845219
VL - 40
SP - 5993
EP - 6001
JO - Polymer (United Kingdom)
JF - Polymer (United Kingdom)
SN - 0032-3861
IS - 22
ER -