Dielectric Relaxation of Type-A Chains Undergoing Head-to-Tail Association/Dissociation: Difference from Head-to-Head Case and Correlation with Viscoelastic Relaxation
| Autor: | Youngdon Kwon, Yumi Matsumiya, Hiroshi Watanabe |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Head to head Dimer Organic Chemistry 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Viscoelasticity Dissociation (chemistry) 0104 chemical sciences Inorganic Chemistry Dipole chemistry.chemical_compound Reptation chemistry Normal mode Materials Chemistry 0210 nano-technology |
| Zdroj: | Macromolecules. 52:8484-8502 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.9b01710 |
| Popis: | Dielectric relaxation of type-A chains reflects global motion of the chains but is also affected by relative alignment of the dipoles along the chain backbone, namely, by the dipole inversion. Head-to-head association of type-A unimers gives a symmetrically dipole-inverted dimer, and the association/dissociation equilibrium of these unimers and dimer results in motional coupling of these chains, thereby affecting the dielectric behavior. In fact, for this head-to-head case, eigenmode analysis has been reported in the literature to reveal that motional coupling results in moderate retardation and acceleration of the dielectric relaxation of the unimer and dimer obeying the reptation dynamics. In contrast, the coupling has no effect on the dielectric relaxation of the Rouse unimer and dimer, namely, the effect of motional coupling on the dielectric relaxation changes with the type of chain dynamics. This effect was not clarified for head-to-tail associating unimers and their dimer having no dipole inversion... |
| Databáze: | OpenAIRE |
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