期刊
JOURNAL OF CHEMICAL PHYSICS
卷 129, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3000626
关键词
colloids; dielectric relaxation; liquid crystals; polymer melts; viscosity; vitrification
资金
- CLG NATO [CBP. NUKR. CLG 982312]
- Ministry of Science and Higher Education (Poland) [N202 147 32/4240]
Evidence for a possible general validity of the critical-like behavior of dielectric relaxation time or viscosity tau,eta proportional to(T-T-C)(-phi) with phi -> 9 and T-C < T-g on approaching glass temperature (T-g) is shown. This universal behavior is found in various systems where the vitrification is dominated by a selected element of symmetry. The supporting evidence was obtained on the basis of the distortion-sensitive, derivative-based analysis of tau(T) data for a rodlike liquid crystalline compound (E7), orientationally disordered crystals (plastic crystals), a colloidal nanofluid system, polymer melt (polystyrene), oligomeric liquid (EPON 828), and low molecular weight glass formers (glycerol, threitol, sorbitol, and 1-propanol). Results presented explain the puzzling experimental artifacts supporting the dynamical scaling model [R. H. Colby, Phys. Rev. E 61, 1783 (2000); B. M. Erwin, R. H. Colby, J. Non-Cryst. Solids 307-310, 225 (2002)]. It is suggested that spin-glass-like systems may be linked to the discussed pattern.
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