Fioretto Daniele, Corezzi Silvia, Caponi Silvia, Scarponi Filippo, Monaco Giulio, Fontana Aldo, Palmieri Luciano
CNISM-Dipartimento di Fisica, Università di Perugia, via Pascoli, I-06123 Perugia, Italy.
J Chem Phys. 2008 Jun 7;128(21):214502. doi: 10.1063/1.2932105.
The Cauchy-like relation M(infinity) = A + BG(infinity) has recently been found to hold for the high frequency limit values of the longitudinal modulus M(infinity) and transverse modulus G(infinity) of viscoelastic liquids, with B approximately 3 in all the investigated systems. The Brillouin scattering results here reported for curing epoxy systems and thermal glass formers give evidence for the validity of a Cauchy-like relation M(') = A + BG(') for the real part of the elastic moduli measured at finite frequencies. Our results suggest as well the validity of a pure Cauchy relation DeltaM = 3 DeltaG for the relaxation strengths of longitudinal and shear moduli in relaxing liquids.
最近发现，对于粘弹性液体的纵向模量(M(\infty))和横向模量(G(\infty))的高频极限值，类似柯西的关系(M(\infty)=A + BG(\infty))成立，在所有研究的体系中(B)约为(3)。这里报道的关于固化环氧体系和热玻璃形成体的布里渊散射结果，为在有限频率下测量的弹性模量实部的类似柯西关系(M(')=A + BG('))的有效性提供了证据。我们的结果还表明，对于松弛液体中纵向模量和剪切模量的松弛强度，纯柯西关系(\Delta M = 3\Delta G)是有效的。
