Rheology of Polymers

Vinogradov, G. V.; Malkin, A. Ya.

doi:10.1007/978-3-642-52204-8

Cited by 414 publications

(264 citation statements)

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“…On the other hand, more anisometric particles are more easily oriented in flow, which explains faster decrease in viscosity and storage modulus with increasing angular frequency. In other words, the rheological behaviour of MFC is typical of short fibre composites [54]. At the same time, the rather small difference in &* and G between undrawn blend and MFC is a result of certain presence of apparently anisometric PLA particles caused by flow in the extruder die [42].…”

Section: Effect Of Hnt and Drawing On Mechanical Propertiesmentioning

confidence: 95%

Effect of halloysite on structure and properties of melt-drawn PCL/PLA microfibrillar composites

Kelnar¹,

Kratochvíl²,

Fortelný³

et al. 2016

Express Polym. Lett.

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Abstract. The study deals with the modification of mechanical properties of poly (!-caprolactone) (PCL)/poly(lactic acid) (PLA) system using the microfibrillar composite (MFC) concept. As the in-situ formation of PLA fibrils by melt drawing was impossible due to flow instability during extrusion, the system was modified by adding halloysite nanotubes (HNT) using different mixing protocols. The resulting favourable effect on the rheological parameters of the components allowed successful melt drawing. Consequently, PLA fibrils formation combined with the reinforcement of components by HNT and increased PLA crystallinity lead to a biocompatible and biodegradable material with good performance suitable for a broad range of applications. The best results, comparable with analogous MFC modified with layered silicate (oMMT), have been achieved at a relatively low content of HNT of 3%, in spite of its lower reinforcing ability in a single nanocomposite. This indicates that modifying MFC by HNT, including fibrils and interface parameters, is more complex in comparison with the undrawn system.

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Section: Effect Of Hnt and Drawing On Mechanical Propertiesmentioning

confidence: 95%

Effect of halloysite on structure and properties of melt-drawn PCL/PLA microfibrillar composites

Kelnar¹,

Kratochvíl²,

Fortelný³

et al. 2016

Express Polym. Lett.

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“…Viscosity-temperature dependence for biological macromolecules solutions may be quantitatively described both by the Vogel-Tammann-Fulcher equation and by the modified Arrhenius formula [9]. In each case different parameters for a studied system can be obtained.…”

Section: Resultsmentioning

confidence: 99%

Determination of Some Hydrodynamic Parameters of Ovine Serum Albumin Solutions Using Viscometric Measurements

Monkos

2005

J Biol Phys

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Abstract. The influence of protein concentration and temperature on the viscosity of ovine serum albumin (OSA) solutions was studied. The Mooney equation and a modified Arrhenius formula were used to described the viscosity-concentration and viscosity-temperature dependence of the solutions, respectively. The effective specific volume, the activation energy and entropy of viscous flow for hydrated OSA were calculated. The axial ratio and the dimensions of the main semi-axes of hydrated OSA were established. At low concentration limit, the temperature dependence of the intrinsic viscosity and Huggins coefficient is presented. Comparison of some hydrodynamic parameters obtained for different proteins has been made.

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“…Consider the general linear anisotropic isothermal viscoelastic relations [29]- [75], which are the counterparts to Eqs. (2) ( )…”

Section: Viscoelastic Prs and Constitutive Relationsmentioning

confidence: 99%

Elastic and Viscoelastic Poisson’s Ratios: The Theoretical Mechanics Perspective

Hilton¹

2017

MSA

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A recent review publication presented an extensive and comprehensive assessment of the phenomenological relations of Poisson's ratios (PRs) to the behavior and responses of contemporary materials under specific loading conditions. The present review and analysis paper is intended as a theoretical mechanics complement covering mathematical and physical modeling of a single original elastic and of six time and process (i.e. path and stress) dependent viscoelastic PR definitions as well as a seventh special path independent one. The implications and consequences of such models on material characterization are analyzed and summarized. Indeed, PRs based on experimentally obtained 2-D strains under distinct creep and/or relaxation processes exhibit radically different time responses for identical material specimen. These results confirm the PR's implicit path dependence in addition to their separate intrinsic time reliance. Such non-uniqueness of viscoelastic PRs renders them unsuitable as universal material descriptors. Analytical formulations and experimental measurements also examine the physical impossibility of instantaneously achieving time independent loads or strains or their rates thus making certain PR definitions based on constant state variables, while mathematically valid, physically unrealistic and unachievable. A newly developed theoretical/experimental protocol for the determination of the time when loading patterns reach stead-state conditions based on strain accelerations demonstrates the capability to measure this time from experimental data. Due to the process dependent PRs, i.e. stress and stress history paths, the non-existence of a unique viscoelastic PR and of a universal elastic-viscoelastic correspondence principle or analogy (EVCP) in terms of PRs is demonstrated. Additionally and independently, the required double convolution integral construction of linear viscoelastic constitutive relations with the inclusion of PRs is cumbersome analytically and computationally needlessly highly CPU intensive. Furthermore, there is no theoretical fundamental hint as to what loading path is required to produce a unique universal viscoelastic PR definition necessary for formulating a PR based constitutive relation or an EVCP protocol. The analysis associated with an additional Class VII viscoelastic PR establishes it as a universal representation which is loading path and strain independent while still remaining time dependent. This Class PR can be the one used if it is desired to express constitutive relations in terms of PRs, subject to the caveat applying to all PR Classes regarding the CPU intensiveness in the time space due to triple product and double convolution integral constitutive relations. However, the use PRs is unnecessary since any set of material behavior can be uniquely and completely defined in terms of only moduli and/or compliances. The mathematical model of instantaneous initial loading paths, based on Heaviside functions, is examined in detail and shown to lead to infinite vel...

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Rheology of Polymers

Cited by 414 publications

References 0 publications

Effect of halloysite on structure and properties of melt-drawn PCL/PLA microfibrillar composites

Effect of halloysite on structure and properties of melt-drawn PCL/PLA microfibrillar composites

Determination of Some Hydrodynamic Parameters of Ovine Serum Albumin Solutions Using Viscometric Measurements

Elastic and Viscoelastic Poisson’s Ratios: The Theoretical Mechanics Perspective

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